The recent attack against the Polish power grid has been attributed to ELECTRUM, a Russian state-sponsored cyber group. That hack sought to disable communications and control units in Industrial Control Systems of heat and power systems.

Aggressive Nation State actors, such as Russia, are sharpening their cyber-attack skills and targeting global adversaries. 

https://www.bulbapp.io/p/d189bde0-3430-4451-b58e-fba9d5e56a2e/russia-ramps-up-attacks-on-critical-infrastructures