Israeli researchers proposed a new method that enables attackers to steal data acoustically from air-gapped systems. Malware that exploits computer power supply unit (PSU) to play sounds and use them as a secondary speaker. The malware in the infected computer gathers sensitive data such as files, keystroke logging, credentials, encryption keys and transfer them using the acoustic sound waves emitted by the computers power supply. By using the attack method attackers can play audio streams from a computer even when audio hardware is disabled and speakers are not present.”]