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In this paper, we show that attackers can exfiltrate data from air-gappedcomputers via Wi-Fi signals. Malware in a compromised air-gapped computer cangenerate signals in the Wi-Fi frequency bands. The signals are generatedthrough the memory buses - no special hardware is required. Sensitive data canbe modulated and secretly exfiltrated on top of the signals. We show thatnearby Wi-Fi capable devices (e.g., smartphones, laptops, IoT devices) canintercept these signals, decode them, and send them to the attacker over theInternet. To extract the signals, we utilize the physical layer informationexposed by the Wi-Fi chips. We implement the transmitter and receiver anddiscuss design considerations and implementation details. We evaluate thiscovert channel in terms of bandwidth and distance and present a set ofcountermeasures. Our evaluation shows that data can be exfiltrated fromair-gapped computers to nearby Wi-Fi receivers located a distance of severalmeters away.

AIR-FI: Generating Covert Wi-Fi Signals from Air-Gapped Computers