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Microsoft Security Intelligence
Published Jan 11, 2005 | Updated Aug 15, 2011


Detected by Microsoft Defender Antivirus

Aliases: W32/Netsky (McAfee) W32.Netsky (Symantec) WORM_NETSKY (Trend Micro)


The Netsky family is a mass-mailing worm that targets computers running certain versions of Microsoft Windows. The worm sends itself to e-mail addresses that it finds on the infected computer. When a user opens an e-mail attachment that contains a Netsky variant, the worm is activated. Some variants copy the worm to network-share folders. Some variants contain a backdoor component and perform denial of service (DoS) attacks.

To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:

For more information on antivirus software, see

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