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1.7 KiB
API Reference — Performing Network Traffic Analysis with Zeek
Libraries Used
- pathlib: Read Zeek TSV log files
- subprocess: Execute Zeek on PCAP files
- collections.Counter: Traffic pattern aggregation
CLI Interface
python agent.py conn --log conn.log
python agent.py dns --log dns.log
python agent.py http --log http.log
python agent.py notice --log notice.log
python agent.py run --pcap capture.pcap [--output-dir /tmp/zeek_output]
Core Functions
parse_zeek_log(log_file) — Generic Zeek TSV parser
Parses #fields header and data rows. Returns headers and record list.
analyze_conn_log(conn_log) — Connection analysis
Statistics: protocols, services, top IPs/ports, total bytes, long connections (>1hr).
analyze_dns_log(dns_log) — DNS query analysis
Detects: long queries (>50 chars), TXT queries, NXDOMAIN responses. Flags potential DNS tunneling indicators.
analyze_http_log(http_log) — Web traffic analysis
Tracks: methods, status codes, top hosts, user agents. Flags suspicious UAs: curl, wget, python, powershell, certutil, bitsadmin.
analyze_notice_log(notice_log) — Security alert review
Parses Zeek notice.log for detected security events.
run_zeek_on_pcap(pcap_file, output_dir) — Generate Zeek logs from PCAP
Executes Zeek against PCAP to produce conn.log, dns.log, http.log, etc.
Zeek Log Fields
| Log | Key Fields |
|---|---|
| conn.log | id.orig_h, id.resp_h, id.resp_p, proto, service, duration, orig_bytes |
| dns.log | query, qtype_name, rcode_name |
| http.log | method, host, uri, status_code, user_agent |
| notice.log | note, msg, src, dst |
Dependencies
System: zeek (for PCAP processing) No Python packages required.