Details here:
“[Vladimir] Putin publicly pointed to the Panama Papers disclosure and the Olympic doping scandal as US-directed efforts to defame Russia, suggesting he sought to use disclosures to discredit the image of the United States and cast it as hypocritical," the report reads.
http://www.si.com/olympics/2017/01/06/us-intelligence-agency-russia-hackers-dnc-wada-doping-scandal
and here:
http://deadspin.com/intelligence-agencies-russia-hacked-dnc-in-part-becaus-1790911573