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Agent skill

Detecting Golden Ticket Forgery

by mukul975 in mukul975/Anthropic-Cybersecurity-Skills

Detect Kerberos Golden Ticket forgery (e.g. An agent skill from mukul975/Anthropic-Cybersecurity-Skills.

Apache-2.0Auto-check passedSecurity

Install Detecting Golden Ticket Forgery

skills CLI
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-golden-ticket-forgery -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills detecting-golden-ticket-forgery --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/detecting-golden-ticket-forgery .claude/skills/detecting-golden-ticket-forgery && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
detecting-golden-ticket-forgery
GitHub stars
34k
Token cost
~677 tokens
SKILL.md length
256 words
Files
4 (incl. scripts, references)
Skills in repo
644
Repo updated
First seen
Licence
Apache-2.0

At a glance

Detect Kerberos Golden Ticket forgery (e.g. An agent skill from mukul975/Anthropic-Cybersecurity-Skills.

  • Works in 7 steps: Audit domain Kerberos encryption policy… → Forward Event IDs 4768 and 4769 to SIEM… → Detect RC4 (0x17) encryption in TGS… → …
  • Investigating suspected forged Kerberos tickets
  • SKILL.md covers Overview, When to Use, Prerequisites and Steps, plus 1 more section
  • Runs Python scripts from its folder

What it does

Detecting Golden Ticket Forgery is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. 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.

Its SKILL.md is about 680 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts and reference files (for example `references/api-reference.md` and `scripts/agent.py`).

It sits in Security, covering Security operations and Red teaming and adversary simulation. It works with Splunk. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.

When your agent uses it

  • Investigating suspected forged Kerberos tickets
  • Krbtgt credential theft in Active Directory

Example prompts

  • “/detecting-golden-ticket-forgery”

Requirements

  • Python 3

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  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

What it can do on your machine

Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/ (Python), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Detecting Golden Ticket Forgery loads about 677 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 93 tokens; SKILL.md has 256 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~93
When it runs · the whole SKILL.md, loaded when a task matches
~677
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 256 words, ~677 tokens.

Download SKILL.mdSave it as .claude/skills/detecting-golden-ticket-forgery/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
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.
domain
cybersecurity
subdomain
threat-detection
tags
golden-ticket, kerberos, active-directory, mimikatz, splunk, credential-theft, windows-security
version
1.0
author
mahipal
license
Apache-2.0
d3fend_techniques
Token Binding, Restore Access, Reissue Credential, Decoy User Credential, Authentication Cache Invalidation
nist_csf
DE.CM-01, DE.AE-02, DE.AE-06, ID.RA-05
mitre_attack
T1078, T1190, T1059, T1003, T1110

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.

© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (scripts, references) in skills/detecting-golden-ticket-forgery of mukul975/Anthropic-Cybersecurity-Skills.

  • SKILL.md
  • LICENSE
  • references/api-reference.md
  • scripts/agent.py

Open the folder on GitHubat commit 54a7988

Compare with similar skills

Detecting Golden Ticket Forgery next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Detecting Golden Ticket Forgery compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Detecting Golden Ticket Forgery this skillmukul975/Anthropic-Cybersecurity-Skills34k—~677Automated safety check: PassApache-2.0
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Cybersecurityohmyjahh/xquads-squads277—~895Automated safety check: PassMIT
Rational Red Blue Debatedigoal/blog8.6k—~2.2kAutomated safety check: PassGPL-2.0
Secops Investigategoogle/skills21k1 repos~4.2kAutomated safety check: PassApache-2.0
Detection SigmaAgentSecOps/SecOpsAgentKit2201 repos~4kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about Detecting Golden Ticket Forgery

What does Detecting Golden Ticket Forgery do?

Detect Kerberos Golden Ticket forgery (e.g. An agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detecting Golden Ticket Forgery is an agent skill from mukul975/Anthropic-Cybersecurity-Skills.g.

When should I use Detecting Golden Ticket Forgery?

Detecting Golden Ticket Forgery fits situations like: investigating suspected forged Kerberos tickets; krbtgt credential theft in Active Directory.

How do I install Detecting Golden Ticket Forgery in Claude Code?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-golden-ticket-forgery -a claude-code`. Or copy the skill folder (skills/detecting-golden-ticket-forgery in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/detecting-golden-ticket-forgery in your project. Claude Code loads it when a task matches its description.

How do I install Detecting Golden Ticket Forgery in Codex?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-golden-ticket-forgery -a codex`. Or copy the skill folder (skills/detecting-golden-ticket-forgery in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/detecting-golden-ticket-forgery in your project. Codex loads it when a task matches its description.

Can I use Detecting Golden Ticket Forgery in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-golden-ticket-forgery -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/detecting-golden-ticket-forgery, .gemini/skills/detecting-golden-ticket-forgery, .github/skills/detecting-golden-ticket-forgery and .opencode/skills/detecting-golden-ticket-forgery in your project.

What does Detecting Golden Ticket Forgery need to run?

Going by SKILL.md and its folder, Detecting Golden Ticket Forgery needs Python for the scripts in its folder. Our summary lists: Python 3.

Does Detecting Golden Ticket Forgery access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Detecting Golden Ticket Forgery safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Detecting Golden Ticket Forgery use?

Detecting Golden Ticket Forgery is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Detecting Golden Ticket Forgery use?

About 677 tokens (SKILL.md is roughly 2.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 586 tokens, read only when the agent opens those files.

What are the alternatives to Detecting Golden Ticket Forgery?

Skills that share tags, products or a category with Detecting Golden Ticket Forgery: Council (warpdotdev/common-skills, 610 stars), Cybersecurity (ohmyjahh/xquads-squads, 277 stars), Rational Red Blue Debate (digoal/blog, 8.6k stars) and Secops Investigate (google/skills, 21k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Detecting Golden Ticket Forgery?

mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 34,116 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.

Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.