Any time we look at clandestine operations like hacking and intelligence, it is hard to sort out fact from fiction.
It was IMO most likely hackers working either directly for Russia or with their turning a blind eye. En Marche are a new political organisation, having weak security wouldn't be suprising. Also being a new organisation, I seriously doubt their capability of pulling off such a Machiavellian self leak for what benefit?
It could be the US trying to discredit Russia, but it seems unlikely to have happened without it having been ordered by the very top of the US command structure, like Trump himself. Having probably benefited from Russian interference, and more importantly, having been accused of benefiting from Russian hacking, I don't see him doing that. If Trump moved against Russia, he would want it public so he would be able to brag about it to build up deniability for the investigation into Russian influence in the US election.
The DNC leaks may have come from a disgruntled Democrats employee, I don't know. I gave Wikileaks the benefit of the doubt on that one.
Is the Macron 'leak' a legitimate leak?
There Are No “Macron Leaks” in France. Politically Motivated Hacking Is Not Whistleblowing.
I think you can get the gist from the headline.
I don't think Wikileaks jumping on the leaks was a good look, it adds weight to the theory that they are becoming an agent for Russia / the far right. I am not convinced either way yet (I don't ever feel a need to commit to a position when things are so murky), I still follow the account, I just don't give it the same benefit of the doubt that I used to. I am more wary these days.