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Active Directory (AD) and Domain Controllers (DC) are prime targets for attackers, yet default configurations often fail to detect advanced threats like BadSuccessor. This article dives into detection techniques, KQL queries for threat hunting, and hardening steps.
You Should Know:
1. Understanding BadSuccessor Attacks
BadSuccessor exploits AD trust relationships or delegation misconfigurations to escalate privileges stealthily. Default logging often misses these activities.
2. Enable Advanced Auditing
Turn on Audit Kerberos Authentication Service and Audit Kerberos Service Ticket Operations in Group Policy:
Enable via GPO or local policy auditpol /set /subcategory:"Kerberos Authentication Service" /success:enable /failure:enable auditpol /set /subcategory:"Kerberos Service Ticket Operations" /success:enable /failure:enable
3. KQL Query for Suspicious TGT Requests
Use this Kusto Query Language (KQL) in Azure Sentinel/Microsoft Defender to detect anomalous Ticket Granting Ticket (TGT) requests:
SecurityEvent | where EventID == 4768 // Kerberos TGT request | where Status == "0x0" // Successful request | where TicketEncryptionType == "0x17" // RC4 encryption (often abused) | summarize count() by Account, ClientAddress | where count_ > 5 // Threshold for investigation
4. Hunting for Golden Ticket Usage
Check for forged tickets using Event ID 4769 (Kerberos Service Ticket Operations):
SecurityEvent | where EventID == 4769 | where TicketEncryptionType == "0x17" | where ServiceName != "krbtgt" // Filter non-standard service tickets | project TimeGenerated, Account, ClientAddress, ServiceName
5. Detecting DCShadow Attacks
Attackers may use DCShadow to manipulate AD objects. Monitor for unusual replication requests:
Get-WinEvent -LogName "Directory Service" -FilterXPath "[System[EventID=4929]]"
6. Mitigation Steps
- Disable RC4 in Kerberos encryption:
Set-ADAccountControl -Identity <User> -KerberosEncryptionType AES256
- Monitor Sensitive Group Changes:
SecurityEvent | where EventID == 4732 // Member added to security-enabled group | where TargetAccount == "Domain Admins"
What Undercode Say:
Default AD configurations are insufficient against advanced attacks like BadSuccessor. Proactive monitoring with KQL, disabling weak encryption, and auditing Kerberos events are critical. Organizations must:
– Enable extended logging
– Hunt for ticket anomalies
– Restrict Tier-0 access
Prediction:
As attackers evolve, AD persistence techniques will grow more sophisticated. Expect increased abuse of delegation trusts and cloud-integrated AD attacks.
Expected Output:
- Detected anomalous TGT requests
- Identified RC4-based ticket forging
- Monitored unauthorized group modifications
Relevant URLs:
( extended with verified commands and detection strategies.)
IT/Security Reporter URL:
Reported By: Mehmetergene Badsuccessor – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
