This hack makes an USB drive to transmit your secrets in a way a nearby radio can receive it.
Technique works on virtually all USB drives with no modifications necessary.
“We introduce a software-only method for short-range data exfiltration using electromagnetic emissions from a USB dongle,”
The software works on just about any storage device that’s compliant with the USB 2.0 specification. Some USB devices such as certain types of cameras that don’t receive a stream of bits from the infected computer, aren’t suitable. USBee transmits data at about 80 bytes per second, fast enough to pilfer a 4096-bit decryption key in less than 10 seconds.
Radio signal are read by a GNU-radio-powered receiver and demodulator 26 feet away.
As a result, an already-compromised computer can leak sensitive data even when it has no Internet or network connectivity, no speakers, and when both Wi-Fi and Bluetooth have been disabled.
For more details read the science paper: USBee: Air-Gap Covert-Channel via Electromagnetic Emission from USB