Security experts said more retailers could be affected by the massive cyber scam at Target stores and not even know it yet.
Millions of other shoppers who didn't even think they were part of that original credit card scam at Target received an e-mail on Thursday letting them know that not only credit card numbers, but personal information like names and emails may be compromised.
Now it turns out those warnings could end up coming from more stores than originally thought.
Experts said that security breach at Target over the holidays was part of a broader, highly sophisticated scam, potentially affecting a large number of retailers. The problem is that the scam includes malware that covers its tracks.
The president of the firm working with the federal government that made the discovery spoke with CBS News and said some stores may not even know yet they've been hit.
"What's unique about it is it's the first time we've seen this attack at this scale and sophistication in terms of the overall operation of cyber criminal," the expert said.
Instructions have been sent out to let retailers know how to find and stop the scam.
Sources told CBS News the theft at Target helped investigators track and identify the malware.
Around 40 million Target customers had their credit and debit card accounts compromised, and the personal information of as many as 70 million shoppers was stolen as well, including e-mail addresses and names.
Forbes Magazine reported that the breach could include your personal information from purchases you made nearly a decade ago. Experts said that the best thing you can do now is to keep an eye on your bank accounts and credit reports.
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