Virus Profile: VBS/Soraci

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 5/9/2003
Date Added: 2/25/2004
Origin: Unknown
Length: Varies
Type: Virus
Subtype: VbScript
DAT Required: 4264
Removal Instructions
   
 
 
   

Description

This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.

Indication of Infection

  • Presence of the files and registry entries detailed above
  • Increase in the size of HTT, HTM and HTML files

Methods of Infection

Running an infected file will cause the virus to append itself to all HTT, HTM and HTML files.

Aliases

VBS.Manual (AVP), VBS.Soraci (NAV), VBS/Manual (F-Prot)
   

Virus Characteristics

This is a file infecting VBScript virus that infects files with extension HTT, HTM, and HTML. When run, the virus will create or modify the following registry keys to change the Internet Explorer start page:

  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Default_Page_URL" = http://www.(address neutered) .com/hedda_marie_tolentino/index.htm
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Local Page" = http://www.(address neutered) .com/hedda_marie_tolentino/index.htm
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main "Start Page" = http://www.(address neutered) .com/hedda_marie_tolentino/index.htm
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main "Default_Page_URL" = http://www.(address neutered) .com/hedda_marie_tolentino/index.htm
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main "Local Page" = http://www.(address neutered) .com/hedda_marie_tolentino/index.htm
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main "Start Page" = http://www.(address neutered) .com/hedda_marie_tolentino/index.htm

The virus creates the following files:

  •  %SysDir%\icarOs.dll (2,824 bytes)
  •  %SysDir%\icarOs2.dll (3,748 bytes)
  •  %SysDir%\scanregw.vbe (3,718 bytes)

(Where %SysDir% is the Windows System directory on the system, for example c:\WINDOWS\SYSTEM.)

A registry entry is also created to run the virus on Windows startup:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
    CurrentVersion\Run "ScanRegistry " = %SysDir%\scanregw.vbe

This virus has a malicious payload to restart Windows continuously if the date is September 26.

   

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

But in some particular cases, the following steps need to be taken.

Please go to the Microsoft Recovery Console and restore a clean MBR.

On Windows XP:

  • Insert the Windows XP CD into the CD-ROM drive and restart the computer.
  • When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
  • Select the Windows installation that is compromised and provide the administrator password.
  • Issue 'fixmbr' command to restore the Master Boot Record
  • Follow onscreen instructions.
  • Reset and remove the CD from CD-ROM drive.


On Windows Vista and 7:

  • Insert the Windows CD into the CD-ROM drive and restart the computer.
  • Click on "Repair Your Computer".
  • When the System Recovery Options dialog comes up, choose the Command Prompt.
  • Issue 'bootrec /fixmbr' command to restore the Master Boot Record.
  • Follow onscreen instructions.
  • Reset and remove the CD from CD-ROM drive.
   

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