win_security_gpo_scheduledtasks.yml

title: Persistence and Execution at Scale via GPO Scheduled Task
id: a8f29a7b-b137-4446-80a0-b804272f3da2
status: test
description: Detect lateral movement using GPO scheduled task, usually used to deploy ransomware at scale
references:
    - https://twitter.com/menasec1/status/1106899890377052160
    - https://www.secureworks.com/blog/ransomware-as-a-distraction
author: Samir Bousseaden
date: 2019/04/03
modified: 2021/11/27
tags:
    - attack.persistence
    - attack.lateral_movement
    - attack.t1053.005
logsource:
    product: windows
    service: security
    definition: 'The advanced audit policy setting "Object Access > Audit Detailed File Share" must be configured for Success/Failure'
detection:
    selection:
        EventID: 5145
        ShareName: '\\\\\*\\SYSVOL' # looking for the string \\*\SYSVOL
        RelativeTargetName|endswith: 'ScheduledTasks.xml'
        Accesses|contains:
            - 'WriteData'
            - '%%4417'
    condition: selection
falsepositives:
    - If the source IP is not localhost then it's super suspicious, better to monitor both local and remote changes to GPO scheduledtasks
level: high