Powershell Timestomp

calendar Jan 4, 2023 · attack.defense_evasion attack.t1070.006  ·
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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.

Sigma rule (View on GitHub)

 1title: Powershell Timestomp
 2id: c6438007-e081-42ce-9483-b067fbef33c3
 3status: test
 4description: |
 5    Adversaries may modify file time attributes to hide new or changes to existing files.
 6    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.    
 7references:
 8    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.006/T1070.006.md
 9    - https://www.offensive-security.com/metasploit-unleashed/timestomp/
10author: frack113
11date: 2021/08/03
12modified: 2022/12/25
13tags:
14    - attack.defense_evasion
15    - attack.t1070.006
16logsource:
17    product: windows
18    category: ps_script
19    definition: 'Requirements: Script Block Logging must be enabled'
20detection:
21    selection_ioc:
22        ScriptBlockText|contains:
23            - '.CreationTime ='
24            - '.LastWriteTime ='
25            - '.LastAccessTime ='
26            - '[IO.File]::SetCreationTime'
27            - '[IO.File]::SetLastAccessTime'
28            - '[IO.File]::SetLastWriteTime'
29    condition: selection_ioc
30falsepositives:
31    - Legitimate admin script
32level: medium

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