Published Dec 15, 2009 | Updated Sep 15, 2017


Severe |Detected with Windows Defender Antivirus

Aliases: Win32.HLLW.Facebook.331 (Dr.Web) Win32/Koobface.NBH (ESET) Virus.Win32.Hiloti (Ikarus) Net-Worm.Win32.Koobface.cjz (Kaspersky) W32.Koobface!gen (Symantec) WORM_KOOBFACE.KH (Trend Micro) Worm.Koobface.BXP (VirusBuster)


Microsoft security software detects and removes this worm.
Worm:Win32/Koobface is a worm that spreads by posting messages, containing a link to the worm, to the pages of other contacts on social network sites such as
The worm can download and run other malware that could include updates of the worm.
The worm can also display pop-up messages or windows that attempt to lure users to install rogue security software.

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.

Disable Autorun

This threat tries to use the Windows Autorun function to spread via removable drives, like USB flash drives. You can disable Autorun to prevent worms from spreading:

Scan removable drives

Remember to scan any removable or portable drives. If you have Microsoft security software, see this topic on our software help page:

Use cloud protection

The Microsoft Active Protection Service (MAPS) uses cloud protection to help guard against the latest malware threats. It’s turned on by default for Microsoft Security Essentials and Windows Defender for Windows 10. 

Get more help

You can also see our advanced troubleshooting page for more help.

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

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