W32.Welchia.Worm

Overview

W32.Welchia.Worm is a worm that take advantage of security vulnerabilies in the Windows operating system. It is also known as WORM_NACHI.A and W32/Nachi.worm.

Classification

Worm

Files

Dllhost.exe, Tftpd.exe

If you have any of the files related to W32.Welchia.Worm on your system, please send them for additional analysis. Generally, I have only analysed a few versions for each software component listed at this web site. With your help I will be able to look at both old and more recent versions of the W32.Welchia.Worm software. Thank you very much for your time!

Log references

Bazooka Log 103 Hijackthis log 1 Hijackthis log 2

Detection

Bazooka Adware and Spyware Scanner detects W32.Welchia.Worm. Bazooka is freeware and detects spyware, adware, foistware, trojan horses, viruses, worms and other potentially unwanted applications. Read more »

Uninstall procedure

Please go to the anti-virus recommendation page. You can find both free products or use one of the trials to remove the virus.

Manual removal

Please follow the instructions below if you would like to remove W32.Welchia.Worm manually. Please notice that you must follow the instructions very carefully and delete everything that is mentioned. In most cases the removal will fail if one single item is not deleted. If W32.Welchia.Worm remains on your system after stepping through the removal instructions, please double-check by stepping through them again.

1. Start your computer in safe mode.
2. Start the registry editor. This is done by clicking Start then Run. (The Run dialog will appear.) Type regedit and click OK. (The registry editor will open.)
3. Delete:
   'HKEY_LOCAL_MACHINE\SYSTEM \ CurrentControlSet \ Services \ RpcTftpd'
4. Delete:
   'HKEY_LOCAL_MACHINE\SYSTEM \ CurrentControlSet \ Services \ RpcPatch'
5. Exit the registry editor.
6. Restart your computer.
7. Start Windows Explorer and delete:
   %SystemDir%\wins\Dllhost.exe
   Note: %SystemDir% is a variable (?). By default, this is C:\Windows\System (Windows 95/98/Me), C:\WINNT\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

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Contact information for W32.Welchia.Worm's vendor

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