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Retailers Hit by Credit-Data Breach Smaller Than Target’s

Ukrainian hackers have attacked several dozen small- and medium-sized U.S. retailers in data raids that appear to be smaller and less sophisticated than the ones that hit Target Corp. and Neiman Marcus Group Ltd., according to a cybersecurity firm.

RSA Security LLC discovered the theft when it found a large cache of stolen data on a server used by the hackers, according to an analysis posted on the company’s website today. The breach, which started Oct. 25 and continued into last week, affected at least 41 companies, including one medium-sized retailer and several gas station chains, said an RSA executive, who asked not to be named because the details are confidential. The hackers compromised credit-card data for about 50,000 customers, the executive said.