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detecting-golden-ticket-forgery

Investigate forged Kerberos authentication tickets in Active Directory by checking Windows logs for unusual encryption, excessive ticket lifetimes, and missing authentication requests. Produce a JSON report of suspicious indicators with risk ratings.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

원문원문 설명 보기

Detect Kerberos Golden Ticket forgery (e.g. Mimikatz-forged tickets) by analyzing Windows Event ID 4769 for RC4 encryption downgrades (0x17), abnormal ticket lifetimes, and krbtgt account anomalies using Splunk and Elastic SIEM queries. Use when investigating suspected forged Kerberos tickets or krbtgt credential theft in Active Directory.

실행 점수 미검증

설치 방법 보기

이럴 때 유용합니다

  • Investigating suspected forged authentication tickets
  • Checking for possible krbtgt credential theft
  • Building detection rules from authentication logs
  • Reviewing monitoring coverage for Golden Ticket attacks

포함된 파일(4)

  • SKILL.md2.6 KB
  • LICENSE11.0 KB
  • references/api-reference.md2.3 KB
  • scripts/agent.py8.3 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

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.

When to Use

  • When investigating security incidents that require detecting golden ticket forgery
  • When building detection rules or threat hunting queries for this domain
  • When SOC analysts need structured procedures for this analysis type
  • When validating security monitoring coverage for related attack techniques

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.

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