How to tell the running process--csrss.exe is malicious or not?

From: john (anonymous_at_discussion.microsoft.com)
Date: 04/25/05 

Date: Mon, 25 Apr 2005 18:03:13 +0800

>From the information about csrss.exe on the internet, it could be normal
process or virus.

But how can I find out its true attributes? By some specific software, or
not?

Thank you.