Threat Explorer

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VBS.Satanik.B

VBS.Satanik.B

Discovered:
09 April 2002
Updated:
13 February 2007


VBS.Satanik.B is written in VBScript in HTML. It modifies the Autoexec.bat file to delete all files in the \Windows\%System% and \%Windows% folders. Norton AntiVirus detects the modified Autoexec.bat file as Trojan Horse.

NOTES:
  • %Windows% is a variable. By default this is C:\Windows or C:\Winnt.
  • %Windows\System% is a variable. By default this is C:\Windows\System or C:\Winnt\System32.


Antivirus Protection Dates

  • Initial Rapid Release version 09 April 2002
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 09 April 2002
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date 10 April 2002
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Delete all files that are detected as VBS.Satanik.B or Trojan Horse. On Windows 95/98/Me-based computers, remove the text in the Autoexec.bat file that refers to deletion of files.

To delete the Trojan:
  1. Obtain the most recent virus definitions. There are two ways to do this:
    • Run LiveUpdate. LiveUpdate is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time 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 have undergone full quality assurance testing by Symantec Security Response. They 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.
  2. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files. For instructions on how to do this, read the document How to configure Norton AntiVirus to scan all files.
  3. Run a full system scan.
  4. Delete all files that are detected as VBS.Satanik.B or Trojan Horse.

To edit the Autoexec.bat file:
This is necessary only on Windows 95/98/Me-based computers.

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:\Windows\Recent folder. We recommend that you delete this file before you continue with the steps in this section. To do this using Windows Explorer, go to C:\Windows\Recent, and in the right pane select and delete the Win.ini file. 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 a line that refers to deleting the contents of the \Windows and \Windows\System folders. For example, the text del C:\Windows
  4. Delete any such references.
  5. Click File, and click Save.
  6. Click File, and click Exit.


Writeup By: Kaoru Hayashi