diff --git a/yml/OSBinaries/Fsutil.yml b/yml/OSBinaries/Fsutil.yml index 28593e48..ecff0a73 100644 --- a/yml/OSBinaries/Fsutil.yml +++ b/yml/OSBinaries/Fsutil.yml @@ -27,18 +27,30 @@ Commands: OperatingSystem: Windows 11 Tags: - Execute: EXE + - Command: fsutil.exe file createnew {PATH_ABSOLUTE} {LENGTH_IN_BYTES} + Description: Instantly creates a new file of any specified size to exhaust free disk space. + Usecase: Exhaust available disk space to impair defensive tools (preventing Windows Defender updates and halting local logging) or cause endpoint denial of service. + Category: Tamper + Privileges: User + MitreID: T1562.001 + OperatingSystem: Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, 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: file createnew (not case-sensitive) in the process arguments - IOC: Sysmon Event ID 1 + - IOC: Sysmon Event ID 11 - 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 + - Link: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-file + - Link: https://github.com/MSNightmare/BigDiskBuster + - Link: https://github.com/DevCop95/BDB-Guardian Acknowledgement: - Person: Elliot Killick Handle: '@elliotkillick' @@ -46,3 +58,7 @@ Acknowledgement: Handle: '@bohops' - Person: Grzegorz Tworek Handle: '@0gtweet' + - Person: MSNightmare + Handle: '@MSNightmare' + - Person: DevCop95 + Handle: '@DevCop95'