Did you follow the steps outlined at the guide above?
The easiest way would be for you to first restore your latest backup from before the hack then overwrite your forum files with the ones from the 4.1.12 pl2 package and then run the upgrader. This will take care of 2 things at once, one it will clean all your forum files and upgrade your forum as well. Keeping up to date with the latest versions is the best way security wise.
Then do a thorough checkup of your server space for any suspicious file/s that shouldn''t be there.
And as last but not least contact your host to check their logs and see how your forum was hacked. You say that you are sure that the vb was the culprit and not the host. May I ask you how come you have reached that conclusion?
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