sigmalowHunting

Audio Capture

Detects attempts to record audio using the arecord and ecasound utilities.

MITRE ATT&CK

collection

Detection Query

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_*

Author

Pawel Mazur, Milad Cheraghi

Created

2021-09-04

Data Sources

linuxauditd

Platforms

linux

References

Tags

attack.collectionattack.t1123

Raw Content

title: Audio Capture
id: a7af2487-9c2f-42e4-9bb9-ff961f0561d5
status: test
description: Detects attempts to record audio using the arecord and ecasound utilities.
references:
    - 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: Pawel Mazur, Milad Cheraghi
date: 2021-09-04
modified: 2025-12-05
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