Powershell Keylogging

Description

Adversaries may log user keystrokes to intercept credentials as the user types them.

Query · sigma

selection_basic:
  ScriptBlockText|contains: Get-Keystrokes
selection_high:
  ScriptBlockText|contains|all:
  - Get-ProcAddress user32.dll GetAsyncKeyState
  - Get-ProcAddress user32.dll GetForegroundWindow
condition: 1 of selection_*

Known false positives

  • Unknown
Raw source Powershell Keylogging · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Powershell Keylogging
id: 34f90d3c-c297-49e9-b26d-911b05a4866c
status: test
description: Adversaries may log user keystrokes to intercept credentials as the user types them.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218/T1218.md
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1056.001/src/Get-Keystrokes.ps1
author: frack113
date: 2021-07-30
modified: 2022-07-11
tags:
    - attack.credential-access
    - attack.collection
    - attack.t1056.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_basic:
        ScriptBlockText|contains: 'Get-Keystrokes'
    selection_high: # want to run in background and keyboard
        ScriptBlockText|contains|all:
            - 'Get-ProcAddress user32.dll GetAsyncKeyState'
            - 'Get-ProcAddress user32.dll GetForegroundWindow'
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: medium

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