Nasreddine Bencherchali
598d29f811
chore: change tags, date, modified fields to comply with v2 of the Sigma spec. chore: update the related type from `obsoletes` to `obsolete`. chore: update local json schema to the latest version.
56 lines
2.4 KiB
YAML
56 lines
2.4 KiB
YAML
title: Scheduled TaskCache Change by Uncommon Program
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id: 4720b7df-40c3-48fd-bbdf-fd4b3c464f0d
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status: test
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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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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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date: 2021-06-18
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modified: 2023-08-17
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tags:
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- attack.persistence
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- attack.t1053
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- attack.t1053.005
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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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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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filter_svchost:
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Image: 'C:\WINDOWS\system32\svchost.exe'
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filter_ngen:
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Image|startswith: 'C:\Windows\Microsoft.NET\Framework' # \Framework\ and \Framework64\
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Image|endswith: '\ngen.exe'
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TargetObject|contains:
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- '\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tasks\{B66B135D-DA06-4FC4-95F8-7458E1D10129}'
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- '\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\Microsoft\Windows\.NET Framework\.NET Framework NGEN'
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filter_office_click_to_run:
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Image:
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- 'C:\Program Files\Microsoft Office\root\Integration\Integrator.exe'
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- 'C:\Program Files (x86)\Microsoft Office\root\Integration\Integrator.exe'
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filter_msiexec:
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Image: 'C:\Windows\System32\msiexec.exe'
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filter_dropbox_updater:
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Image:
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- 'C:\Program Files (x86)\Dropbox\Update\DropboxUpdate.exe'
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- 'C:\Program Files\Dropbox\Update\DropboxUpdate.exe'
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filter_explorer:
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Image: 'C:\Windows\explorer.exe'
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TargetObject|contains: '\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\Microsoft\Windows\PLA\Server Manager Performance Monitor\'
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filter_system:
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Image: 'System'
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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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