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API Reference: Tracking Threat Actor Infrastructure
Pivoting Techniques
| Technique | Source | Discovers |
|---|---|---|
| Passive DNS | DNS resolvers | Domains on same IP, historical mappings |
| Reverse WHOIS | Registrar data | Domains by same registrant |
| SSL Certificate | CT logs, direct | Shared certs, SANs, issuers |
| Shodan/Censys | Internet scanning | Open ports, services, banners |
| HTTP fingerprint | Server responses | Body hash, headers, favicon |
| JARM/JA3S | TLS handshake | C2 framework identification |
API Endpoints
| Service | Endpoint | Auth |
|---|---|---|
| Shodan Host | GET /shodan/host/{ip}?key= |
API key |
| VirusTotal IP | GET /api/v3/ip-addresses/{ip} |
x-apikey header |
| VirusTotal Domain | GET /api/v3/domains/{domain} |
x-apikey header |
| SecurityTrails | GET /v1/domain/{d}/subdomains |
APIKEY header |
| RDAP WHOIS | GET https://rdap.org/domain/{d} |
None |
Network Fingerprinting
| Method | Tool | Description |
|---|---|---|
| JARM | jarm.py | Active TLS server fingerprint |
| JA3S | Zeek/Wireshark | Passive TLS Server Hello hash |
| Favicon hash | Shodan http.favicon.hash |
mmh3 hash of favicon.ico |
| HTTP body hash | SHA-256 | Response body fingerprint |
| Server banner | HTTP Server header | Software identification |
Python Libraries
| Library | Version | Purpose |
|---|---|---|
requests |
>=2.28 | API queries to Shodan/VT |
ssl |
stdlib | TLS certificate retrieval |
socket |
stdlib | DNS resolution, connections |
hashlib |
stdlib | Certificate/content fingerprinting |
References
- Shodan API: https://developer.shodan.io/api
- VirusTotal API v3: https://docs.virustotal.com/reference/overview
- Certificate Transparency: https://certificate.transparency.dev/
- JARM: https://github.com/salesforce/jarm