Neiman Marcus missed almost 60,000 security alerts about the recent hack

One month after Neiman Marcus was struck by a massive credit card hack, a new report published by Businessweek sheds more light into the breach. Among the revelations: The company apparently missed almost 60,000 security alerts about the hack. According to an internal investigation by the high-end retailer, hackers infiltrated Neiman Marcus’s computer system on March 5, 2013. Four months later, malware began stealing user information from Neiman Marcus stores around the country.

Remember how Neiman Marcus revealed that hackers accessed credit card info for brick-and-mortar store customers? Turns out, during the eight-month period when hackers were snooping around the company’s system, they set off nearly 60,000 security alerts. That seems like a lot of pop-ups to casually dismiss. BloombergBusinessweek says the internal company investigation into the hacking attack reveals that the card-stealing software hackers used was automatically deleted from the point-of-sale payment register system at the end of each day, sometimes triggering hundreds of alerts in the process. After four months of lurking, hackers were able to steal credit card data undetected from July through October of 2013.