The problem may be from:
1. Your HitBTC account directly
2. 3rd party app you used to trade
3. HitBTC API, if you are not using the updated version (v 2.0)
I'm afraid you could get back your assets, but start on checking all the histories on HitBTC directly not on tabtrader app.
My funds is not actually stolen.
My XRP is sell at BTC, Then after that BTC to BOX then BOX to EOS.
Then he/she sells my fund at low then buy at HIGH. Until my coins is gone.
Do you got me?
Change your password and enable 2fa as soon as possible. You may be able to save some of whatever funds are left if you hurry up and get the guy locked out of your account. More than likely, it was somewhere else that got hacked and he got your password from that database leak. I really don't think you can blame HitBTC for this one.