Researchers devised a new covert optical channel using which attackers can steal data from air-gapped computers without requiring network connectivity or physically contacting the devices. The new technique uses small changes in the brightness of the screen, which remains invisible to the naked eye, to covertly modulate binary information in morse-code patterns like morsese-like patterns. Researchers say the new technique could help hackers steal sensitive data from a compromised computer without the need to connect wirelessly or physically with other computers or network devices.
Source: https://thehackernews.com/2020/02/hacking-air-gapped-computers.html