Reverse Skill is a routing package for AI coding agents that selects appropriate reverse-engineering, penetration-testing, and security-research methods and tools for a given target. It is used for tasks involving APKs, binaries, frontend JavaScript, packet captures, CTF challenges, and authorized penetration testing. Its catalogue add-ons provide the skills and instructions that guide these workflows.
Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/zhaoxuya520/reverse-skillnpx agentmods add skills/zhaoxuya520/reverse-skill/competition-zip-archiveWrote 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/zhaoxuya520/reverse-skill/competition-zip-archive)<a href="https://agentmods.dev/skills/zhaoxuya520/reverse-skill/competition-zip-archive"><img src="https://agentmods.dev/badge/skills/zhaoxuya520/reverse-skill/competition-zip-archive/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/zhaoxuya520/reverse-skill/competition-zip-archive"><img src="https://agentmods.dev/badge/skills/zhaoxuya520/reverse-skill/competition-zip-archive.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00112 | $0.01276 |
| Opus 5 | $0.00056 | $0.00638 |
| Sonnet 5 | $0.00022 | $0.00255 |
| Haiku 4.5 | $0.00011 | $0.00128 |
Grade A, and why
competition-zip-archive 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Competition ZIP Archive
Use this skill only as a downstream specialization after $ctf-sandbox-orchestrator is active and has established sandbox assumptions, evidence priorities, and the analysis project root. If that has not happened yet, return to $ctf-sandbox-orchestrator first.
Use this skill when the decisive path is an encrypted ZIP/PKZIP archive rather than an upload parser or a generic crypto blob. Prefer the legacy ZipCrypto known-plaintext path when the challenge gives a predictable file, format header, template, or other recoverable plaintext. Do not begin with blind password brute force.
Reply in Simplified Chinese unless the user explicitly requests English. Keep commands and tool output in their original form.
Quick Start
- Preserve the original archive, compute a hash, and work on a copy under the analysis project's
work/<case>/directory. - Confirm the actual archive format and list entries before attempting a password attack.
- Determine whether the entry uses legacy ZipCrypto.
bkcrackdoes not recover WinZip AES or other modern encryption. - Build an exact known-plaintext candidate. The attack needs at least 12 known plaintext bytes, including at least 8 contiguous bytes.
- Recover the internal keys with
bkcrack, then create an unencrypted copy and extract it. - Preserve the command, entry names, known-plaintext source, recovered keys, output hash, and final flag as evidence.
Tool Setup
Use the normal tool index and bootstrap path before guessing an executable location:
powershell -NoProfile -ExecutionPolicy Bypass -File skills/scripts/refresh-tool-index.ps1
powershell -NoProfile -ExecutionPolicy Bypass -File skills/scripts/bootstrap-reverse.ps1 -Capability bkcrack
On Kali, use the equivalent capability command:
bash kali/scripts/bootstrap-reverse.sh bkcrack
The Windows capability is pinned to the v1.8.1 release and verifies the GitHub asset digest. If the tool is installed manually, refresh skills/tool-index.md afterward.
What ships with it
2 files 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.
- 11d ago First seen · 109 lines · 112 tokens per session scan A e2f86fcfded2
competition-zip-archive is a skill published in the GitHub repository zhaoxuya520/reverse-skill (35,402 stars, last pushed 7d ago), licensed MIT. It adds 112 tokens to every session and 1,276 once invoked, about $0.0006 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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