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Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Nachi.C
Technical name:W32/Nachi.C.worm
Threat level:Low
Effects:  It exploits the RPC DCOM, WebDAV and Workstation Service vulnerabilities in order to spread. It uninstalls the worms Mydoom.A and Mydoom.B, and deletes the files carrying these worms.

Affected platforms:

Windows 2003/XP/2000

Detection updated on:Feb. 13, 2004
Proactive protection:
Yes, using TruPrevent Technologies
Repair utility:Panda QuickRemover

Brief Description 


Nachi.C is a new variant of the worm Nachi.B.

Nachi.C a worm that affects Windows 2003/XP/2000/NT computers only. Nachi.C exploits the vulnerabilities Buffer Overrun in RPC Interface, WebDAV and Workstation Service Buffer Overrun in order to spread to as many computers as possible.

Nachi.C spreads by attacking remote computers and exploits the vulnerabilities mentioned above to download a copy of itself to the compromised computer. In order to do this, Nachi.C incorporates its own web server.

Nachi.C uninstalls the worms Mydoom.A and Mydoom.B, by ending their processes and deleting the files carrying the worms.

If you have a Windows 2003/XP/2000/NT computer, it is highly recommendable to download the security patches from the Microsoft website for the following vulnerabilities: Buffer Overrun in RPC Interface, WebDAV and Workstation Service Buffer Overrun.

Visible Symptoms 


Nachi.C is difficult to recognize, as it does not show any messages or warnings that indicate it has reached the computer.