Okay, now I don't get what's frigging wrong with some guys hacking wallets with recently listed cryptos and sending eth and transferring them out??? That's a new low, or is it an old trick?
I hate that too, but perhaps that thief getting your private key from some place, perhaps from a phishing sites.
If that what happen then you should not using that same wallet again in the future, if you keep on using it, then there is chance that your fund will be taken again.