Possible Audio Capture (via auditd)

title: Possible Audio Capture (via auditd)
id: f079c7ef-d096-59f6-92e3-f994120b467c
status: stable
description: This rule detects attempts to record audio using the arecord and ecasound utilities.
references:
    - https://attack.mitre.org/techniques/T1123/
    - https://linux.die.net/man/1/arecord
    - https://linuxconfig.org/how-to-test-microphone-with-audio-linux-sound-architecture-alsa
    - https://manpages.debian.org/unstable/ecasound/ecasound.1.en.html
    - https://ecasound.seul.org/ecasound/Documentation/examples.html#fconversions
author: Huntrule Team
date: 2026-02-25
tags:
    - attack.collection
    - attack.t1123
logsource:
    product: linux
    service: auditd
detection:
    selection_execve:
        type: EXECVE
        a0: arecord
        a1: '-vv'
        a2: '-fdat'
    selection_syscall_memfd_create:
        type: SYSCALL
        exe|endswith: "/ecasound"
        SYSCALL: 'memfd_create'
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: low