blue-team-tools/rules/windows/powershell/powershell_script/powershell_timestomp.yml

title: Powershell Timestomp
id: c6438007-e081-42ce-9483-b067fbef33c3
status: experimental
author: frack113
date: 2021/08/03
description: 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. 
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1070.006/T1070.006.md
    - https://www.offensive-security.com/metasploit-unleashed/timestomp/
tags:
    - attack.defense_evasion
    - attack.t1070.006
logsource:
    product: windows
    service: powershell
    definition: EnableScriptBlockLogging must be set to enable
detection:
    selection_id:
        EventID: 4104
    selection_ioc:
        ScriptBlockText|contains: 
            - '.CreationTime ='
            - '.LastWriteTime ='
            - '.LastAccessTime ='
            - '[IO.File]::SetCreationTime'
            - '[IO.File]::SetLastAccessTime'
            - '[IO.File]::SetLastWriteTime'
    condition: selection_id and selection_ioc
falsepositives:
    - legitime admin script
level: medium