can transmit information between computers using high-frequency sound waves inaudible to the human ear. The duo successfully sent passwords and more between non-networked Lenovo T400 laptops via the notebooks’ built-in microphones and speakers. Freaky-deaky! The infected victim sends all recorded keystrokes to the covert acoustical mesh network. Infected drones forward the keystroke information inside the covert network till the attacker is reached. ref: http://www.pcworld.com/article/2068525/researchers-create-malware-that-communicates-via-sound-no-network-needed.html