> Ruiu said he arrived at the theory about badBIOS's high-frequency networking capability after observing encrypted data packets being sent to and from an infected laptop that had no obvious network connection with—but was in close proximity to—another badBIOS-infected computer. The packets were transmitted even when the laptop had its Wi-Fi and Bluetooth cards removed.
Observed how? If not a standard interface (i.e. disk, network, etc), using what? How could he know they were encrypted unless he intercepted a payload?
> With the speakers and mic intact, Ruiu said, the isolated computer seemed to be using the high-frequency connection to maintain the integrity of the badBIOS infection as he worked to dismantle software components the malware relied on.
What would be the point of this communication? It's BIOS would already need to be infected in order to be able to communicate via sound. The situation I can see this being useful is using another infected machine's Internet connection to download an OS specific payload, which makes some sense.