My Addon sites hacked

Hi,
My sites displayed a message while loading it as haked by some Hasturk or something…Now i am being displayed nothing jus
“Index of /

.ftpquota
Apache Server at ***.com Port 80″

when i checked in suscuri.net..it showd a warning
“Security warning in the URL:
http://&***.com/404testpage4525d2fdc
and Security warning in the URL:
http://***.com/404javascript.js “
When i checked the ftp all my files are being deleted except ftp quota file.
Can anyone please help me how should i proceed i am having only the wordpress export file(all).