The clikjack pornosikisizle was founded only in index.php
Delete the line resolve the problem
But what others source was infected?
How can I do to avoid this kind of attack?
Thanks for any help
How is your server setup? Do you have your code on version control? Did you change all the server passwords? Do you know everyone who has access to your server?
I would also try to keep your Magento updated to the latest version as well.