United Parcel Service Inc. said Wednesday that it was among U.S. retailers who got a Department of Homeland Security bulletin about the malware on July 31. The malware is not identified by current anti-virus software.
The company is not aware of any fraud related to the attack, spokeswoman 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. At many stores, the intrusion did not begin until March or April.
Lee said that the problem was fixed by Aug. 11 and the company took additional steps to protect systems at other stores. She said the affected stores were not linked electronically, and UPS is still investigating how they were compromised.
The Associated Press contributed to this report.
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