Some customers of The UPS Store may have had their credit and debit card information exposed by a computer virus found on systems at 51 stores in 24 states.

A spokesman for UPS said the information includes names, card numbers and postal and e-mail addresses from about 100,000 transactions between Jan. 20 and Aug. 11.

United Parcel Service said Wednesday that it was among U.S. retailers who got a Department of Homeland Security bulletin about the malware on July 31.

The company said it is not aware of any fraud related to the attack, spokesman Chelsea Lee said.

Atlanta-based UPS said it hired a security firm that found the virus in systems at about 1 percent of the company’s 4,470 franchised locations.