German Researchers at Fraunhofer Institute for Communication, Information Processing, and Ergonomics, say that a malware can transmit data using inaudible sounds.
It can steal confidential data or keystrokes using nothing more than a normal speakers and Microphones without any internet connection.
The researchers says it can be prevented by switching off audio I/O devices. Sometimes, we might need audio devices. In that case, the inaudible communication can be prevented "by application of a software-defined lowpass filter".
The researchers has described their idea in their paper entitled "On Covert Acoustical Mesh Networks in Air". You can find the research paper here.
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