Hex Vetter

hex-vetter 🔬

Physical-layer hex auditing skill forects hidden binary data AI agents. Det, control characters, and encoding-based attacks.

Overview

hex-vetter performs deep hex-level analysis of files to detect what text-based reviewers miss. It's designed for security audits of skill packages, detecting hidden payloads, obfuscated code, and suspicious binary data.

Installation

git clone https://github.com/Matrix-Meta/hex-vetter.git
cd hex-vetter
npm install

Usage

Command Line

# Scan a single file
node vet.js <file_path>

# Scan a directory recursively
node scan_all.js <directory_path>

# Verify file integrity
node verify.js <file_path>

As a Module

const { scanFile } = require('./vet.js');
const result = await scanFile('/path/to/file.bin');

console.log(result.riskLevel);    // 'LOW', 'MEDIUM', 'HIGH'
console.log(result.flags);       // Array of detected issues
console.log(result.hexDump);      // Formatted hex output

What It Detects

API Reference

scanFile(filePath)

Scans a single file and returns analysis results.

const { scanFile } = require('./vet.js');

const result = await scanFile('./some file.js');
// Returns: { riskLevel, flags, hexDump, details }

scanDirectory(dirPath)

Recursively scans all files in a directory.

const { scanDirectory } = require('./scan_all.js');

const results = await scanDirectory('./skills/');
// Returns: Array of scan results for each file

verifyIntegrity(filePath)

Verifies file integrity using stored checksums.

const { verifyIntegrity } = require('./verify.js');

const result = await verifyIntegrity('./starfragment.js');
// Returns: { valid, expected, actual }

Risk Levels

• 🟢 LOW: Normal file, no suspicious content detected
• 🟡 MEDIUM: Some flags detected, manual review recommended
• 🔴 HIGH: Significant suspicious content, MUST be manually reviewed

Security Policy

1. Mandatory Review: Any file flagged as 🔴 HIGH RISK MUST be manually inspected by a human or a trusted agent before the skill is used.

2. False Positives: Risk ratings are heuristic. Common false positives include:

   • .env mentions in .npmignore
   • Documentation with encoded examples
   • Compressed assets

3. Agent Action: If an agent performs an audit and finds HIGH RISK, it MUST:

   • Notify the user immediately
   • Provide the specific reason (e.g., signature match vs. binary data)
   • Suggest next steps for manual review

Architecture

hex-vetter/
├── starfragment.js       # Core module (self-modifying storage)
├── scan_all.js          # Recursive directory scanner
├── verify.js            # Integrity verification
├── vet.js               # Main entry point
├── README.md
└── SKILL.md            # This file

Self-Modifying Storage

The starfragment.js module uses self-modifying storage - it reads and writes data from/to its own file at runtime. Constants are encoded and stored as valid JavaScript comments at the end of the source file.

Contributing

Issues and pull requests are welcome on GitHub: https://github.com/Matrix-Meta/hex-vetter