Analytic 1905

Real-time monitoring identifies an Industrial Control System (ICS) protocol write to output register addresses on a field device from a source not in the approved write-source list, correlated with a discrepancy between the value reported by the Input/Output (I/O) image and an independent measurement of the actual physical output state. OT operational-fidelity gate: Alert only when the action is not attributable to an authorized operator/engineering source for the specific target and function, and it is either outside an approved change/maintenance window or lacks matching change-control context; where telemetry permits, require corroborating device, configuration, or process-state effect. Suppress activity that fully matches approved maintenance, commissioning, failover, recovery, or tested control procedures. The independent measurement is process-state telemetry, not network-flow evidence; implementation requires a separately trusted sensor/historian/measurement path with time alignment and an engineering-defined tolerance.

1. Overzicht

1.1 Referenties

1.2 Geïdentificeerde eisen

1.3 Gerelateerde regelingen

2. Geïdentificeerde eisen

3. Gerelateerde regelingen

Gekoppelde issues

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