Dloader.EUZ Trojan may be downloaded from remote sites by other malware. It may be dropped by other malware. It may be downloaded unknowingly by a user when visiting malicious Web sites. It may also arrive as an attachment to spammed email messages.

This Trojan drops several files, some of which are detected as TROJ_DLOADER.EUZ.

This Trojan registers itself as a system service to ensure its automatic execution at every system startup. It also creates registry entries to enable its execution even in safe mode.

It accesses a URL to download a malicious file, which trend Micro detects as TROJ_AGENT.BWD.

Technical details can be found at this Trend Micro page.