An infamous Iranian hacker group may be targeting industrial control systems to cause major disruptions in power grids, oil refineries, and other physical energy assets, in an apparent sharpened focus on cyber warfare on critical industries. These attempts by Iranian hackers to infiltrate systems controlling energy assets come at a time of heightened tension between the United States and Iran and at a time of increased cyber threats to the energy industry in the United States and globally. Iranian hacker group APT33—also known as Elfin, Refined…