Analytic 2238

Real-time network monitoring identifies a field device's source Media Access Control (MAC) address changing without a corresponding documented hardware replacement, combined with protocol-level anomalies (transaction identifier reuse, function-code patterns deviating from baseline) for traffic associated with that device Internet Protocol (IP) address. OT operational-fidelity gate: Alert only when the asset's documented role does not permit the connection and the destination/proxy/service is outside the approved communications profile, with process/service identity used as corroboration where available. Suppress approved vendor support, update repositories, remote operations, failover paths, and documented temporary connectivity.

1. Overview

1.1 References

1.2 Identified Requirements

1.3 Related Regulations

2. Identified Requirements

3. Related Regulations

Linked Issues

• MITREATTACK -

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