1. Symantec/
  2. Security Response/
  3. W97M.Chameleon.I


February 6, 2004
February 13, 2007 12:17:06 PM
Also Known As:
Macro.Word97.Chameleon.c [Kasp, W97M/Chameleon.I [F-Prot], W97M_CHAMELEON.C [Trend], W97M/Chameleon.C.dr [GeCAD]
Systems Affected:
Mac, Windows

When a document infected with W97M.Chameleon.I is opened, the virus performs the following actions:
  1. Checks the value:


    in the registry key:


    to see if it is set with non-empty, string data. If so, the virus disables the Word's menu items:
    • Tool > Macro
    • Tool > Templates and Add-ins...
    • Format > Style Gallery...

      otherwise it disables the menu item:
    • Macro > Security...

  2. Disables user interrupts to Visual Basic for Application procedures, which can be done by pressing ESC, or the CTRL + BREAK keys.

  3. Disables the built-in warning message in Microsoft Word, which is displayed when opening a document that might contain macro viruses.

  4. Disables the option to display a prompt message when you open documents that are not in Microsoft Word format.

  5. Disables the option to display a prompt message when saving changes to the Normal.dot template.

  6. Disables the option to display a prompt message for document property information when saving a document.

  7. Infects the Normal.dot template.

  8. Drops the file, Quiet.vbs, in the C:\Windows\Start Menu\Programs\Startup folder, if present.

    Note: The Quiet.vbs file contains the virus known as VBS.Chameleon.C.

  9. Creates the Quiet.dll file in the folder C:\Windows\System, if present.

    Note: This file is empty and does not contain virus code.

Writeup By: Keiichi Ito
Summary| Technical Details| Removal

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