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opcua

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OPC-UA (TCP 4840) attack playbook — endpoint enumeration, SecurityPolicy mapping, anonymous/weak-auth abuse, address-space browsing and tag read, HistoryRead exfiltration, Method call for control actions, session-exhaustion DoS. Modern IT/OT DMZ convergence protocol replacing legacy fieldbus.

packages/decepticon/decepticon/skills/standard/exploit/ics-ot/opcua/SKILL.md

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# OPC-UA Attack Playbook (TCP 4840)

OPC-UA is the dominant modern IT/OT convergence protocol — Siemens, ABB, Rockwell, Honeywell, and most new DCS/SCADA deployments expose it alongside or instead of legacy fieldbus. It supports security (signing + encryption) but many deployments leave `SecurityPolicy: None` active for "backwards compatibility," giving full unauthenticated access to the address space.

## SAFETY FIRST

OPC-UA Method calls can directly invoke control actions (start/stop, setpoint override, firmware update). **Confirm written scope authorization before any call to Method nodes or write to Variable nodes.** Read-only browsing (BrowseRequest, ReadRequest on status/telemetry nodes) is generally safe.

## Prerequisites

```bash
# Install asyncua (successor to python-opcua / opcua-asyncio)
pip install asyncua
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