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26 lines
939 B
YAML
26 lines
939 B
YAML
title: Fsutil suspicious invocation
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description: Detects suspicious parameters of fsutil (deleting USN journal, configuring it with small size..). Might be used by ransomwares during the attack (seen by NotPetya and others)
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author: Ecco
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date: 2019/09/26
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level: high
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references:
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- https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-usn
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logsource:
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category: process_creation
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product: windows
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detection:
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binary_1:
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Image: '*\fsutil.exe'
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binary_2:
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OriginalFileName: 'fsutil.exe'
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selection:
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CommandLine:
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- '* deletejournal *' # usn deletejournal ==> generally ransomware or attacker
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- '* createjournal *' # usn createjournal ==> can modify config to set it to a tiny size
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condition: (1 of binary_*) and selection
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falsepositives:
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- Admin activity
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- Scripts and administrative tools used in the monitored environment
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