Detectionmediumtest

Powershell Timestomp

Adversaries may modify file time attributes to hide new or changes to existing files. Timestomping is a technique that modifies the timestamps of a file (the modify, access, create, and change times), often to mimic files that are in the same folder.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

François HubautCreated Tue Aug 03Updated Sun Dec 25c6438007-e081-42ce-9483-b067fbef33c3windows

Log Source

WindowsPowerShell Script

ProductWindows← raw: windows

CategoryPowerShell Script← raw: ps_script

Definition

Requirements: Script Block Logging must be enabled

Detection Logic

detection:
    selection_ioc:
        ScriptBlockText|contains:
            - '.CreationTime ='
            - '.LastWriteTime ='
            - '.LastAccessTime ='
            - '[IO.File]::SetCreationTime'
            - '[IO.File]::SetLastAccessTime'
            - '[IO.File]::SetLastWriteTime'
    condition: selection_ioc