About

Imported from mukul975/anthropic-cybersecurity-skills (skills/detecting-golden-ticket-forgery/SKILL.md). Install upstream with npx skills add mukul975/anthropic-cybersecurity-skills --skill detecting-golden-ticket-forgery. Copyright stays with the author (Apache-2.0).

Detecting Golden Ticket Forgery

Name: detecting-golden-ticket-forgery
Author: mukul975

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

Audit domain Kerberos encryption policy to establish AES-only baseline
Forward Event IDs 4768 and 4769 to SIEM platform
Detect RC4 (0x17) encryption in TGS requests where AES is enforced
Identify TGS requests without corresponding TGT requests (forged ticket indicator)
Alert on ticket lifetimes exceeding MaxTicketAge domain policy
Monitor krbtgt account password age and last reset date
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.

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/mukul975-anthropic-cybersecurity-skills-detecting-golden-9979f6/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

mukul975-anthropic-cybersecurity-skills-detecting-golden-9979f6.ocm.jsonjson

{
  "ocm": "1",
  "id": "mukul975-anthropic-cybersecurity-skills-detecting-golden-9979f6",
  "kind": "skill",
  "name": "detecting-golden-ticket-forgery",
  "description": "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.",
  "publisher": "mukul975",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "customer_support"
    ],
    "tags": [
      "skill-md",
      "golden-ticket",
      "kerberos",
      "active-directory",
      "mimikatz",
      "splunk",
      "credential-theft",
      "windows-security",
      "skills-sh"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "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."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "skills.sh",
      "repository": "https://github.com/mukul975/anthropic-cybersecurity-skills",
      "path": "skills/detecting-golden-ticket-forgery/SKILL.md",
      "ref": "HEAD",
      "url": "https://github.com/mukul975/anthropic-cybersecurity-skills/blob/HEAD/skills/detecting-golden-ticket-forgery/SKILL.md",
      "key": "mukul975/anthropic-cybersecurity-skills/skills/detecting-golden-ticket-forgery/SKILL.md"
    },
    "license": "Apache-2.0"
  },
  "instructions": "# Detecting Golden Ticket Forgery\n\n## Overview\n\nA 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.\n\n\n## When t",
  "cost": {
    "context_tokens": 461
  }
}

Fetch it by URL: GET /api/v1/registry/mukul975-anthropic-cybersecurity-skills-detecting-golden-9979f6/manifest?version=1.0.0

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