After 4 days of running bitcoinwalletcracker (over 100 instances), I found 1 address with bitcoins but I don't know what to do with it and whether it's legal. However it's fun

I can't believe it's that simple.
More about PM.
If your words are not kind of mocking send those bitcoins from found address to the same address. Then you’ll let know the owner that his wallet is not reliable one and force him to change it. By doing this you would bless yourself. Don't fly in the face of Providence by trying to steal something that doesn’t belong to you.
Would you mine to give us the details of your hardware?