Analytic 1874

Real-time monitoring identifies an Industrial Control System (ICS) protocol write to a controller's task/organization-block configuration from a source not in the approved engineering workstation list, correlated against post-modification cycle timing deviation. Documented precedent: Stuxnet infected Siemens OB1 (main execution cycle block) so its malicious payload ran every cycle, and infected OB35 (watchdog/interrupt block) to suppress error reporting. 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.

1. Visão geral

1.1 Referências

1.2 Requisitos identificados

1.3 Regulamentos relacionados

2. Requisitos identificados

3. Regulamentos relacionados

Pedidos ligados

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