steg

steg is a command for Claude Code from pashki975/thm-claude-kit. It costs 14 tokens per session (404 once invoked), scanned A, original, MIT.

A command for examining files, images, audio, and documents for hidden or embedded information. Steganography is the practice of hiding data inside ordinary-looking files.

In plain words
What is it for?
Use it to inspect metadata, find strings, extract appended or embedded files, examine image data, inspect audio and PDF contents, and recover hidden flags in cybersecurity exercises.
Why use it?
It gives you an organized path from basic file identification and metadata checks to deeper extraction and password attempts. This reduces the chance of missing information hidden behind a misleading file extension.

Command for Claude Code

Written for Claude Code: $ARGUMENTS substitution.

Install

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.

agentmods
npx agentmods add commands/pashki975/thm-claude-kit/steg
Clone the repo
git clone --depth 1 https://github.com/pashki975/thm-claude-kit

Made for: Claude Code.

Wrote 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.

agentmods badge for steg

README.md
[![agentmods](https://agentmods.dev/badge/commands/pashki975/thm-claude-kit/steg.svg)](https://agentmods.dev/commands/pashki975/thm-claude-kit/steg)
Your own site
<a href="https://agentmods.dev/commands/pashki975/thm-claude-kit/steg"><img src="https://agentmods.dev/badge/commands/pashki975/thm-claude-kit/steg.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 404 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00014 $0.00404
Opus 5 $0.00007 $0.00202
Sonnet 5 $0.00003 $0.00081
Haiku 4.5 $0.00001 $0.00040

Measured 5d ago against content hash 2693f75a8548, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

steg 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 5d 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.

.claude/commands/steg.md · 35 lines

What it actually says

Analyze the file(s): $ARGUMENTS (a path, or a directory of downloaded files)

Use when a room hands you a file to download and the flag is hidden in or behind it. Work cheap-to-slow. The flag is the goal — most of these need no shell.

1. Identify

  • file — real type regardless of extension
  • exiftool — metadata: authors, comments, GPS, flags in fields
  • strings -n 6 — grep for flag{, THM{, base64, URLs

2. Embedded / appended data

  • binwalk ; binwalk -e (or foremost )
  • try unzip/7z x on an image (polyglots)

3. Image steganography

  • steghide info ; steghide extract -sf (blank passphrase + room passwords)
  • zsteg (PNG/BMP LSB) ; stegseek (brute steghide w/ rockyou)
  • stegsolve for visual LSB / colour-plane inspection

4. Audio / docs

  • Audio: spectrogram in Audacity/sonic-visualiser (flags drawn there)
  • PDFs: pdfdetach -list, pdf-parser ; Office: unzip and read XML/macros

5. Protected/hashed

  • Hand off to /crack (zip2john etc.)

6. Summarize

Say what the file was, what was hidden, how you got it. If you recovered the flag, stop. Record in notes.md. Note: steg is mostly beginner/jeopardy-CTF — on a normal box, don't rabbit-hole where straightforward enumeration is intended.

Changes

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.

  1. 5d ago First seen · 35 lines · 14 tokens per session scan A 2693f75a8548

Subscribe to this mod's changes

steg is a command published in the GitHub repository pashki975/thm-claude-kit (2 stars, last pushed 22d ago), licensed MIT. It adds 14 tokens to every session and 404 once invoked, about $0.0001 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 2026-08-31.