I'm going to go out on a limb here and guess that you did not read the Mueller team's indictment of 12 Russian GRU agents for the hacking of the DNC. There is a lot of information in there, and Crowdstrike's suppositions are not the only evidence.
I suggest, if you are interested in "who hacked the DNC" you need to read the Mueller indictment.
Here it is:
“the Mueller team’s indictment of 12 Russian GRU agents”
An indictment for a case that will never see the inside of a courtroom, of course. It’s very easy to make assertions in an indictment when you know you will never have to prove any of those assertions in court. This was purely political grandstanding by Mueller. You don’t publicly file criminal indictments against foreign spies that you haven’t even apprehended; that’s ludicrous on its face.
“There is a lot of information in there...”
“Information” is not the same thing as “evidence”. I could say that I had a dream that Ronald McDonald hacked the DNC. That’s “information”, but it’s not any kind of “evidence”.
“...Crowdstrike’s suppositions are not the only evidence.”
Frankly, we have no idea what the “evidence” for that indictment is, because there is no evidence actually mentioned in the indictment. Knowing Mueller, who filed another indictment against a bunch of Russians that was based entirely on a magazine article, I really am not inclined to give him the benefit of the doubt that he actually has any real evidence to back his assertions.