win_taskscheduler_rare_schtask_creation.yml

title: Rare Scheduled Task Creations
id: b20f6158-9438-41be-83da-a5a16ac90c2b
status: unsupported
description: This rule detects rare scheduled task creations. Typically software gets installed on multiple systems and not only on a few. The aggregation and count function selects tasks with rare names.
author: Florian Roth (Nextron Systems)
date: 2017/03/17
modified: 2023/02/24
tags:
    - attack.persistence
    - attack.s0111
    - attack.t1053.005
logsource:
    product: windows
    service: taskscheduler
    definition: the "Microsoft-Windows-TaskScheduler/Operational" is disabled by default and should be enabled in order for this detection to work
detection:
    selection:
        EventID: 106
    filter1:
        TaskName: \Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan
    timeframe: 7d
    condition: selection and not 1 of filter* | count() by TaskName < 5
falsepositives:
    - Software installation
level: low