Yesterday, I visited my website as a normal visitor and everything was fine, but today when I tried to do, I got this message: "Access Denied.". So I checked it via FTP and found the index.php file damaged, and it was impossible to download it.
I don't understand this behavior? Does that make sense? is not it possible that someone has stolen my files using hacking techniques.
PS: I change my FTP password every time I finished with.