cannot remove hacker's file
 

A hacker has modified some system files in /etc. I could not find the way to remove (or modify) this file.

I have tried rm -f <filename> with supervisor priviledge (login as root) and got back the msg : "operation not permitted".

Pls. kindly advise

hey,

i answered this or gave some input in the security forum, much appreciate if you don't double post the same question in two different forums.