” A Turkish man who led three cyberattacks against global financial institutions that caused more than $55 million in losses pleaded guilty Tuesday, prosecutors said.

Ercan Findikoglu, 34, whose online nicknames included “Segate,” ”Predator,” and “Oreon,” entered the plea in Brooklyn federal court.

Prosecutors said he used cashing crews worldwide to make fraudulent ATM withdrawals on a massive scale across the globe. In a February 2011 operation, Findikoglu’s cashing crews withdrew about $10 million through 15,000 fraudulent ATM withdraws in at least 18 countries, they said.

The government said he hacked into computer systems of three payment processing companies. It said he and co-conspirators accessed prepaid debit card accounts, inflated balances and removed their withdrawal limits between 2011 and 2013.

In a February 2013 attack, crews in 24 countries made 36,000 transactions, withdrawing about $40 million from ATMS, prosecutors said. During one operation, they added, crews in New York City withdrew approximately $2.4 million from nearly 3,000 ATM withdrawals during an 11-hour period.

His lawyer hasn’t commented.

In a release, U.S. Attorney Robert L. Capers called the cyberattacks massive.”

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