The cult of Edward Snowden will not be pleased with the news of a new malware, developed by a team of Israeli researchers, that can acquire data through the sound generated by the cooling fans installed inside a computer.
The team in Israel's Ben Gurion University demonstrate the malware can work even on computers that are isolated or 'air-gapped'. The malware controls and listens to the speed of the fans, and does not require a speaker, camera or any other hardware.
It transmits the data through Morse code to up to an 8 meter radius, for a smart phone to pick up the signals effectively and convert them into usable data.
But for it to work, the malware has to be manually installed on the isolated computer, using an external storage device. Once let loose inside the system, it locates data on the computer and transmits them by controlling the CPU and the cooling fans. The acoustic waveforms that are generated, usually ignored by the user, can be picked up by a nearby listening device.
Also, since it's just morse code, transmitted in speeds of about 900 bit per hour, hackers can't really do much with the information. Large chunks of data will not be possible to transmit. But it's just about enough to steal the passwords and encryption keys.
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