SigmaHQ/rules/windows/process_creation/win_susp_fsutil_usage.yml

title: Fsutil suspicious invocation
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)
author: Ecco
date: 2019/09/26
level: high
references:
    - https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-usn
logsource:
    category: process_creation
    product: windows
detection:
    binary_1:
        Image: '*\fsutil.exe'
    binary_2:
        OriginalFileName: 'fsutil.exe'
    selection:
        CommandLine: 
            - '* deletejournal *'  # usn deletejournal ==> generally ransomware or attacker
            - '* createjournal *'  # usn createjournal ==> can modify config to set it to a tiny size
 
    condition: (1 of binary_*) and selection
    
falsepositives:
    - Admin activity
    - Scripts and administrative tools used in the monitored environment