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58 lines
1.7 KiB
Markdown
58 lines
1.7 KiB
Markdown
# ICS Anomaly Detection — API Reference
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## Libraries
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| Library | Install | Purpose |
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|---------|---------|---------|
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| pymodbus | `pip install pymodbus` | Modbus TCP/RTU client |
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| requests | `pip install requests` | Historian and SIEM API access |
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## Modbus TCP Protocol
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| Function Code | Name | Risk |
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|---------------|------|------|
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| 1 | Read Coils | Low |
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| 3 | Read Holding Registers | Low |
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| 5 | Write Single Coil | Medium |
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| 6 | Write Single Register | Medium |
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| 15 | Write Multiple Coils | High |
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| 16 | Write Multiple Registers | High |
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| 43 | Read Device Identification | Recon |
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## Common ICS Ports
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| Port | Protocol | Description |
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|------|----------|-------------|
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| 502 | Modbus TCP | PLC communication |
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| 102 | S7comm | Siemens S7 PLCs |
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| 44818 | EtherNet/IP | Allen-Bradley / Rockwell |
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| 20000 | DNP3 | Distributed Network Protocol |
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| 4840 | OPC-UA | OPC Unified Architecture |
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| 47808 | BACnet | Building automation |
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## pymodbus Client Usage
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```python
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from pymodbus.client import ModbusTcpClient
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client = ModbusTcpClient("192.168.1.10", port=502)
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client.connect()
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result = client.read_holding_registers(0, count=10, slave=1)
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print(result.registers)
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client.close()
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```
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## Anomaly Detection Thresholds
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| Metric | Threshold | Severity |
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|--------|-----------|----------|
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| Unusual function codes | FC 8, 17, 43, 90+ | HIGH |
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| Write frequency > 100/min | Burst writes | CRITICAL |
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| Exception responses | Any exception code | MEDIUM |
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| New source IP to PLC | Unauthorized access | CRITICAL |
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## External References
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- [pymodbus Docs](https://pymodbus.readthedocs.io/)
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- [ICS-CERT Advisories](https://www.cisa.gov/ics-advisories)
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- [NIST SP 800-82 Guide to ICS Security](https://csrc.nist.gov/publications/detail/sp/800-82/rev-3/final)
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