The firm that uncovered the breach, Hold Security of Milwaukee, said a group of about 20 hackers from south-central Russia are to blame. The group, dubbed “CyberVor” (“vor” meaning “thief” in Russian), stole data from thousands of businesses Web sites, both small and large, and even from personal Web sites.
At the Times’s request, a security expert not affiliated with Hold analyzed the database of stolen information and confirmed its authenticity.
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