A rogue USB charging cable named USBHarpoon can be used to compromise a computer in just a few seconds. The cable was modified to allow both data and power to pass through, in this way it is impossible for a victim to note any suspicious behavior. The attack is any way visible to the owner of the machine, for this reason, to make the attack stealth it is necessary to devise a method to hide the interaction with the system, for example, to run the attack when the victim is not around the machine.”]
Source: https://securityaffairs.co/wordpress/75644/uncategorized/usbharpoon-attack.html