T1123

Description from ATT&CK

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.(Citation: ESET Attor Oct 2019)

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.

Tests

Test #1 - Capture Audio

Capture audio using QuickTime Player

Input Arguments:

tell application "QuickTime Player"
 	activate
 	new audio recording
 	delay 2
 	tell front document
		start
		delay "3"
		stop
 	end tell
 	export front document in (POSIX file "/tmp/recording.m4a") using settings preset "Audio Only"
 	quit saving no
end tell

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Test #2 - Get microphone input volume

Gets the current microphone input volume through AppleScript, as seen in OSX.Leverage.

input volume of (get volume settings)

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Test #3 - Mute microphone input volume

Sets the microphone input volume to zero through AppleScript, as seen in OSX.Leverage.

set volume input volume 0

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References

• MITRE ATT&CK T1123
• Apple Script Language Guide