41 lines
1.3 KiB
YAML
41 lines
1.3 KiB
YAML
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title: Unauthorized System Time Modification
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ruletype: Sigma
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author: '@neu5ron'
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date: 2019/02/05
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description: Detect scenarios where a potentially unauthorized application or user
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is modifying the system time.
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detection:
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SELECTION_1:
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EventID: 4616
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SELECTION_2:
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ProcessName:
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- C:\Program Files\VMware\VMware Tools\vmtoolsd.exe
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- C:\Windows\System32\VBoxService.exe
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SELECTION_3:
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ProcessName: C:\Windows\System32\svchost.exe
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SELECTION_4:
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SubjectUserSid: S-1-5-19
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condition: (SELECTION_1 and not ((SELECTION_2) or (SELECTION_3 and SELECTION_4)))
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falsepositives:
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- HyperV or other virtualization technologies with binary not listed in filter portion
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of detection
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id: faa031b5-21ed-4e02-8881-2591f98d82ed
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level: medium
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logsource:
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definition: 'Requirements: Audit Policy : System > Audit Security State Change,
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Group Policy : Computer Configuration\Windows Settings\Security Settings\Advanced
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Audit Policy Configuration\Audit Policies\System\Audit Security State Change'
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product: windows
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service: security
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modified: 2021/11/27
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references:
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- Private Cuckoo Sandbox (from many years ago, no longer have hash, NDA as well)
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- Live environment caused by malware
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- https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4616
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status: test
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tags:
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- attack.defense_evasion
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- attack.t1099
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- attack.t1070.006
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