Individual skill

hardware-ot-ics

Assess OT/ICS environments — PLC, SCADA, DCS, HMI — safely and passive-first: Purdue-model zoning, industrial protocol discovery (Modbus, S7, DNP3, EtherNet/IP), mirrored-traffic analysis, and read-only verification. Load for an authorized engagement touching industrial control networks, engineering workstations, historians, or IT/OT boundaries. Signals: ports 502, 102, 44818, 20000; Modbus/S7comm banners; PLC/RTU inventory requests.

skills/hardware/hardware-ot-ics/SKILL.md

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Last checked: Nov 7, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

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engineering Derived category

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# OT / ICS security assessment (passive-first)

## When it applies
The engagement touches an industrial environment — PLC/RTU controllers, SCADA/DCS, HMIs,
engineering workstations, historians, jump hosts, or the IT/OT boundary (firewall rules, data
diodes). **A misstep here can cause physical harm, not just downtime.** Load `tradecraft-scope-roe`
and require the written authorization to spell out: the site and network segments, whether active
scanning is allowed, and whether writing coils/registers is allowed — **the default for both is
NO**. Work passive-first; nothing touches a PLC's state until the scope explicitly says so.

## Why it works
Industrial protocols (Modbus, S7comm, DNP3, EtherNet/IP) predate hostile networks: they run in
cleartext with no authentication (`CWE-306`), so anyone who can reach the port can read process
state — and usually write it. That's exactly why the assessment itself is the risk: a high-rate