Copying and pasting from down-thread - a Putin apparatchik was gloating to the Guardian that they helped sway the election the day after the results came in (ctrl+f "wikileaks":
Clapper today said that the government doesn't know how WL got the emails. And earlier statements have said that a "state actor" was suspected for circumstantial reasons (the claim was that government officials in a variety of nations were targeted). So you are correct, there has been zero evidence.