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Israeli researchers use RAM as a small Wi-Fi transmitter to leak sensitive data from isolated systems


The latest in a series of unorthodox methods uncovered over the years
on December 20, 2020, 6:56
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Why it matters: Air-gapped computers, usually found in government, banking, enterprise, industrial and military setups, operate in tightly controlled environments, cut-off from the internet and under strict supervision. You d normally think they re safe from information leaks, however an Israeli security research team has proven once again that all it takes is some creativity.
Earlier this year, a group of Israeli security researchers at the Ben Gurion University revealed novel ways in which hackers can exploit physically isolated systems to leak sensitive information. One involved manipulating display brightness to alternate between two levels for sending zeroes and ones, another was about carefully tuning the speed of the cooling fans inside a PC to create tiny vibrations that could be picked up by the accelerometer on ....

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RAM-Generated Wi-Fi Signals Allow Data Exfiltration From Air-Gapped Systems


By Ionut Arghire on December 16, 2020
Covert Wi-Fi signals generated by DDR SDRAM hardware can be leveraged to exfiltrate data from air-gapped computers, a researcher claims.
In a newly published paper, Mordechai Guri from the Ben-Gurion University of the Negev in Israel details AIR-FI, a new data exfiltration technique in which malware installed on a compromised air-gapped system can generate Wi-Fi signals that a nearby device intercepts and sends to the attacker, over the Internet.
The technique leverages memory buses for the generation of covert signals, thus eliminating the need of Wi-Fi hardware. For the interception of these signals, Wi-Fi capable devices such as smartphones, IoT devices, and laptops are used. ....

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How to leak data via Wi-Fi when there's no Wi-Fi chip: Boffin turns memory bus into covert data transmitter


Another nail in the coffin of assuming that airgapped means secure
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Mordechai Guri, an Israeli cyber security researcher who focuses on covert side channel attacks, has devised yet another way to undermine air gapping – the practice of keeping computers disconnected from any external network for the sake of security.
In a newly released working paper [PDF], AIR-FI: Generating Covert Wi-Fi Signals from Air-Gapped Computers, Guri, head of research and development at Ben-Gurion University of the Negev, Israel s Cyber-Security Research Center, describes a technique for turning DDR SDRAM buses into transmitters that can spew sensitive data.
The technique is envisioned as part of the elaborate attack chain required to compromise highly secure systems that are isolated from public networks. ....

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