Audio Capture
Where this stands
One published detection covers this technique. Every one is unverified — no rule on Siemphony has been executed against real telemetry.
What the technique is
An adversary can leverage a computer's peripheral devices (e.g., microphones and webcams) or applications (e.g., voice and video call services) to capture audio recordings for the purpose of listening into sensitive conversations to gather information. Malware or scripts may be used to interact with the devices through an available API provided by the operating system or an application to capture audio. Audio files may be written to disk and exfiltrated later.
Read it on attack.mitre.orgWhat MITRE says you would watch
- AN0619
Unusual or unauthorized processes accessing microphone APIs (e.g., winmm.dll, avrt.dll) followed by audio file writes to user-accessible or temp directories.
- AN0620
Processes accessing ALSA/PulseAudio devices or executing audio capture binaries like 'arecord', followed by file creation or suspicious child process spawning.
- AN0621
Processes invoking AVFoundation or CoreAudio frameworks, accessing input devices via TCC logs or Unified Logs, followed by writing AIFF/WAV/MP3 files to disk.
Technique names and descriptions © MITRE ATT&CK®, CC BY 4.0. Not endorsed by MITRE.