Published Nov 11, 2004 | Updated Sep 19, 2006


Severe |Detected with Windows Defender Antivirus

Aliases: Win32/HLLW.Welchia (Symantec) WORM_NACHI (Trend Micro) W32.Nachi.worm (McAfee) Win32.Nachi (CA)


Win32/Nachi is a family of network worms that spread across network connections by exploiting one or more vulnerabilities in Microsoft Windows 2000 and Windows XP. These worms can also spread using backdoors opened by other malicious software. The worm tries to download and apply security updates; some variants try to remove other malicious software that may be on the infected computer. Some variants replace Web pages stored on the computer with their own Web page.
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