The most common of these off-ATM skimmers can be found near cash machines that are located in the antechamber of a bank or building lobby, where access is controlled by a key card lock that is activated when the customer swipes his or her ATM card. In these scams, the thieves remove the card swipe device attached to the outside door, add a skimmer, and then reattach the device to the door. The attackers then place a hidden camera just above or beside the ATM, so that the camera is angled to record unsuspecting customers entering their PINs.
The crooks usually return later in the evening to remove the theft devices. Armed with skimmed card data and victim PINs, skimmer thieves are able to encode the information onto counterfeit cards and withdraw money from compromised accounts at ATMs across the country.