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Businesses of all sizes need to “proactively check...

Businesses of all sizes need to “proactively check for possible Point of Sale (PoS) malware infections,” particularly the bug known as “Backoff” malware, said a joint advisory Friday from the Department of Homeland Security and the U.S. Secret Service. Backoff was identified in October 2013, but wasn’t recognized by antivirus software until this month, it said. The advisory estimated Backoff has affected more than 1,000 businesses, many of which don’t know they've been compromised, it said. Seven PoS providers have confirmed that their clients have been affected, it said.