Persistence via Update Orchestrator Service Hijackedit

Identifies potential hijacking of the Microsoft Update Orchestrator Service to establish persistence with an integrity level of SYSTEM.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-windows.*

Severity: high

Risk score: 73

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100



  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Persistence

Version: 4 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule queryedit

process where event.type == "start" and process.parent.executable :
"C:\\Windows\\System32\\svchost.exe" and process.parent.args :
"UsoSvc" and not process.executable : (
"C:\\Windows\\System32\\WerMgr.exe" )

Threat mappingedit


Rule version historyedit

Version 4 (7.12.0 release)
  • Updated query, changed from:

    event.category:process and event.type:(start or process_started) and and process.parent.args:(UsoSvc or
    usosvc) and not or usoclient.exe or
    MusNotification.exe or musnotification.exe or MusNotificationUx.exe or
Version 3 (7.11.2 release)
  • Formatting only
Version 2 (7.11.0 release)
  • Formatting only