Online Edit
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 execute an online edit of a PLC to update parts of an existing program. It does not require stopping the PLC which allows it to continue running during transfer and reconfiguration without interruption to process control. Adversaries may leverage this approach to minimize downtime and evade detection. The ability to perform an online edit to the PLC typically relies on access to a workstation with the vendor-specific PLC programming software installed.
Read it on attack.mitre.orgWhat MITRE says you would watch
- AN2058
Monitor device alarms for program downloads, although not all devices produce such alarms. Monitor for protocol functions related to program download or modification. Program downloads may be observable in ICS automation protocols and remote management protocols. Consult asset management systems to understand expected program versions. Monitor devices configuration logs which may contain alerts that indicate whether a program download has occurred. Devices may maintain application logs that indicate whether a full program download, online edit, or program append function has occurred.
Technique names and descriptions © MITRE ATT&CK®, CC BY 4.0. Not endorsed by MITRE.