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


Detected by Microsoft Defender Antivirus

Aliases: Win32.Maslan (CA) Maslan (F-secure) Net-Worm.Win32.Maslan (Kaspersky) W32/Maslan (McAfee) W32/Maslan (Sophos) W32.Maslan (Symantec) WORM_MASLAN (Trend Micro)


Windows Defender Antivirus detects and removes this threat.
Win32/Maslan is a family of mass-mailing network worms that targets computers running Microsoft Windows. The worm spreads through email and peer-to-peer file-sharing applications. It can also spread to computers that have not been patched for the Windows vulnerabilities described in Microsoft Security Bulletins MS03-039 and MS04-011. The worm installs two backdoors, one of which is a variant of Win32/Sdbot. The worm has a stealth component that hides certain files and directories.

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