Point-of-sale (PoS) malware BackOff leveraged in the recent intrusion on UPS systems in 51 locations across the US is estimated to impact more than 1,000 businesses.
Backoff is a recently discovered PoS malware, which is believed to have been employed in cyber-attacks on payment systems of various retailers since at least October 2013.
The Department of Homeland Security (DHS), issued an advisory on Friday, recommending retailers to evaluate their payment systems for signs of compromise.
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