Russia GRU military intelligence agency has carried out many of the most aggressive acts of hacking in history: destructive worms, blackouts, and—closest to home for Americans—a broad hacking and leaking operation designed to influence the outcome of the 2016 US presidential election. Now it appears the GRU has been hitting US networks again, in a series of previously unreported intrusions that targeted organizations ranging from government agencies to critical infrastructure. From December...

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