Ally Bank has reported an increase in stolen debit card numbers that are draining funds from customer bank accounts. A source that is close to the fraud department reported that there has been an increase in scripting attacks. The attackers are using smaller online marketplaces to run scripts and brute-force card numbers. By using the known BINs (Bank Identification Numbers) on these cards, which are the first four to six digits, the attacker is able to brute-force the final digits on the cards until it becomes possible to make a small purchase on the e-commerce site. Once a valid card number is identified, the threat actor can begin to use it to make larger purchases.
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