Ben Tedesco of the cybersecurity company Carbon Black found an ATM skimmer while he was on vacation in Vienna, Austria.
A skimmer is a card reader that fits over an ATM card slot. It scans and records the information on the magnetic strip. Some skimmers have little built-in cameras to record card holders' pins as they enter it on the ATM keypad. If not, the sleazy criminal will mount a video camera nearby, or even install a counterfeit keypad.
From YouTube description:
While on vacation with my family in Vienna, Austria I went to grab some cash from an ATM, being security paranoid I went repeated my typical habit of checking the card reader as I have 100's of times… today's the day when my security awareness paid off! Check out how perfectly made this skimmer is that was custom made for this ATM MACHINE!