UAC Bypass via DiskCleanup Scheduled Task Hijack

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UAC Bypass via DiskCleanup Scheduled Task Hijack

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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.*
  • endgame-*

Severity: medium

Risk score: 47

Runs every: 5m

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

Maximum alerts per execution: 100

References: None

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Privilege Escalation
  • Tactic: Defense Evasion
  • Tactic: Execution
  • Data Source: Elastic Endgame
  • Data Source: Elastic Defend

Version: 105

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where host.os.type == "windows" and 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")

Framework: MITRE ATT&CKTM