They are using asp.net script it is automatically
install and replace the index.htm,index.html,default.html,default.htm, index.php file with therehacking files.
They also hacked
These hacker he is also created bug in the twitter bug.
While your open these site I got the following error message.
best regards to all world.
Solution For the Problem.
You need to restore Old backup content to your FTP account.
Then try it