I like to think I’m fairly competent with computers but I don’t understand how this is a thing. see https://www.mitnicksecurity.com/blog/the-latest-malware-threat-the-usb-ninja-cable
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Basically computer chips can be very small nowadays and you can hide a chip in what looks like the end of a regular USB cable.
You can have that chip pretend to be anything else you normally connect via USB including a USB keyboard or a USB drive.
Since USB is build up around the idea of hubs and connecting multiple devices over a single plug, there is nothing preventing such a fake cable from doing the normal thing people expect it do do and at the same doing its hidden trick.
The chip on there might simply notice when it gets connected to a computer and do nothing for a while. Later it blindly fires of keystrokes like [Windows]+[r] followed by [c],[m],[d] and [ENTER] and have a command line open that it then simply types some script into.
Once you have access to them command line you can do all sorts of things like downloading additional code to run form the internet.
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