I had my index.php hacked as well, but i also have other things installed on my site like WHMCS and it all works fine. Just nothing related to wordpress. And I had 2.7 it was hacked so my host suggested i upgrade to the latest, and it was 2.8 and then 2 days later i got hacked again. Some egyptian bastards. They are looking at logs and everything. If you do get it fixed, becareful when logging in because if you fail to login the first few times it may be set up to send the input information to the admin email on file which can be easily changed if they change your index.php file. I noticed the hackers email as my admin accounts new email address so password changes got sent to him when i request to have it reset. They didnt want anything, they just want to fuck around with people.
