Windows PowerShell Keylogger Function Reference in Script Block Logging

ATT&CK techniques

Cred Access → Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1056.001Keylogging
Discovery
Lateral Movement
Collection
- T1056.001Keylogging
C2
Exfiltration
Impact

What it detects

This rule flags PowerShell script text that includes a specific reference to keyboard state checks using [Windows.Input.Keyboard]::IsKeyDown with [System.Windows.Input.Key]. Such code can be used by keyloggers to capture or infer user keystrokes. It relies on Script Block Logging telemetry capturing the script content processed by PowerShell.

Reporting behind it

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Windows PowerShell Keylogger Function Reference in Script Block Logging

Pivot detection · T1056.001 · 9 related

Changelog

v2

v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

powershell-script-keylogger-indicators-via-keyboard-state-references-windows-965e2db9

title: Windows PowerShell Keylogger Function Reference in Script Block Logging
id: 0b5d2ccc-0d6f-455d-a7cf-b6b11f175977
status: test
description: This rule flags PowerShell script text that includes a specific reference to keyboard state checks using [Windows.Input.Keyboard]::IsKeyDown with [System.Windows.Input.Key]. Such code can be used by keyloggers to capture or infer user keystrokes. It relies on Script Block Logging telemetry capturing the script content processed by PowerShell.
references:
  - https://twitter.com/ScumBots/status/1610626724257046529
  - https://www.virustotal.com/gui/file/d4486b63512755316625230e0c9c81655093be93876e0d80732e7eeaf7d83476/content
  - https://www.virustotal.com/gui/file/720a7ee9f2178c70501d7e3f4bcc28a4f456e200486dbd401b25af6da3b4da62/content
  - https://learn.microsoft.com/en-us/dotnet/api/system.windows.input.keyboard.iskeydown?view=windowsdesktop-7.0
  - https://github.com/SigmaHQ/sigma/blob/master/rules/windows/powershell/powershell_script/posh_ps_susp_keylogger_activity.yml
author: Nasreddine Bencherchali (Nextron Systems), Huntrule Team
date: 2023-01-04
tags:
  - attack.collection
  - attack.credential-access
  - attack.t1056.001
logsource:
  product: windows
  category: ps_script
  definition: "Requirements: Script Block Logging must be enabled"
detection:
  selection:
    ScriptBlockText|contains: "[Windows.Input.Keyboard]::IsKeyDown([System.Windows.Input.Key]::"
  condition: selection
falsepositives:
  - Unknown
level: medium
license: DRL-1.1
related:
  - id: 965e2db9-eddb-4cf6-a986-7a967df651e4
    type: derived

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