Nasreddine Bencherchali
31 lines
1.6 KiB
YAML
31 lines
1.6 KiB
YAML
title: Scheduled Task Deletion
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id: 4f86b304-3e02-40e3-aa5d-e88a167c9617
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status: experimental
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description: Detects scheduled task deletion events. Scheduled tasks are likely to be deleted if not used for persistence. Malicious Software often creates tasks directly under the root node e.g. \TASKNAME
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references:
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- https://twitter.com/matthewdunwoody/status/1352356685982146562
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- https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4699
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author: David Strassegger, Tim Shelton
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date: 2021/01/22
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modified: 2023/01/20
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tags:
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- attack.execution
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- attack.privilege_escalation
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- car.2013-08-001
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- attack.t1053.005
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logsource:
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product: windows
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service: security
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definition: 'Requirements: The Advanced Audit Policy setting Object Access > Audit Other Object Access Events has to be configured to allow this detection. We also recommend extracting the Command field from the embedded XML in the event data.'
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detection:
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selection:
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EventID: 4699
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filter_exact:
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TaskName: '\Microsoft\Windows\RemovalTools\MRT_ERROR_HB' # Triggered by ParentCommandLine=C:\WINDOWS\system32\MRT.exe /EHB /HeartbeatFailure ErrorStack,Previous=ErrorStack,Previous=ErrorStack,Previous=ErrorStack,Previous=ErrorStack,Previous=SubmitHeartbeatReportData,Hr=0x80072f8f,Hr=0x80072f8f,Hr=0x80072f8f,Hr=0x80072f8f,Hr=0x80072f8f /HeartbeatError 0x80072f8f
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filter_contains:
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TaskName|contains: '\Mozilla\Firefox Default Browser Agent ' # Triggered by firefox updates
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condition: selection and not 1 of filter_*
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falsepositives:
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- Software installation
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level: low
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