Security issue- Index.php file permission set to 00

[eluser]skunkbad[/eluser]
[quote author="OJ" date="1273408261"]Guys,
Some hackers shut my site down. They updated my index.php file bu setting the file permission to 00.
Does any one know the quick way to fix this. My host is delaying intheir investigations. I read some other thread but no clear solution.
Does anyone know?[/quote]

From my experience in the past, setting permissions to 000 on a shared host requires them to reset the permissions. You no longer control the file.