Lost any altcoin by hacker is very painful to anyone. If anyone saves  private key is destop, laptop or mobile, it can be posibility lost your altcoin. You should careful when you download any kind of altcoin wallet, because many wallets are harmful to us. Now you can't do anything, because everything was happen. If you have any balance in your desktop, you should move your balance to other Ethereum wallet and also move your private key from desktop.