In November, authorities uncovered a global ATM scam that allegedly netted more than $9 million. According to the FBI, the attackers compromised prepaid payroll cards from RBS WorldPay and gift cards, launching a coordinated attack against more than 130 ATMs in 49 cities around the world.

The cards were exploited by “cashers” who withdrew money during a single 30-minute window. If the preliminary findings of the FBI turn out to be true, this could represent one of the most organized attacks in cybercrime history.