Needs big help
 

I'm hoping that someone can help with this problem I'm having.

Basically my forum got hacked today.

Symptom(s):
- any new threads/posts seemed to have displayed the hacker's advertising message
- if any post was made in older threads have also infected other posts in the same thread in multiple pages. Mostly all posts in an infected thread got the same message.
+ these messages displayed don't seem to be searchable.. good thing is that the content of each post can be edited back to original post. I believe I have thousands of posts infected with this hack and i can't go ahead and edit/save each post manually. (if i click on edit button on an infected post I can see original content so I can save it to get the original post back..)

I'm in need of help to make this process automated somehow..

Please help.