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Dexter is a computer virus or point of sale malware which infects computers running Microsoft Windows and was discovered by IT security firm Seculert, in December 2012. It infects PoS systems worldwide and steals sensitive information such as Credit Card and Debit Card information.
In December 2013, researchers discovered StarDust, a major revision of Dexter, which compromised 20,000 cards in active campaign hitting US merchants. It was one of the first known botnets to target point-of-sale (PoS) terminals used by stores and restaurants to process customers' credit and debit card payments.