U.S. firm blames Russian 'Sandworm' hackers for Ukraine outage

U.S. cyber intelligence firm iSight Partners said on Thursday it has determined that a Russian hacking group known as Sandworm caused last month's unprecedented power outage in Ukraine. "We believe that Sandworm was responsible," iSight's director of espionage analysis, John Hultquist, said in an interview. The Dec. 23 outage at Western Ukraine's Prykarpattyaoblenergo cut power to 80,000 customers for about six hours, according to a report from a U.S. energy industry security group.