A hacker who once advertised having access to user information for websites such as Facebook and Twitter has been linked to the theft of a record 1.2 billion Internet credentials, the FBI wrote in court documents. The hacker, known as “mr.grey,” was identified based on data from Milwaukee-based cybersecurity firm Hold Security, the documents said. The papers, made public last week by a federal court in Milwaukee, provide a window into the FBI’s investigation of what would amount to the largest collection of stolen user names and passwords. The court papers were filed in support of a search warrant the FBI sought in December. That warrant, related to email records, was executed a month later. The FBI began investigating when Hold Security announced last year that it had information on a Russian hacker group it dubbed CyberVor, which the firm said had stolen the 1.2 billion credentials and more than 500 million email addresses. The FBI subsequently found lists of domain names and utilities that investigators believe were used to send spam, the documents said. Amid the spam utilities, the FBI discovered an email address registered in 2010 for “mistergrey,” documents show. A search of Russian hacking forums by the […]
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