HackSkills is an organized knowledge base of installable skills that gives AI agents practical security knowledge across areas such as web security, privilege escalation, reverse engineering, and digital forensics. It is intended for bug bounty work, penetration testing, CTF competitions, and authorized security research. The catalogue entries are the project's own master, category, and topic skills.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add yaklang/hack-skills --skill active-directory-kerberos-attacksgit clone --depth 1 https://github.com/yaklang/hack-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/yaklang/hack-skills/active-directory-kerberos-attacks)<a href="https://agentmods.dev/skills/yaklang/hack-skills/active-directory-kerberos-attacks"><img src="https://agentmods.dev/badge/skills/yaklang/hack-skills/active-directory-kerberos-attacks.svg" alt="Measured on agentmods" height="20"></a>- Socket warn
- Snyk fail
- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high YARA Match · line 54 YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).Fix: Remove offensive tool references and exploit code. Legitimate agent skills should not contain penetration testing tools, exploit frameworks, or reconnaissance utilities.
- high YARA Match · line 123 YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).Fix: Remove the malware payload or compromised file entirely. Investigate how it entered the skill and audit all other artifacts for additional indicators of compromise.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00048 | $0.02929 |
| Opus 5 | $0.00024 | $0.01465 |
| Sonnet 5 | $0.00010 | $0.00586 |
| Haiku 4.5 | $0.00005 | $0.00293 |
Grade A, and why
active-directory-kerberos-attacks scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
4 near-identical copies found in the catalogue:
- active-directory-kerberos-attacks — 100% identical, 0 lines differ
- active-directory-kerberos-attacks — 100% identical, 0 lines differ
- active-directory-kerberos-attacks — 100% identical, 0 lines differ
- active-directory-kerberos-attacks — 97% identical, 4 lines differ
How it starts
The opening of the file, as written. The whole thing — 312 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: Kerberos Attack Playbook — Expert AD Attack Guide
AI LOAD INSTRUCTION: Expert Kerberos attack techniques for AD environments. Covers AS-REP roasting, Kerberoasting, golden/silver/diamond/sapphire tickets, delegation attacks, pass-the-ticket, and overpass-the-hash. Base models miss ticket type distinctions, delegation chain nuances, and detection-evasion trade-offs.
0. RELATED ROUTING
Before going deep, consider loading:
- active-directory-acl-abuse for ACL-based AD attacks often chained with Kerberos
- active-directory-certificate-services for ADCS-based persistence (golden certificate)
- ntlm-relay-coercion for NTLM relay attacks that complement Kerberos abuse
- windows-lateral-movement after obtaining tickets for lateral movement
Advanced Reference
Also load KERBEROS_ATTACK_CHAINS.md when you need:
- Multi-step attack chains combining Kerberos with ACL abuse, ADCS, and relay
- End-to-end scenarios from foothold to domain admin
- Chained delegation attack flows
1. KERBEROS AUTHENTICATION PRIMER
Client KDC (DC) Service
│ │ │
│── AS-REQ ────────→│ │ (1) Request TGT with user creds
│←─ AS-REP ─────────│ │ (2) Receive TGT (encrypted with krbtgt hash)
│ │ │
│── TGS-REQ ───────→│ │ (3) Present TGT, request service ticket
│←─ TGS-REP ────────│ │ (4) Receive TGS (encrypted with service hash)
│ │ │
│── AP-REQ ─────────────────────────────→│ (5) Present TGS to service
│←─ AP-REP ──────────────────────────────│ (6) Mutual auth (optional)
2. AS-REP ROASTING
Users with "Do not require Kerberos preauthentication" can be queried for AS-REP without knowing their password.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 312 lines · 48 tokens per session scan A a9812725edef
active-directory-kerberos-attacks is a skill published in the GitHub repository yaklang/hack-skills (2,133 stars, last pushed 2mo ago), licensed MIT. It adds 48 tokens to every session and 2,929 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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