https://wccftech.com/evil-maid-attack-firmware-backdoor/

We have seen several stories of journalists, politicians and other targets talking about having their machines hacked inside hotel rooms. These type of attacks (known as an “evil maid attack) are so popular for scenarios where attackers have physical access to the device that Edward Snowden went ahead to create a free tool to secure your devices when you have to leave your devices in a hotel room, even if for just a few minutes.

These attacks don’t need a lot of time since anyone with physical access, the right tools, and some skills can break into a room to install a malware that is nearly impossible to detect. In an effort to raise awareness around the issue, security researchers have shared a demo video showing how easy these attacks are to pull off.