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HAMBURG, GERMANY – ATMs are a thief’s gold mine. After all, it seems like an easy one-stop steal, doesn’t it? The only problem is that they’re just a little hard to pick up and go. But in Europe, hackers found an easier way.

They reportedly used USB sticks to install viruses into ATMs. That let them take over the machine’s system and they made the ATMs spit out cash.

The hackers struck last summer, but German researchers revealed the thefts during the Chaos Computing Congress last month in Hamburg, Germany.

Making ATMs spit out cash might be easy money, but it’s also an easy to land behind bars.