Malware which makes use of (even more) unexpected covert channels (than usual).

  audio badbios covert_channels infosec malware software ultrasound

Late last year, known and respected information security researcher Dragos Ruiu began tweeting about something he called #badBIOS - a malware agent of some kind that he says jacks the BIOS of a machine and sets itself up as a hypervisor-cum-backdoor beneath the operating system. He's gathered got some evidence that instances of the beastie communicate via near-ultrasound by directly manipulating the soundcard without interacting with the OS' drivers. Whether or not he's actually right, some of the NSA's older existing tools aside - it was surprising how fast corroborating details started popping up around the Net.

In December of 2013 …

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