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1.6 KiB
1.6 KiB
API Reference — Performing Network Packet Capture Analysis
Libraries Used
- scapy: PCAP parsing, protocol dissection, packet analysis
- subprocess: Execute tshark for HTTP extraction and conversation analysis
- collections.Counter: Traffic statistics aggregation
CLI Interface
python agent.py analyze --pcap capture.pcap
python agent.py http --pcap capture.pcap
python agent.py suspicious --pcap capture.pcap
python agent.py conversations --pcap capture.pcap
Core Functions
analyze_pcap_scapy(pcap_file) — Protocol and IP statistics
Returns: protocol distribution, top source/dest IPs, top destination ports, DNS queries.
extract_http_requests(pcap_file) — HTTP request extraction via tshark
Extracts: source/dest IP, method, host, URI, user agent from HTTP requests.
detect_suspicious_traffic(pcap_file) — Anomaly detection
Detects: port scanning (>=20 SYN to same target), DNS exfiltration (queries >60 chars), suspicious ports (4444, 31337, 6667, etc.).
conversation_analysis(pcap_file) — TCP conversation summary
Uses tshark -z conv,tcp for conversation-level statistics.
Suspicious Port Detection
4444, 5555, 6666, 8888, 9999, 1234, 31337, 12345, 6667, 6697
Detection Categories
| Finding | Severity | Trigger |
|---|---|---|
| PORT_SCAN | HIGH | >=20 SYN packets to same target |
| DNS_EXFILTRATION | HIGH | DNS queries >60 characters |
| SUSPICIOUS_PORTS | MEDIUM | Traffic on known C2 ports |
Dependencies
pip install scapy
System: tshark (optional, for HTTP and conversation analysis)