Federal Bureau of Investigation and the US Department of Homeland Security implicated Russian hacking group Fancy Bear in attacks against several election-related targets. Hackers used a combination of techniques ranging from spear phishing, spoofed domains and malware to harvest credentials in order to gain access to accounts controlled by a political party. The FBI-DHS implicates Russian intelligence services who allegedly initiated the attacks via Fancy Bear, also known as APT28 and Sofacy. In June, Crowdstrike implicated Cozy Bear in hacks against the Democratic National Committee.
Source: https://threatpost.com/fbi-dhs-report-links-fancy-bear-to-election-hacks/122802/