Wednesday, December 06, 2006

How to remove yahoo messenger worm ?

Promblem:

If your yahoo messenger is affected by this worm it will send the nsl-school.org url (and other different urls) to all of your friend list in yahoo messenger using your ID . So with in few hours many of your friends will get infected with it if they click on any of these links.

I don't know the actual target of the idiot who created it. May be to advertise his site or to steal very imp data from your computer. I resolved the problem manually from 2 infected PC's. Just go through the below steps carefully.

What are those links ?

Nsl-school.org and other (Do not open this url in your browser).

After effects ?

1: It sets your default IE page to nsl-school.org, you can’t even change it back to other page. If you open IE from your comp some malicious code will automatically executed into your computer.

2: It will disables the Task manager / reg edit. So you can’t kill the malicious processes anymore.

3: Files that are gonaa installed by this virus are svhost.exe , svhost32.exe , internat.exe, enet.exe.

you can find these files in windows/ & temp/ directories.

4: It may send the secured & protected information to attacker.


Manual Removal:

1: Close the IE browser. Log out messenger / Remove Internet Cable.

2: To enable Regedit

Click Start, Run and type this command exactly as given below: (better - Copy and paste)

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f

3: To enable task manager : (To kill the process we need to enable task manager)

Click Start, Run and type this command exactly as given below: (better - Copy and paste)

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f

4: Now we need to change the default page of IE though regedit.

Start>Run>Regedit

From the below locations in Regedit chage your default home page to google.com or other.

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main

HKEY_ LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main

HKEY_USERS\Default\Software\Microsoft\Internet Explorer\Main

Just replace the attacker site with google.com or set it to blank page.

5: Now we need to kill the process from back end. Press Ctrl + Alt + Del

Kill the process svhost32.exe . ( may be more than one process is running.. check properly)

6: Delete svhost32.exe , svhost.exe files from Windows/ & temp/ directories. Or just search for svhost in your comp.. delete those files.

7: Go to regedit search for svhost and delete all the results you get.

Start menu > Run > Regedit >

8: Restart the computer. That’s it now you are virus free.


Removal Tools:

I did not use these tools. Please make sure that they are appropriate for the purpose.

1. http://hot_kool_mohnish.tripod.com/sitebuildercontent/sitebuilderfiles/svhost32-removal.zip

2. http://www.reloadedlabs.com/ymworm.htm

3. Following steps can be taken to remove worm from your system:

1) Download this file: http://avsharath.googlepages.com/RepairRegistry.reg (repairs your registry which is damaged by the worm)

2) Double click on that downloaded registry file, you will be asked wheather you're sure to add this to registry, click yes.
3) Restart your system.
4) Delete the file svhost32.exe from your Windows folder( If it is present).
5) Delete the file svhost.exe from your Windows folder( If it is present).
6) Lastly, search for: ENET.EXE and delete it if found.