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The Hacker News - Most Trusted Cyber Security and Computer Security Analysis: Air-Gap Network

Air-Gapped Devices Can Send Covert Morse Signals via Network Card LEDs

Air-Gapped Devices Can Send Covert Morse Signals via Network Card LEDs

August 24, 2022Ravie Lakshmanan
A security researcher who has a long line of work demonstrating novel data exfiltration methods from air-gapped systems has come up with yet another technique that involves sending Morse code signals via LEDs on network interface cards ( NICs ). The approach, codenamed  ETHERLED , comes from Dr. Mordechai Guri , the head of R&D in the Cyber Security Research Center in the Ben Gurion University of the Negev in Israel, who recently outlined  GAIROSCOPE , a method for transmitting data ultrasonically to smartphone gyroscopes. "Malware installed on the device could programmatically control the status LED by blinking or alternating its colors, using documented methods or undocumented firmware commands," Dr. Guri said. "Information can be encoded via simple encoding such as Morse code and modulated over these optical signals. An attacker can intercept and decode these signals from tens to hundreds of meters away." A network interface card, also known as a netwo
New Air-Gap Attack Uses MEMS Gyroscope Ultrasonic Covert Channel to Leak Data

New Air-Gap Attack Uses MEMS Gyroscope Ultrasonic Covert Channel to Leak Data

August 23, 2022Ravie Lakshmanan
A novel data exfiltration technique has been found to leverage a covert ultrasonic channel to leak sensitive information from isolated, air-gapped computers to a nearby smartphone that doesn't even require a microphone to pick up the sound waves. Dubbed  GAIROSCOPE , the adversarial model is the latest addition to a long list of  acoustic, electromagnetic, optical, and thermal approaches  devised by Dr. Mordechai Guri , the head of R&D in the Cyber Security Research Center in the Ben Gurion University of the Negev in Israel. "Our malware generates ultrasonic tones in the resonance frequencies of the  MEMS gyroscope ," Dr. Guri said in a  new paper  published this week. "These inaudible frequencies produce tiny mechanical oscillations within the smartphone's gyroscope, which can be demodulated into binary information." Air-gapping is seen as an  essential security countermeasure  that involves isolating a computer or network and preventing it from es
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