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Published Mar 06, 2009 | Updated Sep 15, 2017


Detected by Microsoft Defender Antivirus

Aliases: Win32/Conficker.worm.88064 (AhnLab) Win32.Worm.Downadup.Gen (BitDefender) Win32/Conficker.C (CA) Win32/Conficker.X (ESET) Trojan.Win32.Pakes.ngs (Kaspersky) W32/Conficker.worm.gen.c (McAfee) W32/Conficker.D.worm (Panda) W32/Confick-G (Sophos) W32.Downadup.C (Symantec)


Windows Defender detects and removes this threat.

This worm can stop some security products from working properly, such as your antivirus software.

It spreads using peer-to-peer (P2P) connections to infect any PC on your network. It can also infect removable drives (such as USB flash drives), and exploit weak passwords.

The following free Microsoft software detects and removes this threat:

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

Important recovery steps

Microsoft Help and Support has a detailed guide to removing a Conficker infection from an affected computer, either manually or by using the Malicious Software Removal Tool (MSRT).

For detailed instructions on how to manually remove Conficker, view the following article using an uninfected PC:

If your computer is infected by Conficker, it might not be unable to connect to websites related to security applications and services that can help remove it (for example, downloading antivirus updates may fail). In this case you will need to use an uninfected computer to download any appropriate updates or tools and then transfer these to the infected computer. You should also:

More information about deploying MSRT in an enterprise environment can be found in the following article:

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.




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