Detecting Golden Ticket Forgery

Overview

A Golden Ticket attack (MITRE ATT&CK T1558.001) involves forging a Kerberos Ticket Granting Ticket (TGT) using the krbtgt account NTLM hash, granting unrestricted access to any service in the Active Directory domain. This skill detects Golden Ticket usage by analyzing Event ID 4769 for RC4 encryption type (0x17) in environments enforcing AES, identifying tickets with abnormal lifetimes exceeding domain policy, correlating TGS requests with missing corresponding TGT requests (Event ID 4768), and detecting krbtgt password age anomalies.

Prerequisites

• Windows Domain Controller with Kerberos audit logging enabled
• Splunk or Elastic SIEM ingesting Windows Security event logs
• Python 3.8+ for offline event log analysis
• Knowledge of domain Kerberos encryption policy (AES vs RC4)

Steps

1. Audit domain Kerberos encryption policy to establish AES-only baseline
2. Forward Event IDs 4768 and 4769 to SIEM platform
3. Detect RC4 (0x17) encryption in TGS requests where AES is enforced
4. Identify TGS requests without corresponding TGT requests (forged ticket indicator)
5. Alert on ticket lifetimes exceeding MaxTicketAge domain policy
6. Monitor krbtgt account password age and last reset date
7. Correlate findings with host/user context for risk scoring

Expected Output

JSON report with Golden Ticket indicators including RC4 downgrades, orphaned TGS requests, abnormal ticket lifetimes, and risk-scored alerts with MITRE ATT&CK technique mapping.