same here!
0.79615079 BTC STOLEN!
by ADRESS:
13k7TnLmzvcvLncRyQm7uwVtLc6tLRApP2
is there anything I can do?
In a word, No.
BTC transactions are irreversible. If you did not create and/or authorise this transaction, then you coins have most likely been stolen by someone who managed to get your private keys, your wallet seed or your wallet file+password. If someone took your coins without permission, they're not likely to give them back.
Did you recently attempt to claim Bitcoin Gold or Bitcoin Cash via a website or download some new wallet software that you put your private keys or seed into? There are a lot of scams going on at the moment with the various forks happening.
Did you store your seed and/or private keys on an online storage service like dropbox? did you store them digitally in a text file on your computer?
I would suggest that you scan your computer for viruses/malware at the very least... but a complete format and Operating System reinstall is probably the safer option. You should also consider your current Electrum wallet totally compromised and stop using it immediately and generate a new wallet with a new seed.