Hackers have hacked ATMs in Europe using USB sticks to install code on cash dispensers. The code was installed on four ATMs and could be run again without the need to be hacked. Hackers were able to see how much money was available in the machine, by denomination and how much each note could be dispensed. There was even a built-in security feature to the code, which meant that the criminal at the cash point had to call another gang member for a numerical code to input before they could grab the notes.”]
Source: https://gizmodo.com/crooks-have-been-hacking-atms-with-infected-usb-sticks-1492128284