Command Message
Where this stands
No Sigma rule can address this — the telemetry MITRE names has no Sigma logsource behind it.
Sigma has no logsource taxonomy for ICS. MITRE's telemetry here is operational historians and controller state, which no Sigma rule can address.
What the technique is
Adversaries may block a command message from reaching its intended target to prevent command execution. In OT networks, command messages are sent to provide instructions to control system devices. A blocked command message can inhibit response functions from correcting a disruption or unsafe condition.
Read it on attack.mitre.orgWhat MITRE says you would watch
- AN1916
Monitor for the termination of processes or services associated with ICS automation protocols and application software which could help detect blocked communications. Monitor for lack of operational process data which may help identify a loss of communications. This will not directly detect the technique’s execution, but instead may provide additional evidence that the technique has been used and may complement other detections. Monitor application logs for changes to settings and other events associated with network protocols that may be used to block communications. Monitor for a loss of network communications, which may indicate this technique is being used. […]
Technique names and descriptions © MITRE ATT&CK®, CC BY 4.0. Not endorsed by MITRE.