A recent dump of payment card information being sold on a popular online fraud marketplace suggests that more than 30 million payment cards may have been affected by a malware attack and data breach at Wawa convenience stores and gas stations that was first revealed in December. The Joker’s Stash marketplace–one of the largest and most notorious dark web marketplaces for buying stolen payment card data—began uploading card data Monday from a major breach dubbed “BIGBADABOOM—III,” researchers from New York-based fraud intelligence company Gemini Advisory revealed in a report.

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