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mukul975
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Complete skill folder anatomy across all cybersecurity skills: - scripts/agent.py: 80-150 line Python agents using real libraries (impacket, boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.) - references/api-reference.md: real API documentation with method signatures - LICENSE: MIT license for all skill folders
49 lines
1.6 KiB
Markdown
49 lines
1.6 KiB
Markdown
# API Reference: NetFlow v9/IPFIX Analysis
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## Python netflow Library
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```python
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import netflow
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# Parse a raw NetFlow packet
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packet, templates = netflow.parse_packet(raw_bytes, templates={})
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# templates must persist between calls for v9/IPFIX
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for flow in packet.flows:
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flow.IPV4_SRC_ADDR # Source IP
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flow.IPV4_DST_ADDR # Destination IP
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flow.L4_SRC_PORT # Source port
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flow.L4_DST_PORT # Destination port
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flow.PROTOCOL # IP protocol (6=TCP, 17=UDP)
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flow.IN_BYTES # Bytes transferred
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flow.IN_PKTS # Packet count
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flow.TCP_FLAGS # TCP flags bitmask
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flow.FIRST_SWITCHED # Flow start time
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flow.LAST_SWITCHED # Flow end time
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```
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## CLI Tools
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```bash
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python -m netflow.collector -p 9995 -D /tmp/flows # Collector
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python -m netflow.analyzer -f /tmp/flows/*.json # Analyzer
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```
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## NetFlow v9 Field Types
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| Field | ID | Description |
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|-------|-----|-------------|
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| IN_BYTES | 1 | Input bytes |
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| IN_PKTS | 2 | Input packets |
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| PROTOCOL | 4 | IP protocol |
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| L4_SRC_PORT | 7 | Source port |
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| IPV4_SRC_ADDR | 8 | Source IPv4 |
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| L4_DST_PORT | 11 | Destination port |
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| IPV4_DST_ADDR | 12 | Destination IPv4 |
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| TCP_FLAGS | 6 | TCP flags |
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| FIRST_SWITCHED | 22 | Flow start sysUpTime |
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| LAST_SWITCHED | 21 | Flow end sysUpTime |
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## Detection Algorithms
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| Pattern | Method | Threshold |
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|---------|--------|-----------|
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| Port scan | Unique dst_ports per src-dst pair | >20 ports |
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| Network sweep | Unique dst_ips per source | >50 hosts |
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| Exfiltration | Total bytes per src-dst pair | >100MB |
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| C2 beaconing | Interval jitter ratio | <0.15 |
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