The report from Pangu Lab delves into malware that its researchers first encountered in 2013 during an investigation into a hack against “a key domestic department.” At the time, the researchers couldn’t figure out who was behind the hack, but then, thanks to leaked NSA data about the hacking group Equation Group—widely believed to be the NSA—released by the mysterious group Shadow Brokers and by the German magazine Der Spiegel, they connected the dots and realized it was made by the NSA, according to the report.

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