Israel’s Ben Gurion University has developed two techniques that helped them exfiltrate data from computers placed inside a Faraday cage. Both the techniques make use of proof-of-concept (PoC) malware installed on an air-gapped computer inside the cage to control the “magnetic fields emanating from the. computer by regulating the. CPU’s workloads, which can be. achieved by. regulating the CPU with calculations that increase. power and generate a stronger electromagnetic field that. increases a stronger. electromagnetic field (acoustic and thermal emissions) generated by optical. emissions,. thermal emissions, thermal emissions and thermal. emissions.
Source: https://thehackernews.com/2018/02/airgap-computer-hacking.html