Researchers have revealed how cyber thieves hacked into cash machines in order to infect them with malware earlier this year.
Criminals cut holes in the machines in order to plug in USB drives that installed their code onto the ATM's.
Once the malware had been transferred, they patched up the holes, allowing some machines to be targeted several times.
Details of the attacks were presented in Hamburg, Germany at the hacker - themed Chaos Computing Congress.
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