You may actually be able to.
As long as you do not use proxies for playing WoW then you have a chance.
Since it was banned you most likely rented it to chinese people which means they have those funky IP's. And if that ip randomly started showing up on your account blizzard will see this.
Just tell them you got hacked and had no control over the account while it was doing the said Exploitation.
There a few posts on how to write a good letter to them i suggest using them!
Hope this helps a little bit.