ETHERLED: Sending Covert Morse Signals from Air-Gapped Devices via Network Card (NIC) LEDs. (arXiv:2208.09975v1 [cs.CR])

Highly secure devices are often isolated from the Internet or other public
networks due to the confidential information they process. This level of
isolation is referred to as an 'air-gap .'

In this paper, we present a new technique named ETHERLED, allowing attackers
to leak data from air-gapped networked devices such as PCs, printers, network
cameras, embedded controllers, and servers. Networked devices have an
integrated network interface controller (NIC) that includes status and activity
indicator LEDs. We show that malware …

air-gapped card covert devices etherled network