UAC Bypass via DiskCleanup Scheduled Task Hijackedit
Identifies User Account Control (UAC) bypass via hijacking DiskCleanup Scheduled Task. Attackers bypass UAC to stealthily execute code with elevated permissions.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
- logs-windows.*
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Privilege Escalation
Version: 100 (version history)
Added (Elastic Stack release): 7.10.0
Last modified (Elastic Stack release): 8.5.0
Rule authors: Elastic
Rule license: Elastic License v2
Investigation guideedit
Rule queryedit
process where event.type == "start" and process.args : "/autoclean"
and process.args : "/d" and not process.executable :
("C:\\Windows\\System32\\cleanmgr.exe",
"C:\\Windows\\SysWOW64\\cleanmgr.exe",
"C:\\Windows\\System32\\taskhostw.exe")
Threat mappingedit
Framework: MITRE ATT&CKTM
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Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
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Technique:
- Name: Abuse Elevation Control Mechanism
- ID: T1548
- Reference URL: https://attack.mitre.org/techniques/T1548/
Rule version historyedit
- Version 100 (8.5.0 release)
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- Formatting only
- Version 9 (8.4.0 release)
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- Formatting only
- Version 7 (8.2.0 release)
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- Formatting only
- Version 6 (7.15.0 release)
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- Formatting only
- Version 5 (7.13.0 release)
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-
Updated query, changed from:
process where event.type in ("start", "process_started") and process.args:"/autoclean" and process.args:"/d" and not process.executable : ("C:\\Windows\\System32\\cleanmgr.exe", "C:\\Windows\\SysWOW64\\cleanmgr.exe")
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- Version 4 (7.12.0 release)
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- Formatting only
- Version 3 (7.11.2 release)
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- Formatting only
- Version 2 (7.11.0 release)
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Updated query, changed from:
event.category:process and event.type:(start or process_started) and process.args:(/autoclean or /AUTOCLEAN) and process.parent.name:svchost.exe and not process.executable:("C:\Windows\System32\cleanmgr.exe" or "C:\Windows\SysWOW64\cleanmgr.exe")
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