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Ars: Cross-Platform Malware Communicates With Sound

Posted by timothy on from the beep-beep-you're-dead dept.

An anonymous reader writes "Do you think an airgap can protect your computer? Maybe not. According to this story at Ars Technica, security consultant Dragos Ruiu is battling malware that communicates with infected computers using computer microphones and speakers." That sounds nuts, but it is a time-tested method of data transfer, after all.

2 of 245 comments (clear)

  1. And there's a whole series of comments at Ars... by NeverWorker1 · · Score: 5, Informative

    Explaining why the whole thing is probably a hoax.

  2. Re:And there's a whole series of comments at Ars.. by Tuidjy · · Score: 5, Informative

    I just tested my PC's speakers / microphone... The power output is rock steady up to 15kHz, then falls to 75% by 20kHz, 50% by 30kHz, and about 10% by 40kHz. Then it stays that way to fiftish kHz, which is as far as my loop went.

    I could already not hear it by 14kHz... damn I'm old. Last time I did something like this, I was OK up to 17kHz, and back at the Institute I was fine at 19kHz.

    I think that no one hear 30 kHz, and you still get 50% power on my PC... which is nothing special. You can definitely get decent communication outside of hearing range.

    --
    No good deed goes unpunished...