title: Clear PowerShell History - PowerShell Module
id: f99276ad-d122-4989-a09a-d00904a5f9d2
related:
    - id: dfba4ce1-e0ea-495f-986e-97140f31af2d
      type: derived
status: test
description: Detects keywords that could indicate clearing PowerShell history
references:
    - https://gist.github.com/hook-s3c/7363a856c3cdbadeb71085147f042c1a
author: Ilyas Ochkov, Jonhnathan Ribeiro, Daniil Yugoslavskiy, oscd.community
date: 2019-10-25
modified: 2022-12-02
tags:
    - attack.stealth
    - attack.t1070.003
logsource:
    product: windows
    category: ps_module
    definition: 0ad03ef1-f21b-4a79-8ce8-e6900c54b65b
detection:
    selection_1a_payload:
        Payload|contains:
            - 'del'
            - 'Remove-Item'
            - 'rm'
    selection_1b_payload:
        Payload|contains: '(Get-PSReadlineOption).HistorySavePath'
    selection_payload_2:
        Payload|contains|all:
            - 'Set-PSReadlineOption'
            - '–HistorySaveStyle'  # not sure if the homoglyph –/- is intended, just checking for both
            - 'SaveNothing'
    selection_payload_3:
        Payload|contains|all:
            - 'Set-PSReadlineOption'
            - '-HistorySaveStyle'
            - 'SaveNothing'
    condition: 1 of selection_payload_* or all of selection_1*
falsepositives:
    - Legitimate PowerShell scripts
level: medium