Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.

VBS.Nugi

VBS.Nugi

Discovered:
01 September 2003
Updated:
13 February 2007
Systems Affected:
Windows

VBS.Nugi is a simple script that attempts to create copies of itself in the KaAaA and Morpheus shared folders. Nakedgirl.jpg.vbs is the filename used.

This threat may also spread as a batch file that creates the malicious VBS script. The batchfile will overwrite C:\Autoexec.bat with its own malicious code.

This threat does not perform additional actions on the system.

Antivirus Protection Dates

  • Initial Rapid Release version 02 September 2003
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 02 September 2003
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date 03 September 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When VBS.Nugi is executed, it performs the following actions:
  1. Attempts to overwrite the C:\autoexec.bat file with a copy of itself.

  2. Copies itself to the KaZaA and Morpheus shared folders as the file, Nakegirl.jpg.vbs.

  3. Changes the registered owner setting to "DumbASS" in the Windows registry.

  4. Checks the system date. If it is the seventh, the worm will display the Windows message:

    You girls like to be naked

NOTE: This threat may be received as a batchfile. In this case, the batchfile will create the VBS file, which will then perform the aforementioned actions. Both the VBS and BAT files are detected as VBS.Nugi.


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
  1. Disable System Restore (Windows Me/XP).
  2. Update the virus definitions.
  3. Run a full system scan and delete all the files detected as VBS.Nugi.

For specific details on each of these steps, read the following instructions.

1. Disabling System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/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 your Windows documentation, or one of the following articles:

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. Scanning for and deleting the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with VBS.Nugi, click Delete.


Writeup By: Neal Hindocha