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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
1.6 KiB
1.6 KiB
API Reference: Detecting Modbus Command Injection Attacks
Modbus Function Codes
| Code | Function | Risk |
|---|---|---|
| 1 | Read Coils | Read |
| 3 | Read Holding Registers | Read |
| 5 | Write Single Coil | Write (dangerous) |
| 6 | Write Single Register | Write (dangerous) |
| 15 | Write Multiple Coils | Write (dangerous) |
| 16 | Write Multiple Registers | Write (dangerous) |
| 8 | Diagnostics | Diagnostic |
Zeek Modbus Log
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p func
Suricata Modbus Rules
alert modbus any any -> any 502 (msg:"Modbus Write Coil"; \
modbus: function 5; sid:3000001;)
alert modbus any any -> any 502 (msg:"Modbus Write Multiple Registers"; \
modbus: function 16; sid:3000002;)
pymodbus Library
from pymodbus.client import ModbusTcpClient
client = ModbusTcpClient("192.168.1.100", port=502)
client.connect()
result = client.read_holding_registers(0, 10, slave=1)
print(result.registers)
client.close()
Scapy Modbus Parsing
from scapy.contrib.modbus import ModbusADURequest
from scapy.all import rdpcap
pkts = rdpcap("modbus.pcap")
for pkt in pkts:
if pkt.haslayer(ModbusADURequest):
print(f"Function: {pkt.funcCode}")
Detection Thresholds
| Anomaly | Threshold | Severity |
|---|---|---|
| Write flood | >20 writes/60s | CRITICAL |
| Unknown function code | Any | HIGH |
| Unauthorized master | Not in allowlist | CRITICAL |
CLI Usage
python agent.py --zeek-log modbus.log
python agent.py --zeek-log modbus.log --authorized-masters 10.0.0.1 10.0.0.2