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Microsoft Security Intelligence
Published Sep 07, 2007 | Updated Aug 22, 2017


Detected by Microsoft Defender Antivirus

Aliases: Win32/Pecoan (CA) W32/Nuwar@MM (McAfee) Storm Worm (other)


Win32/Nuwar refers to a family of Trojan droppers that install a distributed peer-to-peer (P2P) downloader Trojan. This downloader Trojan in turn downloads a copy of the email worm component of Win32/Nuwar.
To detect and remove this threat and other malicious software that may be installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following:
For more information on antivirus software, see
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