Careful ATM users know enough to give a hasty visual check to the machine before using it and to hide the keyboard while entering their PIN.

Unfortunately, sometimes even that is not enough to prevent the fraudsters, and the worst part of it is that they continually think of new ways of stealing your credit and debit card data.

A type of attack that can't be detected by ATM users because there's nothing off on the machine or close enough to it to make them suspicious has been pointed out by Brian Krebs. According to him, criminals have devised a very clever tactic - one that is usually employed to steal the information from users who prefer to use the ATMs located in the antechamber of a bank or building lobby.