phantinuss
36 lines
1.3 KiB
YAML
36 lines
1.3 KiB
YAML
title: Scheduled TaskCache Change by Uncommon Program
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id: 4720b7df-40c3-48fd-bbdf-fd4b3c464f0d
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description: Monitor the creation of a new key under 'TaskCache' when a new scheduled task is registered by a process that is not svchost.exe, which is suspicious
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status: experimental
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date: 2021/06/18
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modified: 2022/05/23
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references:
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- https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
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- https://labs.f-secure.com/blog/scheduled-task-tampering/
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author: Syed Hasan (@syedhasan009)
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logsource:
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category: registry_set
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product: windows
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detection:
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selection:
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EventType: SetValue
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TargetObject|contains: 'SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\'
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filter:
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TargetObject|contains:
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- 'Microsoft\Windows\UpdateOrchestrator'
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- 'Microsoft\Windows\SoftwareProtectionPlatform\SvcRestartTask\Index'
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- 'Microsoft\Windows\Flighting\OneSettings\RefreshCache\Index'
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filter_tiworker:
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Image|startswith: 'C:\Windows\'
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Image|endswith: '\TiWorker.exe'
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TargetObject|contains: '\MICROSOFT\WINDOWS NT\CURRENTVERSION\SCHEDULE\TASKCACHE\PLAIN\{1A552422-F571-4376-A7F1-5941E63D7B40}'
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filter_svchost:
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Image: 'C:\WINDOWS\system32\svchost.exe'
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condition: selection and not 1 of filter*
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falsepositives:
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- Unknown
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level: high
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tags:
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- attack.persistence
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- attack.t1053
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- attack.t1053.005 |