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New PIXHELL acoustic attack leaks secrets from LCD screen noise


Jasper_The_Rasper
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September 10, 2024 By Bill Toulas

 

New PIXHELL acoustic attack leaks secrets from LCD screen noise

A novel acoustic attack named ‘PIXHELL’ can leak secrets from air-gapped and audio-gapped systems, and without requiring speakers, through the LCD monitors they connect to.

In a PIXHELL attack, malware modulates the pixel patterns on LCD screens to induce noise in the frequency range of 0-22 kHz, carrying encoded signals within those acoustic waves that can be captured by nearby devices such as smartphones.

PIXHELL attack setting
PIXHELL attack setting
Source: Arxiv.org

The researchers' tests showed that data exfiltration is possible at a maximum distance of 2 meters (6.5 ft), achieving a data rate of 20 bits per second (bps).

While this is too slow to make large file transfers practical, real-time keylogging and stealing small text files that might contain passwords or other information are still possible.

 

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