Sigma rule: Audio Capture

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-c7a553b4aa07, updated 2025-12-05T00:00:00.000Z.

Rule

Title
Audio Capture
Status
test
Level
low
Author
Pawel Mazur, Milad Cheraghi
Date
2021-09-04
Modified
2025-12-05
File
rules/linux/auditd/lnx_auditd_audio_capture.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

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_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.collection
  • attack.t1123

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/auditd/lnx_auditd_audio_capture.yml

Sources and licences

  • SigmaHQ

    "Audio Capture" by Pawel Mazur, Milad Cheraghi (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/auditd/lnx_auditd_audio_capture.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Audio Capture",
entity page, dataset version ref-c7a553b4aa07, updated 2025-12-05T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a7af2487-9c2f-42e4-9bb9-ff961f0561d5 (accessed 2026-11-03).
Underlying source: SigmaHQ rule a7af2487-9c2f-42e4-9bb9-ff961f0561d5, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.