Researchers at security firm Duo have tweaked an AMD Radeon Pro WX3100 graphics card as a radio transmitter to transmit data without having to physically modify the hardware in any way.
They did this by manipulating the graphics card’s shader clock rates to become a tunable radio device which they then used to steal data from an air-gapped PC that was behind a wall 50 feet away.
This is an example of a side-channel attack that steals data by manipulating and then observing external indicators such as blinking lights or fan vibrations on a user’s PC. What makes these kinds of attacks so dangerous is the fact that since the hardware is working as designed, it is not detectable by antivirus scanners or any other security software.
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https://www.techradar.com/news/amd-gpu-turned-into-zombie-by-security-boffins-to-siphon-data-from-air-gapped-pc
