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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
53 lines
1.9 KiB
Markdown
53 lines
1.9 KiB
Markdown
# API Reference: Reverse Engineering Ransomware Encryption
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## Cryptographic Algorithm Constants
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| Algorithm | Signature | Description |
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|-----------|-----------|-------------|
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| AES | S-Box starting `0x63 0x7C 0x77` | AES Rijndael substitution box |
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| RSA | DER `0x30 0x82` prefix | ASN.1 RSA key structure |
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| ChaCha20/Salsa20 | `expand 32-byte k` | Stream cipher constant |
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| RC4 | Sequential 0-255 state | Key scheduling algorithm init |
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## Encryption Analysis Techniques
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| Technique | Tool | Purpose |
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|-----------|------|---------|
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| Entropy analysis | `ent`, Python | Detect encrypted regions |
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| Constant scanning | IDA/Ghidra YARA | Find crypto implementations |
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| API tracing | x64dbg, Frida | Trace CryptEncrypt/BCrypt calls |
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| Key extraction | Volatility3 | Dump keys from memory |
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## Ransomware Encryption Patterns
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| Pattern | Indicator |
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|---------|-----------|
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| Full encryption | Entropy > 7.9 across entire file |
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| Intermittent | High entropy blocks with gaps |
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| Header-only | First N bytes encrypted, rest plain |
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| Appended metadata | File larger than original (key/IV at end) |
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## Common Ransomware Crypto
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| Family | Algorithm | Key Mgmt |
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|--------|-----------|----------|
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| LockBit 3.0 | AES-256-CBC + RSA-2048 | Per-file AES key, RSA-encrypted |
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| BlackCat/ALPHV | ChaCha20 + RSA-4096 | Rust implementation |
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| Royal | AES-256-CBC + RSA-2048 | Intermittent encryption |
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| Akira | ChaCha20 | Partial file encryption |
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## Python Libraries
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| Library | Version | Purpose |
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|---------|---------|---------|
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| `hashlib` | stdlib | SHA256 hashing |
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| `struct` | stdlib | Binary data parsing |
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| `re` | stdlib | Pattern extraction |
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| `math` | stdlib | Shannon entropy calculation |
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## References
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- ID Ransomware: https://id-ransomware.malwarehunterteam.com/
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- NoMoreRansom Decryptors: https://www.nomoreransom.org/en/decryption-tools.html
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- Ghidra: https://ghidra-sre.org/
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