How a malware can steal the data from an infected system that doesn't have internet connection? You might think it is impossible. Computer scientists say it is possible.
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.
Security researchers often suggest not to connect the system that has sensitive data to Internet so that cyber criminals can't reach them. But now, It can steal from audio sounds without network connection. So what now?! Then, Let us remove the audio devices.
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.
(h/t: Ars Technica)