Security is about layers: physical, electronic/data, social. That's not the case if you neglect the physical security for the site. There's plenty of people that simply assume that "airgapped" means "no access from outside". This allows taking control of the LED blinking frequency, duration, and color.ĭon't immediately discount this work. The attack begins with planting on the target computer malware that contains a modified version of the firmware for the network card. The ETHERLED method can work with other peripherals or hardware that use LEDs as status or operational indicators like routers, network-attached storage (NAS) devices, printers, scanners, and various other connected devices.Ĭompared to previously disclosed data exfiltration methods based on optical emanation that take control of LEDs in keyboards and modems, ETHERLED is a more covert approach and less likely to raise suspicion. If an intruder infects them with specially crafted malware, they could replace the card driver with a version that modifies the LED color and blinking frequency to send waves of encoded data, Mordechai Guri has found. However, these systems work in air-gapped networks and still use a network card. critical infrastructure, weapon control units) that are isolated from the public internet for security reasons. Air-gapped systems are computers typically found in highly-sensitive environments (e.g.
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