This Trojan may be dropped by other malware. It may be downloaded unknowingly by a user when visiting malicious Web sites.
It creates registry key(s)/entry(ies) as part of its installation routine.
It drops component files. It then executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

It opens a hidden Internet Explorer window to connect to a malicious URL to possibly download and execute a malicious file.

More...