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.Kelly.A@mm

VBS.Kelly.A@mm

Discovered:
21 March 2001
Updated:
13 February 2007
Also Known As:
Bloodhound.VBS.Worm

This worm sends itself to email addresses in the Microsoft Outlook address book and also spreads to Internet chatrooms using mIRC. This worm overwrites files on local and remote drives, including files with the extensions .js, .jse, .css, .wsh, .hta, and .pwl.

The contents of most of these files are replaced with the source code of the worm, destroying the original contents. The worm also appends the .vbs extension to files with the extensions, .gif, .jpg, and .bmp. For example, image.jpg becomes image.jpg.vbs. It then copies itself to that file name.

Antivirus Protection Dates

  • Initial Rapid Release version 21 March 2001
  • Latest Rapid Release version 03 March 2008 revision 035
  • Initial Daily Certified version 21 March 2001
  • Latest Daily Certified version 03 March 2008 revision 037
  • Initial Weekly Certified release date pending
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When executed, the worm copies itself to the \Windows\System folder as these files:
  • C:\Windows\AD3.vbs
  • C:\Windows\System\Miss.vbs
  • C:\Windows\System\Kelly.vbs
  • C:\Windows\System\Rainbow.vbs
  • C:\Program Files\Norton AntiVirus\NMain.exe
  • C:\Program Files\Norton AntiVirus\NAVW32.EXE
  • C:\Program Files\Norton AntiVirus\Nsched32.exe
  • C:\Program Files\Symantec\LiveUpdate\LUAll.exe
  • C:\Program Files\AntiViral Toolkit Pro\Avpm.exe
  • C:\Program Files\Trend PC-cillin 98\PCCWIN98.exe
  • C:\Program Files\Trend PC-cillin 2000\Pccmain.exe
  • C:\Program Files\Trend PC-cillin 98 PLUS!\Pccwin98.exe

NOTE: Some of these files use the same file name as legitimate program files. They may be in different locations from the original program files, or they may be copied to the same locations and overwrite the original program files.

For each drive, including network drives, the virus attempts to infect files that have .js, .jse, .wsh, .css, .pwl, and .hta extensions. The worm also searches for files with the extensions .jpg, .gif, and .bmp. When files with these extensions are found, the worm makes copies of the files and adds the .vbe extension to the file name. For example, if a file is named House_pics.jpg, the overwritten file is named House_pics.jpg.vbe. The original file is then deleted. These files must be deleted and then restored from a backup.

CAUTION: Do not attempt to run files that have been overwritten or renamed by this worm. If you do, the worm will be executed again.

The worm uses MAPI calls to Microsoft Outlook, and creates messages by going through all of the addresses in the Microsoft Outlook address book. The worm uses the Windows registry to keep track of those who have been sent the message, so that each is sent only one email message.

The subject of the message is one of the following:

fw: DO YOU MISS ME ?
fw: I MISS YOU VERY MUCH.
fw: DO YOU COME BACK ?
fw: I MISS YOU SO I WAIT YOU.

The body of the message is:

Kelly...Where are you ? I will wait you 3 years.i miss you...Rainbow

The attachment is one of the following:
  • miss.vbs
  • rainbow.vbs
  • kelly.vbs
  • 530.vbs

Summary of modified registry entries
The following registry keys may be added:

HKEY_CURRENT_USER\Software\
Microsoft\Office\9.0\Word\Security\

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run\AD3

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run\miss

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run\Kelly

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run\rainbow

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run\AD3

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices\PCCIOMON.EXE

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Network\Installed

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Network\LanMan\530\Path

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\ProxyServer

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\Start Page

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.

Because the worm copies files that have the same file names as legitimate files to the hard disk, if the worm has already executed, Norton AntiVirus may have to be reinstalled. Follow these steps:
  1. Try to start Norton AntiVirus (NAV). What you do next depends on whether or not it starts.
    • If NAV starts:
      1. Run LiveUpdate to make sure that you have the most recent virus definitions. Run a full system scan, making sure that NAV is set to scan all files.
      2. Delete any files detected as VBS.Kelly.A@mm.
      3. Using Windows Explorer, look for the following files and delete any that you find:

        CAUTION: If you use the Find Files or Search utility to locate these, make sure that you only delete the files in the locations shown.
        • C:\Windows\AD3.vbs
        • C:\Windows\System\Miss.vbs
        • C:\Windows\System\Kelly.vbs
        • C:\Windows\System\Rainbow.vbs
        • C:\Program Files\Norton AntiVirus\NMain.exe
        • C:\Program Files\Norton AntiVirus\Nsched32.exe
        • C:\Program Files\AntiViral Toolkit Pro\Avpm.exe
        • C:\Program Files\Trend PC-cillin 98\PCCWIN98.exe
        • C:\Program Files\Trend PC-cillin 2000\Pccmain.exe
        • C:\Program Files\Trend PC-cillin 98 PLUS!\Pccwin98.exe
      4. Go on to the section titled Edit the registry.
    • If NAV does not start:
      1. Using Windows Explorer, look for the following files and delete any that you find:

        CAUTION: If you use the Find Files or Search utility to locate these, make sure that you only delete the files in the locations shown.
        • C:\Windows\AD3.vbs
        • C:\Windows\System\Miss.vbs
        • C:\Windows\System\Kelly.vbs
        • C:\Windows\System\Rainbow.vbs
        • C:\Program Files\Norton AntiVirus\NMain.exe
        • C:\Program Files\Norton AntiVirus\NAVW32.EXE
        • C:\Program Files\Norton AntiVirus\Nsched32.exe
        • C:\Program Files\Symantec\LiveUpdate\LUAll.exe
        • C:\Program Files\AntiViral Toolkit Pro\Avpm.exe
        • C:\Program Files\Trend PC-cillin 98\PCCWIN98.exe
        • C:\Program Files\Trend PC-cillin 2000\Pccmain.exe
        • C:\Program Files\Trend PC-cillin 98 PLUS!\Pccwin98.exe
      2. Follow the instructions in the section Edit the registry. When you have finished editing the registry, return to this section and then go on to step 3.
      3. Reinstall NAV.
      4. Run LiveUpdate to make sure that you have the most recent virus definitions.
      5. Run a full system scan, making sure that NAV is set to scan all files.
      6. Delete any files detected as VBS.Kelly.A@mm.
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_CURRENT_USER\Software\Microsoft\
    Windows\CurrentVersion\Run
  4. In the right pane, delete the following values:

    AD3
    miss
    Kelly
    rainbow
  5. Navigate to the following key:

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

    AD3
  7. Navigate to the following key:

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

    PCCIOMON.EXE
  9. Delete the following keys:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\
    CurrentVersion\Internet Settings\ProxyServer

    HKEY_CURRENT_USER\Software\
    Microsoft\Office\9.0\Word\Security\

    HKEY_LOCAL_MACHINE\Software\Microsoft\
    Windows\CurrentVersion\Network\Installed

    HKEY_LOCAL_MACHINE\Software\Microsoft\
    Windows\CurrentVersion\Network\LanMan\530\Path
  10. Click Registry, and click Exit to save your changes and close Registry Editor.


Writeup By: Douglas Knowles