You are sure your coins are stolen?
If I read the FAQ, at one point it says:
Your URL is Your Key
Bookmark your wallet’s secret URL to access your RushWallet in the future. Please note, this is your private URL so do not share it with anyone. If you lose this URL your bitcoins will be lost forever.
So, if you access
https://rushwallet.com you create a new wallet again, with no coins inside.
You need to access the wallet with a special URL.
You should look into the history of your browser to find the URL. I hope you did not clean it.
By the way, first time I hear of rushwallet.
It really makes using bitcoin very very easy.
I don't know if they are trustworthy and if the source code is readable to see if there are no backdoors.
I use something similar with mymonero.com to store some monero's