Three years after BlackEnergy’s unprecedented cyberattack on Ukraine’s power grid caused a massive blackout in Kiev, an offshoot of the group continues to pose a clear and present danger to critical infrastructure organizations in Central and Eastern Europe. Security vendor ESET has been tracking the subgroup, which it named GreyEnergy, since soon after BlackEnergy and its eponymously named malware dropped out off sight following the December 2015 Ukraine attack.

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