Trojan:Win32/Helpud is a family of trojans that steals login information for popular online games. The gathered information is then sent to remote websites.
It usually arrives in a system as a DLL file with a random name in the Windows Help folder. It usually registers itself by adding a CLSID in the following registry key, allowing it to automatically load when Windows starts:
Analysis by Andrei Florin Saygo
There are no common symptoms associated with this threat. Alert notifications from installed antivirus software may be the only symptom(s).