Quote:Security researchers warn of cyber-espionage activity by group which has links to some of the most destructive cyber attacks of recent times.

Dubbed GreyEnergy by researchers at ESET, the group is believed to have been active over the last three years and to be linked to BlackEnergy, the attack group whose actions left 230,000 people in Ukraine without electricity in December 2015.

According to analysis by ESET, GreyEnergy is also related to Telebots - the group behind NotPetya, an destructive attack which a number of Western government security agencies have attributed to Russia's military intelligence service, the GRU.