---
Name: Fsutil.exe
Description: File System Utility
Author: 'Elliot Killick'
Created: 2021-08-16
Commands:
  - Command: fsutil.exe file setZeroData offset=0 length=9999999999 C:\Windows\Temp\payload.dll
    Description: Zero out a file
    Usecase: Can be used to forensically erase a file
    Category: Tamper
    Privileges: User
    MitreID: T1485
    OperatingSystem: Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10
  - Command: 'fsutil.exe usn deletejournal /d c:'
    Description: Delete the USN journal volume to hide file creation activity
    Usecase: Can be used to hide file creation activity
    Category: Tamper
    Privileges: User
    MitreID: T1485
    OperatingSystem: Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10
  - Command: fsutil.exe trace decode
    Description: Executes a pre-planted binary named netsh.exe from the current directory.
    Usecase: Spawn a pre-planted executable from fsutil.exe.
    Category: Execute
    Privileges: User
    MitreID: T1218
    OperatingSystem: Windows 11
Full_Path:
  - Path: C:\Windows\System32\fsutil.exe
  - Path: C:\Windows\SysWOW64\fsutil.exe
Detection:
  - IOC: fsutil.exe should not be run on a normal workstation
  - IOC: file setZeroData (not case-sensitive) in the process arguments
  - IOC: Sysmon Event ID 1
  - IOC: Execution of process fsutil.exe with trace decode could be suspicious
  - IOC: Non-Windows netsh.exe execution
  - Sigma: https://github.com/SigmaHQ/sigma/blob/ff5102832031425f6eed011dd3a2e62653008c94/rules/windows/process_creation/proc_creation_win_susp_fsutil_usage.yml
Resources:
  - Link: https://twitter.com/0gtweet/status/1720724516324704404
Acknowledgement:
  - Person: Elliot Killick
    Handle: '@elliotkillick'
  - Person: Jimmy
    Handle: '@bohops'
  - Person: Grzegorz Tworek
    Handle: '@0gtweet'