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: 5m
Maximum alerts per execution: 100
- Threat Detection
- Initial Access
- Austin Songer
Rule license: Elastic License v2
## Config If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
process where event.type == "start" and process.parent.name : ("UMService.exe", "UMWorkerProcess.exe") and not process.name : ("werfault.exe", "wermgr.exe")
Framework: MITRE ATT&CKTM