Target's TGT horrendous data breach was not over when the company had originally announced that it was.
Target CFO John Mulligan said the company has learned software on another 25 checkout machines continued to steal payment card data three days after December 15, the date by which the discounter had said the malware was removed from its system, in testimony submitted to the Senate Judiciary Committee.
Related: Target Set To Lead The Way On Chip And Pin Credit Card Technology
Target's system was breached when the hackers used stolen vendor credentials to slip the malware inside, Target said. The thieves took personal information like email addresses and phone numbers for as many as 70 million people, in addition to the card data
Target is spending $100 million to upgrade its payment system to cards that are based on computer chips, by early 2015, which is about six months earlier than was earlier planned.
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