Thanks for the answers. I downloaded the software from this page:
https://electrum.org/#downloadIt is the official version I would say. But they used the REMCOS malware to keylog everything and stole my money like this.
I guess that they didn't just keylog everything, they also copied some of your files (at least the wallet file).
Since they logged all, they have your password too, so they could access your private keys, even if you had the 2FA.
All in all, your money was not stolen
from Electrum. It was stolen .. from you.
Very sad story

You should have really check your computer for viruses
before trying to keep
one Bitcoin on it...