Suspicious Add Scheduled Task Parent

Detects suspicious scheduled task creations from a parent stored in a temporary folder

Sigma rule (View on GitHub)

 1title: Suspicious Add Scheduled Task Parent
 2id: 9494479d-d994-40bf-a8b1-eea890237021
 3status: test
 4description: Detects suspicious scheduled task creations from a parent stored in a temporary folder
 5references:
 6    - https://app.any.run/tasks/649e7b46-9bec-4d05-98a5-dfa9a13eaae5/
 7author: Florian Roth (Nextron Systems)
 8date: 2022/02/23
 9modified: 2022/06/02
10tags:
11    - attack.execution
12    - attack.t1053.005
13logsource:
14    product: windows
15    category: process_creation
16detection:
17    selection:
18        Image|endswith: '\schtasks.exe'
19        CommandLine|contains: '/Create '
20        ParentImage|contains:
21            - '\AppData\Local\'
22            - '\AppData\Roaming\'
23            - '\Temporary Internet'
24            - '\Users\Public\'
25    filter:
26        CommandLine|contains:
27            - 'update_task.xml'
28            - 'unattended.ini'
29    condition: selection and not 1 of filter*
30falsepositives:
31    - Software installers that run from temporary folders and also install scheduled tasks
32level: medium

References

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