For some reason,
my index.php in my root folder seems to keep getting compromised. I found last week that within the file there had been a link in there to a viagra file in the main directory. I fixed this, changed passwords, etc. and upgraded WP, but it has happened again! The following was in my index.php file
the file in question was littered with viagra text.
I have no spyware or anything like this on my machine, and the passwords are changed regularly. Only one other person has access to FTP, but surely it's not him and it shows ME as the owner of both of these files in terms of modifying etc.
I have looked at the index.php file and it says modified 29/01/2010 and the viagra file in question was uploaded today.
I don't know what to do. I've done anything I know in terms of security, passwords, etc. but it keeps happening, and it has also destroyed my search engine credibility.