After Target breach, Homeland Security warns retailers

Investigators probing the recent holiday season cyberattack are warning retailers about sophisticated malware that potentially affected a large number of stores.

A homeland security official said Thursday that the malware is described in a government report that has been distributed to retailers.

The warning follows a massive breach at Target that compromised credit card numbers and other personal information on up to 110 million customers.

A private firm working on the investigation, iSIGHT Partners, said the hackers behind the malware "displayed innovation and a high degree of skill in orchestrating the various components of the activity. "

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