Skip to main content
Microsoft Security Intelligence
Published May 11, 2005 | Updated Sep 15, 2017


Detected by Microsoft Defender Antivirus

Aliases: W32/Opaserv.worm (McAfee) WORM_OPASERV.GEN (Trend Micro) W32.Opaserv.Worm (Symantec) Win32.Opaserv (CA) Opaserv (F-secure)


Windows Defender Antivirus detects and removes this threat.
Win32/Opaserv is a family of network worms that targets computers running certain versions of Microsoft Windows.
The worm spreads through network shares using weak passwords or by exploiting the Windows vulnerability described in Microsoft Security Bulletin MS00-072. The worm can connect to a specified Web site to update itself. A Trojan dropped by one or more Opaserv variants performs operations that can prevent a computer from restarting.

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find hidden malware.

Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.

Follow us