MOSQUITO is a new technique devised by a team of researchers at Israels Ben Gurion University to exfiltrate data from an air-gapped network. The technique uses speakers, headphones, or earphones to acquire the sound from surrounding environment by exploiting a specific audio chip feature. The Israeli team demonstrated that separating the computer networks from the Internet is not enough to protect them from attackers. In the past, the same group of researchers demonstrated that it possible to listen to private conversations by reversing headphones connected to a previously infected computer.”]
Source: https://securityaffairs.co/wordpress/70192/hacking/mosquito-attack-airgapped-networks.html