@iocium/ioc-diff

A full-featured, ESM-compatible IOC diffing and normalization library + CLI for InfoSec tooling.

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🚀 Features

• ✅ IOC diffing with added, removed, and changed outputs
• 🧠 Fuzzy matching support (levenshtein)
• 📥 Support for multiple formats:
  • Plaintext (.txt)
  • JSON and MISP
  • CSV (with smart header matching)
  • YARA rules (.yara)
  • Sigma rules (.yml / .yaml)
• 🧪 TypeScript-native with 100% test coverage
• 📦 Works in Node.js, Cloudflare Workers, and modern browsers
• 🧼 Built-in validation and deduplication
• ⚙️ CLI and library modes

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📦 Installation

npm install @iocium/ioc-diff
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🧰 Usage (Library)

import { diffIOCs, parsePlainIOCs } from '@iocium/ioc-diff';

const oldList = parsePlainIOCs(['malicious.com', '1.1.1.1']);
const newList = parsePlainIOCs(['malicious.com', '2.2.2.2']);

const result = diffIOCs(oldList, newList, {
  matchBy: 'value+type',
  compareTags: true,
  fuzzyMatch: true,
  fuzzyThreshold: 0.9
});

console.log(result.added);    // IOCs in new but not old
console.log(result.removed);  // IOCs in old but not new
console.log(result.changed);  // Matching IOCs with tag/severity differences
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🖥️ Usage (CLI)

ioc-diff --old old.csv --new new.csv --old-format csv --new-format csv
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🔧 Options

Flag	Description
--old	Path to old IOC file
--new	Path to new IOC file
--old-format	Override format detection
--new-format	Override format detection
--fuzzy	Enable fuzzy matching
--threshold	Fuzzy similarity threshold (0–1)

📁 Supported Formats

• plaintext
• json
• misp
• csv
• yara
• sigma

🧪 Example

ioc-diff --old iocs_old.txt --new iocs_new.txt
ioc-diff --old old.json --new new.csv --old-format json --new-format csv
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📚 Advanced Features

• Auto-type inference (ip, domain, url, email, sha256, md5)
• Duplicate suppression by value+type
• Optional matching by value only (matchBy: 'value')
• Extensible IOC schema with tags, severity, source
• Fully typed API with DiffOptions, IOC, and IOCDiffResult

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🧪 Testing

npm run build
npm test -- --coverage
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📄 License

MIT

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✨ Contributing

PRs welcome! Please write tests and follow ESM-compatible conventions.