March 25, 2014
Last week I shared the Business Week article that explains how Target stores were breached and credit and debit card information was stolen. This week I found a similar article on the breach at Neiman Marcus stores.
It is almost certain that the Neiman Marcus breach was made by a different group of hackers than those who made the Target breach because of the different method and code style used. According to the investigation, card data was stolen from July through October, 2013. The number of cards exposed is less than 350,000, a much smaller number than first estimated.
Similar to the Target attack, the hackers moved unnoticed in the company’s computers for several months, sometimes tripping hundreds of alerts daily. While the anomalous behavior was logged on the company’s centralized security system, it did not recognize the code as malicious, or expunge it. It is unclear why the alerts weren’t investigated at the time.
According to the investigative report, Neiman Marcus was in compliance with standards meant to protect transaction data when the attack occurred. Data-security requirements were tightened again this year after a rash of thefts that also included Target and Michaels Stores.