Published Feb 11, 2009 | Updated Sep 15, 2017

Worm:Win32/Conficker.B!inf

Severe |Detected with Windows Defender Antivirus

Aliases: No associated aliases

Summary

Microsoft security software detects and removes this worm.
 
Worm:Win32/Conficker.B!inf is the detection used for the autorun.inf files created by Conficker.B when it attempts to spread through mapped and removable drives.
For more information, please see Worm:Win32/Conficker.B.

Worm:Win32/Conficker.B is a worm that infects other computers across a network by exploiting a vulnerability in the Windows Server service (SVCHOST.EXE). 

If the vulnerability is successfully exploited, it could allow remote code execution when file sharing is enabled. It may also spread through removable drives and weak administrator passwords. It disables several important system services and security products.

Microsoft strongly recommends that users apply the update referred to in  Security Bulletin MS08-067 immediately.

Microsoft also recommends that users ensure that their network passwords are strong to prevent this worm from spreading via weak administrator passwords. More information is available here.

Microsoft also recommends that users apply an update that changes the AutoPlay functionality in Windows to prevent this worm from spreading via USB drives. More information is available in the Microsoft Knowledgebase Article KB971029 .

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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