title: Persistence and Execution at Scale via GPO Scheduled Task
author: Samir Bousseaden
date: 2019/04/03
description: Detect lateral movement using GPO scheduled task, usually used to deploy
  ransomware at scale
detection:
  SELECTION_1:
    EventID: 5145
  SELECTION_2:
    ShareName: \\*\SYSVOL
  SELECTION_3:
    RelativeTargetName: '*ScheduledTasks.xml'
  SELECTION_4:
    Accesses:
    - '*WriteData*'
    - '*%%4417*'
  condition: (SELECTION_1 and SELECTION_2 and SELECTION_3 and SELECTION_4)
falsepositives:
- if the source IP is not localhost then it's super suspicious, better to monitor
  both local and remote changes to GPO scheduledtasks
id: a8f29a7b-b137-4446-80a0-b804272f3da2
level: high
logsource:
  definition: The advanced audit policy setting "Object Access > Audit Detailed File
    Share" must be configured for Success/Failure
  product: windows
  service: security
references:
- https://twitter.com/menasec1/status/1106899890377052160
- https://www.secureworks.com/blog/ransomware-as-a-distraction
status: experimental
tags:
- attack.persistence
- attack.lateral_movement
- attack.t1053
- attack.t1053.005
ruletype: SIGMA