Identifies suspicious processes being spawned by the Microsoft Exchange Server Unified Messaging (UM) service. This activity has been observed exploiting CVE-2021-26857.
Rule type: eql
Risk score: 47
Runs every: 5 minutes
Maximum alerts per execution: 100
- Threat Detection
- Initial Access
Added (Elastic Stack release): 7.12.0
Rule authors: Elastic, Austin Songer
Rule license: Elastic License v2
Legitimate processes may be spawned from the Microsoft Exchange Server Unified Messaging (UM) service. If known processes are causing false positives, they can be exempted from the rule.
process where event.type == "start" and process.parent.name : ("UMService.exe", "UMWorkerProcess.exe") and not process.name : ("werfault.exe", "wermgr.exe")