IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Persistence via Update Orchestrator Service Hijack

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Persistence via Update Orchestrator Service Hijack

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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-endpoint.events.*
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

References:

https://github.com/irsl/CVE-2020-1313

Tags:

Elastic
Host
Windows
Threat Detection
Persistence
CVE-2020-1313

Version: 7 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where event.type == "start" and process.parent.executable :
"C:\\Windows\\System32\\svchost.exe" and process.parent.args :
"UsoSvc" and not process.executable : ("?:\\ProgramData\\M
icrosoft\\Windows\\UUS\\Packages\\*\\amd64\\MoUsoCoreWorker.exe",
"?:\\Windows\\System32\\UsoClient.exe",
"?:\\Windows\\System32\\MusNotification.exe",
"?:\\Windows\\System32\\MusNotificationUx.exe",
"?:\\Windows\\System32\\MusNotifyIcon.exe",
"?:\\Windows\\System32\\WerFault.exe",
"?:\\Windows\\System32\\WerMgr.exe",
"?:\\Windows\\UUS\\amd64\\MoUsoCoreWorker.exe",
"?:\\Windows\\System32\\MoUsoCoreWorker.exe",
"?:\\Windows\\UUS\\amd64\\UsoCoreWorker.exe",
"?:\\Windows\\System32\\UsoCoreWorker.exe", "?:\\Program
Files\\Common Files\\microsoft
shared\\ClickToRun\\OfficeC2RClient.exe")

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Create or Modify System Process
- ID: T1543
- Reference URL: https://attack.mitre.org/techniques/T1543/

Rule version history

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Version 7 (8.4.0 release)

Updated query, changed from:

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\\UsoClient.exe",
"C:\\Windows\\System32\\MusNotification.exe",
"C:\\Windows\\System32\\MusNotificationUx.exe",
"C:\\Windows\\System32\\MusNotifyIcon.exe",
"C:\\Windows\\System32\\WerFault.exe",
"C:\\Windows\\System32\\WerMgr.exe" )

Version 5 (8.2.0 release)

Formatting only

Version 4 (7.12.0 release)

Updated query, changed from:

event.category:process and event.type:(start or process_started) and
process.parent.name:svchost.exe and process.parent.args:(UsoSvc or
usosvc) and not process.name:(UsoClient.exe or usoclient.exe or
MusNotification.exe or musnotification.exe or MusNotificationUx.exe or
musnotificationux.exe)

Version 3 (7.11.2 release)

Formatting only

Version 2 (7.11.0 release)

Formatting only

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