What is it?
Backdoor.Nemog is a Backdoor Trojan horse.

What's it do?
Allows an infected computer to be used as an email relay and HTTP proxy

Creates the service dx32hhec so that it executes every time Windows starts.

Creates the following files:
%System%dx32hhlp.exe
%System%dx32hhec.sys

Removal
@symantec