First of all, blockchain can't "be hacked" like RawDog said, nor can you get the funds back through that "keys.lol" website. I'm not sure what's up with the trolling but anyway..

Blockchain Support can't help you, nor can we... if some automated malware got your funds stolen, they're probably gone for good so you can't really do much about it.

As far as I can understand, it wasn't you who initiated the transaction, right? To me it sounds like some automated script that detects Blockchain Wallet login and sweeps the funds out of it. If it was automated, then it means you most likely had a malware on your PC either through browser plugins or infected downloads..

It's hard to take the loss but man yourself up and move on - it could happen to the best of us.