This is not the most common or efficient way of leaking data, but an article from Tripwire states that researches at Ben-Gurion University in Israel have once again detailed an imaginative way to exfiltrate information from an air-gapped computer.
You may know, or not, that there have been many attempts in the past to exfiltrate data from a computer without having physical access to it, and this one is through the brightness of the computer screen.
You know that the computer screen changes very quickly, and this change is imperceptible by the human eye. However, this paper shows how to collect data being sent by the manipulation of the screen’s brightness – by malware pre-installed on the computer.
As you can see, there is something already on the computer, a malware, and this malware is the one “transmitting” that information through the screen.
If you want to know more about how this works, simply watch this video!
And as always, be safe out there and until the next Malware Monday.