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Detection rules › Sigma

Audio Capture via PowerShell

Status
test
Severity
medium
Log source
product windows, category process_creation
Author
E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community, Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects audio capture via PowerShell Cmdlet.

MITRE ATT&CK coverage

TacticTechniques
CollectionT1123 Audio Capture

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation
Security-AuditingEvent ID 4688A new process has been created.

Rule body yaml

title: Audio Capture via PowerShell
id: 932fb0d8-692b-4b0f-a26e-5643a50fe7d6
status: test
description: Detects audio capture via PowerShell Cmdlet.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1123/T1123.md
    - https://eqllib.readthedocs.io/en/latest/analytics/ab7a6ef4-0983-4275-a4f1-5c6bd3c31c23.html
    - https://github.com/frgnca/AudioDeviceCmdlets
author: E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community, Nasreddine Bencherchali (Nextron Systems)
date: 2019-10-24
modified: 2023-04-06
tags:
    - attack.collection
    - attack.t1123
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains:
            - 'WindowsAudioDevice-Powershell-Cmdlet'
            - 'Toggle-AudioDevice'
            - 'Get-AudioDevice '
            - 'Set-AudioDevice '
            - 'Write-AudioDevice '
    condition: selection
falsepositives:
    - Legitimate audio capture by legitimate user.
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains:
        - 'WindowsAudioDevice-Powershell-Cmdlet'
        - 'Toggle-AudioDevice'
        - 'Get-AudioDevice '
        - 'Set-AudioDevice '
        - 'Write-AudioDevice '

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
CommandLinematch
  • Get-AudioDevice
  • Set-AudioDevice
  • Toggle-AudioDevice
  • WindowsAudioDevice-Powershell-Cmdlet
  • Write-AudioDevice