security expert required linus centOS

I am Looking for security expert I have gotten hacked recently and need you to analyze how the attact took place. In other words point of entry and to then repair the security hole. I found the rootkit and deleted almost immediately, so no damage was done, however I ca'nt find how they got in. they did deface 3 websites as well, I have kept all logs, the attack took place last evening If you can repair and find the issue I will be open to other work hardening the system after. Only reply if your a linux expert, that is 100% experienced in security issues... please