VBS.Lava

SUMMARY

VBS.Lava is a script that is written in Visual Basic. It attempts to delete antivirus program files.

Protection

• Virus Definitions (LiveUpdate™ Weekly) November 20, 2002
• Virus Definitions (Intelligent Updater) November 14, 2002

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Low
• Payload: Deletes antivirus program files and makes numerous copies of itself on the system
• Deletes Files: Deletes antivurus program files
• Modifies Files: Modifies the Autoexec.bat file

Distribution

• Distribution Level: Low

TECHNICAL DETAILS

VBS.Lava must be downloaded and run to perform its actions. It has no wormlike attributes.

When it runs, it first copies itself to C:WindowsSooolazo.vbs and C:WinNTSooolazo.vbs. These paths are hard-coded and are not determined by system configuration.

If any of the following folders is present on the system, the script attempts to delete all files in the folder:

• C:AntiViral Toolkit Pro
• C:Program FilesCommand SoftwareF-PROT95
• C:Program FilesMcAfeeVirusScan
• C:Program FilesNorton AntiVirus
• C:ToolkitFindVirus
• C:Program FilesPanda SoftwarePanda Antivirus Titanium

Next, the script copies itself as the following files:

• C:Program FilesMorpheusMy Shared FolderCristinaAguilera.Jpg.vbs
• C:Program FilesMorpheusMy Shared FolderAVP-Spanish Patch.Zip.VBS
• C:Program FilesMorpheusMy Shared FolderNorton Antivirus 2002 Crack.Zip.vbs
• C:Program FilesMorpheusMy Shared FolderSilviaSaintDoubleAnalAction.jpg.vbs
• C:Program FilesMorpheusMy Shared FolderPanda Titanium Crack.zip.vbs
• C:Program FilesMorpheusMy Shared FolderLasKetChupXXX.jpg.vbs
• C:Archiv~1MorpheusMy Shared FolderCristinaAguilera.Jpg.vbs
• C:Archiv~1MorpheusMy Shared FolderAVP-Spanish Patch.Zip.VBS
• C:Archiv~1MorpheusMy Shared FolderNorton Antivirus 2002 Crack.Zip.vbs
• C:Archiv~1MorpheusMy Shared FolderSilviaSaintDoubleAnalAction.jpg.vbs
• C:Archiv~1MorpheusMy Shared FolderPanda Titanium Crack.zip.vbs
• C:Archiv~1MorpheusMy Shared FolderLasKetChupXXX.jpg.vbs
• C:Program FilesKaZaAMy Shared FolderCristinaAguilera.Jpg.vbs
• C:Program FilesKaZaAMy Shared FolderAVP-Spanish Patch.Zip.VBS
• C:Program FilesKaZaAMy Shared FolderNorton Antivirus 2002 Crack.Zip.vbs
• C:Program FilesKaZaAMy Shared FolderSilviaSaintDoubleAnalAction.jpg.vbs
• C:Program FilesKaZaAMy Shared FolderPanda Titanium Crack.zip.vbs
• C:Program FilesKaZaAMy Shared FolderLasKetChupXXX.jpg.vbs
• C:Archiv~1KaZaAMy Shared FolderCristinaAguilera.Jpg.vbs
• C:Archiv~1KaZaAMy Shared FolderAVP-Spanish Patch.Zip.VBS
• C:Archiv~1KaZaAMy Shared FolderNorton Antivirus 2002 Crack.Zip.vbs
• C:Archiv~1KaZaAMy Shared FolderSilviaSaintDoubleAnalAction.jpg.vbs
• C:Archiv~1KaZaAMy Shared FolderPanda Titanium Crack.zip.vbs
• C:Archiv~1KaZaAMy Shared FolderLasKetChupXXX.jpg.vbs

Finally, it adds the values

LARVA C:Windowssooolazo.vbs
x C:WinNTsooolazo.vbs

to the registry key

HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun  

so that the script runs when you start Windows.

The script adds the following lines to Autoexec.bat:

@Start C:windowssooolazo.vbs>nul
@Start C:winntsooolazo.vbs>nul
cls

After the script runs, it displays a message box with the title "LVG" and the text

Error 421 Kernel32.dll

REMOVAL

NOTES:

• These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
• If your antivirus product has been deleted, reinstall it before you continue.

1. Update the virus definitions.
2. Run a full system scan, and delete all files that are detected as VBS.Lava.
3. Delete the values
   
   LARVA C:Windowssooolazo.vbs
   x C:WinNTsooolazo.vbs
   
   from the registry key
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   
4. (Windows 95/98/Me only) Remove the text that the script added to the Autoexec.bat file.
   

For details on how to do this, read the following instructions.

To update the virus definitions:
All virus definitions receive full quality assurance testing by Symantec Security Response before being posted to our servers. There are two ways to obtain the most recent virus definitions:

• Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions are posted to the LiveUpdate servers once each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
• Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.
  
  Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.

To scan for and delete the infected files:

1. Start your Symantec antivirus program, and make sure that it is configured to scan all files.
   • Norton AntiVirus consumer products: Read the document How to configure Norton AntiVirus to scan all files.
   • Symantec enterprise antivirus products: Read the document How to verify a Symantec Corporate antivirus product is set to scan All Files.
2. Run a full system scan.
3. If any files are detected as infected with VBS.Lava, click Delete.

To delete the value from the registry:

CAUTION: Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify only the keys that are specified. Read the document How to make a backup of the Windows registry for instructions.

1. Click Start, and click Run. The Run dialog box appears.
2. Type regedit and then click OK. The Registry Editor opens.
3. Navigate to the key
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun
   
4. In the right pane, delete the value
   
   value
   
5. Exit the Registry Editor.

To remove the text that the script added to the Autoexec.bat file:
This needs to be done only if you are running Windows 95/98/Me.

NOTE: (For Windows Me users only) Due to the file-protection process in Windows Me, a backup copy of the file that you are about to edit exists in the C:WindowsRecent folder. Symantec recommends that you delete this file before you continue with the steps in this section. To do this using Windows Explorer, go to C:WindowsRecent, and in the right pane select the Win.ini file and delete it. It will be regenerated as a copy of the file that you are about to edit when you save your changes to that file.

1. Click Start, and click Run.
2. Type the following, and then click OK.
   
   edit c:autoexec.bat
   
   The MS-DOS Editor opens.
   
3. Look for and delete these lines if you find them:
   
   @Start C:windowssooolazo.vbs>nul
   Start C:winntsooolazo.vbs>nul
   cls
   
4. Click File, and click Save.
5. Click File, and click Exit.