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Mar 13, 2023

CASPER attack steals data using air-gapped computer’s internal speaker

Posted by in categories: cybercrime/malcode, mobile phones

Researchers at the School of Cyber Security at Korea University, Seoul, have presented a new covert channel attack named CASPER can leak data from air-gapped computers to a nearby smartphone at a rate of 20bits/sec.

The CASPER attack leverages the internal speakers inside the target computer as the data transmission channel to transmit high-frequency audio that the human ear cannot hear and convey binary or Morse code to a microphone up to 1.5m away.

The receiving microphone can be in a smartphone recording sound inside the attacker’s pocket or a laptop in the same room.

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