Analytic 1929

Real-time monitoring identifies a loss of communication with serially-connected field devices correlated with a configuration change event on the serial-to-Ethernet gateway. Documented in the 2015 Ukraine attack, where Sandworm used malicious firmware to render serial-to-Ethernet converters inoperable. 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.

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