Site hacked index.php and com_users table modified - Joomla! Forum - community, help and support

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hi,
i joomla developer. few of site developed on both joomla 1.5 , 2.5 platform hacked hackers. modified index.php file , modified com_users table in database. don't know how they(hackers) did it. information sites has following settings:-
1. admin id , password while publish online changed.
2. sef on
3. htaccess file renamed .htaccess

please me out weird problem.
can tell me security steps or tools available joomla check site vulnerability , make secure.

thanks

see:

help! site's been compromised. what?





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