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Neiman Marcus Hackers Set Off 60,000 Alerts With Card Thefts

The hackers who raided the credit-card payment system of Neiman Marcus Group Ltd. set off alerts on the company’s security systems about 60,000 times as they slunk through the network, according to an internal company investigation.

The hackers moved unnoticed in the company’s computers for more than eight months, tripping hundreds of alerts daily over some of that period because their card-stealing software was deleted automatically each day from the Dallas-based retailer’s payment registers and had to be constantly reloaded. Card data was taken from July through October.