Do you use app for MacOS of for Windows?
i use window 7. have a member got the same problem with me.
so everybody take care your coin.

Anybody can be a victim of this type of attack, you should try to lock your wallet by making use of a very strong password and write the password somewhere you can easily access but separate from your wallet computer.
Try to remove ethd wallet from the %appdata% and keep it offline.
sorry about your loss.