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Agent skill

Performing Kerberoasting Attack

by mukul975 in mukul975/Anthropic-Cybersecurity-Skills

Perform Kerberoasting, a post-exploitation technique that enumerates Active Directory service accounts with Service Principal Names (SPNs), requests their Kerberos TGS tickets, and cracks the…

Apache-2.0Auto-check passedSecurity

Install Performing Kerberoasting Attack

skills CLI
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill performing-kerberoasting-attack -a claude-code

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

GitHub CLI
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills performing-kerberoasting-attack --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/performing-kerberoasting-attack .claude/skills/performing-kerberoasting-attack && 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
performing-kerberoasting-attack
GitHub stars
34k
Token cost
~1.1k tokens
SKILL.md length
451 words
Files
8 (incl. scripts, references, assets)
Skills in repo
644
Repo updated
First seen
Licence
Apache-2.0

At a glance

Perform Kerberoasting, a post-exploitation technique that enumerates Active Directory service accounts with Service Principal Names (SPNs), requests their Kerberos TGS tickets, and cracks the…

  • Works in 4 steps: SPN Enumeration → TGS Ticket Request → Offline Cracking → …
  • Tasks that involve Red teaming and adversary simulation
  • SKILL.md covers Overview, When to Use, Prerequisites and MITRE ATT&CK Mapping, plus 4 more sections
  • Runs Python scripts from its folder

What it does

Performing Kerberoasting Attack is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Perform Kerberoasting, a post-exploitation technique that enumerates Active Directory service accounts with Service Principal Names (SPNs), requests their Kerberos TGS tickets, and cracks the NTLM-encrypted tickets offline to recover service account credentials. Use during authorized red team engagements or penetration tests to assess AD privilege escalation and credential access risk from weak service account passwords.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts, reference files and assets (for example `assets/template.md`, `references/api-reference.md` and `references/standards.md`).

It sits in Security, covering Red teaming and adversary simulation. 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

  • Tasks that involve Red teaming and adversary simulation

Example prompts

  • “/performing-kerberoasting-attack”

Requirements

  • Python 3

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. SPN Enumeration
  2. TGS Ticket Request
  3. Offline Cracking
  4. Credential Validation

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 2 files 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

Performing Kerberoasting Attack loads about 1.1k tokens when it runs, and up to ~3.4k if it reads all its reference files. Until then it costs about 114 tokens; SKILL.md has 451 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~114
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.4k

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). 451 words, ~1,121 tokens.

Download SKILL.mdSave it as .claude/skills/performing-kerberoasting-attack/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.
name
performing-kerberoasting-attack
description
Perform Kerberoasting, a post-exploitation technique that enumerates Active Directory service accounts with Service Principal Names (SPNs), requests their Kerberos TGS tickets, and cracks the NTLM-encrypted tickets offline to recover service account credentials. Use during authorized red team engagements or penetration tests to assess AD privilege escalation and credential access risk from weak service account passwords.
domain
cybersecurity
subdomain
red-teaming
tags
red-team, adversary-simulation, mitre-attack, exploitation, post-exploitation, kerberoasting, active-directory, credential-access
version
1.0
author
mahipal
license
Apache-2.0
d3fend_techniques
Application Protocol Command Analysis, Network Isolation, Network Traffic Analysis, Client-server Payload Profiling, Network Traffic Community Deviation
nist_csf
ID.RA-01, GV.OV-02, DE.AE-07
mitre_attack
T1595, T1190, T1059, T1078, T1003

Performing Kerberoasting Attack

Legal Notice: This skill is for authorized security testing and educational purposes only. Unauthorized use against systems you do not own or have written permission to test is illegal and may violate computer fraud laws.

Overview

Kerberoasting is a post-exploitation technique that targets service accounts in Active Directory by requesting Kerberos TGS (Ticket Granting Service) tickets for accounts with Service Principal Names (SPNs) set. These tickets are encrypted with the service account's NTLM hash, allowing offline brute-force cracking without generating failed login events. It is one of the most common privilege escalation paths in AD environments because any domain user can request TGS tickets.

When to Use

  • When conducting security assessments that involve performing kerberoasting attack
  • When following incident response procedures for related security events
  • When performing scheduled security testing or auditing activities
  • When validating security controls through hands-on testing

Prerequisites

  • Familiarity with red teaming concepts and tools
  • Access to a test or lab environment for safe execution
  • Python 3.8+ with required dependencies installed
  • Appropriate authorization for any testing activities

MITRE ATT&CK Mapping

  • T1558.003 - Steal or Forge Kerberos Tickets: Kerberoasting
  • T1087.002 - Account Discovery: Domain Account
  • T1069.002 - Permission Groups Discovery: Domain Groups

Workflow

Phase 1: SPN Enumeration
  1. Enumerate accounts with SPNs using LDAP queries
  2. Filter for user accounts (not computer accounts)
  3. Identify accounts with elevated privileges (adminCount=1)
  4. Prioritize accounts with weak password policies
Phase 2: TGS Ticket Request
  1. Request TGS tickets for identified SPN accounts
  2. Extract ticket data in crackable format (hashcat/john compatible)
  3. Ensure RC4 encryption is requested when possible (easier to crack)
  4. Document all requested tickets
Show full SKILL.md (184 more words)Show less
Phase 3: Offline Cracking
  1. Use hashcat mode 13100 (Kerberos 5 TGS-REP etype 23) for RC4 tickets
  2. Use hashcat mode 19700 (Kerberos 5 TGS-REP etype 17) for AES-128
  3. Use hashcat mode 19800 (Kerberos 5 TGS-REP etype 18) for AES-256
  4. Apply targeted wordlists and rules based on password policy
Phase 4: Credential Validation
  1. Validate cracked credentials against domain
  2. Assess access level of compromised accounts
  3. Map accounts to BloodHound attack paths
  4. Document for engagement report

Tools and Resources

ToolPurposePlatform
RubeusKerberoasting and ticket manipulationWindows (.NET)
Impacket GetUserSPNs.pyRemote KerberoastingLinux/Python
PowerViewSPN enumerationWindows (PowerShell)
hashcatOffline password crackingCross-platform
John the RipperOffline password crackingCross-platform

Detection Indicators

  • Event ID 4769: Kerberos Service Ticket Request with RC4 encryption (0x17)
  • Anomalous TGS requests from a single account in short timeframe
  • TGS requests for services the user normally does not access
  • Honeypot SPN accounts with alerting on ticket requests

Validation Criteria

  • SPN accounts enumerated and documented
  • TGS tickets extracted in crackable format
  • Offline cracking attempted with appropriate wordlists
  • Cracked credentials validated
  • Access level of compromised accounts assessed

© 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 7 other files (scripts, references, assets) in skills/performing-kerberoasting-attack of mukul975/Anthropic-Cybersecurity-Skills.

  • SKILL.md
  • LICENSE
  • assets/template.md
  • references/api-reference.md
  • references/standards.md
  • references/workflows.md
  • scripts/agent.py
  • scripts/process.py

Open the folder on GitHubat commit 54a7988

Compare with similar skills

Performing Kerberoasting Attack 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.

Performing Kerberoasting Attack compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Performing Kerberoasting Attack this skillmukul975/Anthropic-Cybersecurity-Skills34k—~1.1kAutomated safety check: PassApache-2.0
Authorization Bypass DetectionTencent/AI-Infra-Guard6.8k—~753Automated safety check: PassApache-2.0
Run Assert Evalresponsibleai/ASSERT330—~11kAutomated safety check: NotesMIT
Osint Methodologyelementalsouls/Claude-OSINT2.8k—~8.7kAutomated safety check: NotesMIT
Lfd Designelvisun/loss-function-development176—~2.9kAutomated safety check: NotesMIT
Acl AbuseADScanPro/Claude-AD211—~2.6kAutomated safety check: PassMIT

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Categories

Questions about Performing Kerberoasting Attack

What does Performing Kerberoasting Attack do?

Perform Kerberoasting, a post-exploitation technique that enumerates Active Directory service accounts with Service Principal Names (SPNs), requests their Kerberos TGS tickets, and cracks the…. Performing Kerberoasting Attack is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Perform Kerberoasting, a post-exploitation technique that enumerates Active Directory service accounts with Service Principal Names (SPNs), requests their Kerberos TGS tickets, and cracks the NTLM-encrypted tickets offline to recover service account credentials.

When should I use Performing Kerberoasting Attack?

Performing Kerberoasting Attack fits situations like: tasks that involve Red teaming and adversary simulation.

How do I install Performing Kerberoasting Attack in Claude Code?

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

How do I install Performing Kerberoasting Attack in Codex?

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

Can I use Performing Kerberoasting Attack 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 performing-kerberoasting-attack -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/performing-kerberoasting-attack, .gemini/skills/performing-kerberoasting-attack, .github/skills/performing-kerberoasting-attack and .opencode/skills/performing-kerberoasting-attack in your project.

What does Performing Kerberoasting Attack need to run?

Going by SKILL.md and its folder, Performing Kerberoasting Attack needs Python for the scripts in its folder. Our summary lists: Python 3.

Does Performing Kerberoasting Attack 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 Performing Kerberoasting Attack 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 Performing Kerberoasting Attack use?

Performing Kerberoasting Attack 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 Performing Kerberoasting Attack use?

About 1.1k tokens (SKILL.md is roughly 4.5k 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 2.2k tokens, read only when the agent opens those files.

What are the alternatives to Performing Kerberoasting Attack?

Skills that share tags, products or a category with Performing Kerberoasting Attack: Authorization Bypass Detection (Tencent/AI-Infra-Guard, 6.8k stars), Run Assert Eval (responsibleai/ASSERT, 330 stars), Osint Methodology (elementalsouls/Claude-OSINT, 2.8k stars) and Lfd Design (elvisun/loss-function-development, 176 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Performing Kerberoasting Attack?

mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 33,993 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.