How “Fansmitter” Malware Steals Data from Air-Gapped Computers
One is to commandeer the computer’s built-in speakers and use them to send data ultrasonically to a nearby recording device, such as a mobile phone. Indeed, some security researchers claim to have seen exactly this kind of ultrasonic malware in the wild.
Thu Jun 30 13:31:05 2016 - permalink -
The best countermeasure for this kind of attack is obvious: remove the speakers. Without speakers to generate sound, a computer cannot leak data acoustically. Or so everyone thought.
Today, Mordechai Guri and pals at Ben-Gurion University in Israel say they’ve found another way to hack air-gapped computers, this time by commandeering the computer’s fan and modifying its rotation rate to control the sound it produces. They call this new approach a “fansmitter.”