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Introduction:
Active Directory (AD) remains a prime target for attackers due to its central role in enterprise authentication. In this guide, we dissect Tyler Ramsbey’s walkthrough of Vulnlab’s “Trusted” AD chain, where compromising two domain controllers (DCs) is key. We’ll explore essential techniques, commands, and mitigations to sharpen your red and blue team skills.
Learning Objectives:
- Understand common AD exploitation techniques.
- Learn step-by-step privilege escalation methods.
- Apply defensive measures to secure AD environments.
You Should Know:
1. Enumerating Active Directory with PowerView
Command:
Get-NetUser | Select-Object samaccountname, description, lastlogon
What It Does:
This PowerView command retrieves user accounts, descriptions, and last logon timestamps—critical for identifying stale or misconfigured accounts.
Step-by-Step:
1. Import PowerView:
Import-Module .\PowerView.ps1
2. Run the command to list users and analyze weak credentials.
2. Exploiting Kerberoasting for Service Account Hashes
Command:
GetUserSPNs.py -request -dc-ip <DC_IP> DOMAIN/user
What It Does:
Requests Service Principal Names (SPNs) and extracts crackable Kerberos tickets (TGS-REPs).
Step-by-Step:
1. Use Impacket’s `GetUserSPNs.py` to list SPNs.
2. Export hashes and crack them with Hashcat:
hashcat -m 13100 hashes.txt rockyou.txt
3. Lateral Movement via Pass-the-Hash (PtH)
Command:
psexec.py DOMAIN/user@TARGET_IP -hashes LMHASH:NTHASH
What It Does:
Executes commands on a remote host using NTLM hashes.
Step-by-Step:
1. Dump hashes with Mimikatz or SecretsDump.py.
2. Use Impacket’s `psexec.py` to gain a shell.
4. Privilege Escalation with DCSync
Command (Mimikatz):
lsadump::dcsync /user:DOMAIN\krbtgt
What It Does:
Extracts password hashes for the KRBTGT account, enabling Golden Ticket attacks.
Step-by-Step:
1. Gain Domain Admin rights.
2. Run Mimikatz to pull KRBTGT hashes.
5. Defending Against AD Attacks
Mitigation Command (Windows):
Set-ADAccountControl -Identity User -CannotChangePassword $true
What It Does:
Restricts password changes for sensitive accounts.
Step-by-Step:
1. Audit privileged accounts.
- Enforce strong password policies and monitor for anomalous logins.
What Undercode Say:
- Key Takeaway 1: AD exploitation often hinges on misconfigurations like excessive permissions or weak service accounts.
- Key Takeaway 2: Defenders must monitor Kerberos logs (Event ID 4769) and enforce least privilege.
Analysis:
The “Trusted” chain highlights how attackers pivot between DCs using credential theft and lateral movement. Organizations should segment networks, disable unnecessary services, and deploy Endpoint Detection and Response (EDR) solutions.
Prediction:
As AI-driven offensive tools evolve, AD attacks will become more automated. Defenders must adopt AI-powered threat-hunting tools to stay ahead.
References:
IT/Security Reporter URL:
Reported By: Tyler Ramsbey – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
