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W97M/Chack is a rather simple Microsoft Word 97 macro virus.


Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details


When an infected document is opened the virus gets control. It will then disable the built-in macro virus protection and modify the customizations of Word. It disables both ALT+F8 (Tools/Macros/Macro) and ALT+F11 (Tools/Macros/Visual Basic Editor) keyboard shortcuts, removes the entire Tools/Macros submenu and disables the Visual Basic toolbar.

Then it will infect the global template. After that the virus will infect every document that is opened, created, or saved. Additionally it will hook Tools/Customize and Tools/Organizer menus.

The virus replaces the Help/About dialog with a dialog that contains a picture, a checkbox and two buttons. The same dialog will be shown in every Friday when user attempts to exit Word.

The virus code contains the following text:

 Macros By WinK'S Hacker
 Picture By Casper Satan
Lebih baik mencoba dari pada tidak tahu sama sekali ...
 Mohon ma'af bila telah mengganggu Anda.
 Microsoft memang gila ! Nambahin fasilitas pemrogramannya
 keterlaluan untuk suatu word prosesor.
 jangan harap kau datang lagi padaku


W97M/Chack.C is similar to W97M/Chack.A. The only difference is that it does not hook "Tools/Macros/Macro" menu.


This variant is almost identical with W97M/Chack.A. It will not hook the "File/Save" menu selection, and the last line of the text in the virus code is missing.


W97M/Chack.AI is a slightly modified variant that does not hook "File/Save" or "Tools/Macros/Macro".