In early June the U.S. Department of Justice revealed that the Gameover Zeus (GOZ) botnet had been disabled thanks to the success of a joint effort dubbed “Operation Tovar.” The celebration appears to have been premature, though, as security researchers have already discovered a resurgence of Gameover malware infections.

While the Gameover botnet has lain dormant since the takedown, a new massive spam campaign has Sophos Labs researcher James Wyke concerned the threat has returned. A blog post reveals details of why it seems to be part of the same malware family.

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