NSA Director Michael Rogers says the DNC hack was deliberate action by a state actor with specific motives. He stopped short of attributing the attack on any particular nation state. The leaks were politically motivated with a view to damaging the Clinton campaign in the crucial last few months leading to the presidential election. Some security vendors have pinned the attack to Cozy Bear and Fancy Bear, two Russian advanced persistent threat groups that are believed to be working for the Russian government. The leaked emails provided details on major donors of Hillary Clinton’s campaign while many others proved highly embarrassing to the party.”]
Source: https://www.darkreading.com/attacks-breaches/nsa-chief-says-dnc-email-leak-was-deliberate-act