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Risk-based use cases for OT security monitoring

A catalogue of monitoring use cases for OT systems linked to threats.

This document proposes a risk-based approach to OT security monitoring. Use are presented to detect different stages of an attack:

1. Vulnerability management use cases find and fix vulnerabilities before attackers can exploit them
2. Misuse detection use cases look for signs of the exploits.
3. Access monitoring use cases look for unauthorized access by attackers once they have gained valid access.
4. Reviewing access logs use cases look for unauthorized steps taken by attackers once they have accessed a system.

Each of the use cases is linked to the threats it can detect. In this way, grid operators can select the most effective use cases based on a risk assessment. Use cases can be chosen to mitigate the highest risks and complement preventive measures.

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