Individual skill
monitoring-scada-modbus-traffic-anomalies
Monitors Modbus TCP traffic on SCADA and ICS networks to detect anomalous function code usage, unauthorized register writes, and suspicious communication patterns. The analyst uses deep packet inspection with pymodbus, Scapy, and Zeek to baseline normal PLC/RTU communication behavior, then applies statistical and rule-based anomaly detection to identify reconnaissance, parameter manipulation, and denial-of-service attacks targeting Modbus devices on port 502. Activates for requests involving Modbus traffic analysis, SCADA network monitoring, ICS anomaly detection, PLC security monitoring, or OT network threat detection.
skills/monitoring-scada-modbus-traffic-anomalies/SKILL.md
Source commit 54a798831d2266a3ca61ce68a7acb80b81160d57
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- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 35,897
- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- modbus-tcp Declared skill tag
- scada Declared skill tag
- ics-security Declared skill tag
- deep-packet-inspection Declared skill tag
- anomaly-detection Declared skill tag
- ot-monitoring Declared skill tag
- security Derived category
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Read excerpt
# Monitoring SCADA Modbus Traffic Anomalies
## When to Use
- Monitoring OT/ICS networks for unauthorized Modbus commands targeting PLCs, RTUs, or HMIs
- Detecting reconnaissance activity such as Modbus device enumeration (function code 43, Read Device Identification)
- Identifying unauthorized write operations (function codes 05, 06, 15, 16) to coils and holding registers that could alter physical process parameters
- Baselining normal Modbus communication patterns and alerting on deviations in function code distribution, register access ranges, or timing intervals
- Investigating suspected sabotage or insider threats manipulating SCADA process values through Modbus register writes
**Do not use** on networks without authorization from the asset owner, for active injection or fuzzing against production SCADA systems, or as a replacement for safety-instrumented systems (SIS) that provide physical process protection.
## Prerequisites
- Network tap or SPAN port on the OT network segment carrying Modbus TCP traffic (port 502)