# Detecting Golden Ticket Forgery

> Use when detect Kerberos Golden Ticket forgery by analyzing Windows Event ID 4769 for RC4 encryption downgrades (0x17), abnormal ticket lifetimes, and krbtgt account anomalies in Splunk and Elastic SIEM. Use when detecting kerberos golden ticket forgery by analyzing windows event id.

- Skill: `oyi77/detecting-golden-ticket-forgery` (Agent Skill)
- Install (CLI): `npx skillmds add oyi77/detecting-golden-ticket-forgery`
- Raw SKILL.md: https://api.skillmd.com/api/skills/oyi77/detecting-golden-ticket-forgery/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: Apache-2.0
- Author: oyi77 (https://skillmd.com/u/oyi77)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/oyi77/detecting-golden-ticket-forgery

---



# 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
**Trigger phrases:**
- "detecting golden ticket forgery"
- "Detect Kerberos Golden Ticket forgery by analyzing Windows Event ID 4769 for RC4"


- 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


## When NOT to Use

- When you lack proper authorization for testing
- For production systems without change management
- When the task requires legal or compliance expertise beyond technical scope


## 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

```python
# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text) for k, v in IOC_PATTERNS.items()}
```

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.
## Red Flags

- Performing actions without explicit written authorization from the asset owner
- Testing against production systems without a defined scope and rules of engagement
- Sharing sensitive findings or credentials in unencrypted communications
- Failing to properly scope and contain the assessment before starting

## Process

1. **Reconnaissance** — Gather target information, identify attack surface, enumerate services
1. **Analysis/Exploitation** — Execute the technique, analyze results, document findings
1. **Reporting** — Document IOCs, write findings, provide remediation recommendations

## Verification

- All steps executed successfully against a test environment before production use
- Output documented with screenshots or logs demonstrating expected behavior
- Results validated against known-good baselines or reference implementations
- Documentation complete enough for another analyst to reproduce findings

## Anti-Rationalization Table

| Rationalization | Reality |
|---|---|
| "We are too small to be targeted" | Automated attacks target everyone. Size does not matter. |
| "Security slows us down" | A breach slows you down 100x more. Build security in from the start. |
| "We will fix it after launch" | Vulnerabilities in production are exploited within hours. Fix before deploy. |