IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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PowerShell Suspicious Script with Audio Capture Capabilities

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IMPORTANT: This documentation is no longer updated. Refer to Elastic's version policy and the latest documentation.

PowerShell Suspicious Script with Audio Capture Capabilities

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Detects PowerShell Scripts that can record audio, a common feature in popular post-exploitation tooling.

Rule type: query

Rule indices:

winlogbeat-*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://github.com/PowerShellMafia/PowerSploit/blob/master/Exfiltration/Get-MicrophoneAudio.ps1

Tags:

Elastic
Host
Windows
Threat Detection
Collection

Version: 1

Added (Elastic Stack release): 7.16.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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event.code:"4104" and powershell.file.script_block_text : (
Get-MicrophoneAudio or (waveInGetNumDevs and mciSendStringA) )

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Collection
- ID: TA0009
- Reference URL: https://attack.mitre.org/tactics/TA0009/
Technique:
- Name: Audio Capture
- ID: T1123
- Reference URL: https://attack.mitre.org/techniques/T1123/
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/

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