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Hey guys, I am surprised to have gone to my site to find it was all okay except for my forum tab. When I go to it, a SA Team H4XOR thing comes up. The same image comes up when, or if i try to access the Admin CP which is a big problem. Basically my Forums got hacked/taken over. Question is, how can I fix this?

Site name:
http://csrpromodding.com/portal.php (Home page which is okay)
http://csrpromodding.com/index.php (Forum page which is hacked)

Thanks to anyone who can help!

Just replace the index.php file via FTP, then secure more your board.

Just replacing the index.php file might get you back your forum but unless you fix the hole that the hacker used to deface your forum you are just waiting for it to happen again.

I would read this blog post on some pointers on what you should do

http://mattrogowski.co.uk/?p=314

They are just possibly noob hackers, nothing more.

Just copy the Index template from your original theme that you're using now and paste it in Themes & Styles > Templates > YOUR CURRENT THEME TEMPLATE > Index Page Templates > Index,

They just defaced you index page, nothing else, rest part is okay, see:

http://csrpromodding.com/showteam.php

Remember to change all your website passwords (FTP, MySQL Database etc) so if the hacker knew your password, they cannot deface your website again.

I am a hacker aswell.
Do you allow me to hack it back if it is possible?