ETHERLED: Air-gapped systems leak data via network card LEDs

Have you heard of Etherled? A newly-discovered method of exfiltrating data from air-gapped systems.

"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... "

https://www.bleepingcomputer.com/news/security/etherled-air-gapped-systems-leak-data-via-network-card-leds/?s=09