Manual Removal
As an alternative to using the removal tool, you can manually remove this threat.
The following instructions pertain to all current and recent Symantec antivirus
products, including the Symantec AntiVirus and Norton AntiVirus product lines.
Disable System Restore (Windows XP).
Update the virus definitions.
Restart the computer or end the Worm process.
Run a full system scan and delete all the files detected as W32.Welchia.Worm.
Delete the values from the registry.
Delete the Svchost.exe file.
For details on each of these steps, read the following instructions.
1. Disabling System Restore (Windows XP)
If you are running Windows XP, we recommend that you temporarily turn off System
Restore. Windows XP uses this feature, which is enabled by default, to restore
the files on your computer in case they become damaged. If a virus, worm, or
Trojan infects a computer, System Restore may back up the virus, worm, or Trojan
on the computer.
Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.
Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.
For instructions on how to turn off System Restore, read "How to turn
off or turn on Windows XP System Restore."
For additional information, and an alternative to disabling Windows Me System
Restore, see the Microsoft Knowledge Base article, "Antivirus Tools Cannot
Clean Infected Files in the _Restore Folder," Article ID: Q263455.
2. Updating the virus definitions
Symantec Security Response fully tests all the virus definitions for quality
assurance before they are posted to our servers. There are two ways to obtain
the most recent virus definitions:
Running LiveUpdate, which is the easiest way to obtain virus definitions: These
virus definitions are posted to the LiveUpdate servers once each week (usually
on Wednesdays), unless there is a major virus outbreak. To determine whether
definitions for this threat are available by LiveUpdate, refer to the Virus
Definitions (LiveUpdate).
Downloading the definitions using the Intelligent Updater: The Intelligent Updater
virus definitions are posted on U.S. business days (Monday through Friday).
You should download the definitions from the Symantec Security Response Web
site and manually install them. To determine whether definitions for this threat
are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent
Updater).
The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.
3. Restarting the computer in Safe mode or ending the Trojan process
Windows 95/98/Me
Restart the computer in Safe mode. All the Windows 32-bit operating systems,
except for Windows NT, can be restarted in Safe mode. For instructions, read
the document, "How to start the computer in Safe Mode."
Windows NT/2000/XP
To end the Trojan process:
Press Ctrl+Alt+Delete once.
Click Task Manager.
Click the Processes tab.
Double-click the Image Name column header to alphabetically sort the processes.
Scroll through the list and look for Dllhost.exe.
If you find the file, click it, and then click End Process.
Exit the Task Manager.
4. Scanning for and deleting the infected files
Start your Symantec antivirus program and make sure that it is configured to
scan all the files.
For Norton AntiVirus consumer products: Read the document, "How to configure
Norton AntiVirus to scan all files."
For Symantec AntiVirus Enterprise products: Read the document, "How to
verify that a Symantec Corporate antivirus product is set to scan all files."
Run a full system scan.
If any files are detected as infected with W32.Welchia.Worm, click Delete.
5. Deleting the values from the registry
CAUTION: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry," for instructions.
Click Start, and then click Run. (The Run dialog box appears.)
Type regedit
Then click OK. (The Registry Editor opens.)
Navigate to the key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
Delete the subkeys:
RpcPatch
and:
RpcTftpd
Exit the Registry Editor.
6. Deleting the Svchost.exe file
Navigate to the %System%\Wins folder and delete the Svchost.exe file.