Threat Descriptons



Category :


Type :


Platform :


Aliases :



W97M/Nono is a macro virus that uses different module names depending on the user's initials.


This virus gets control when an infected document is opened. It then disables the Word's built-in macro virus protection.


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

During infection, it creates three files to the root directory of the C: drive.

First it creates a file containing the virus code. To name this file the virus uses user's initials (for example, "JD" for John Doe).

After that it infects the global template. It creates a new module ("ThisDocument") to the global template containing the code that will get control when the Word is started.

Then it creates a file using the name "True.bat" or "False.bat". This file is used to copy the infected template to the Word's startup directory.

When Word is started and the infected template gets control through the copy in the startup directory, the virus checks if the virus has been removed from the global template, for example user has deleted the "NORMAL.DOT". If so it creates yet another file, "v1.bas". This file is used to restore the virus to the global template.

When the global template is infected, the virus will attempt to infect every document that is closed.

Additionally the virus hooks both the "Tools/Macros/Macro" and "Tools/Macros/Visual Basic Editor" menus.

When an infected document is opened, the virus will test if minutes of the system time is 30 and seconds are greater than 15. If the test passes then one of the two payloads will be activated.

Every 10th of each month it will display a dialog with a following title:


and the following text:

Run Animation?

The dialog contains two buttons. If user selects "Yes", the dialog will be redisplayed, but if user selects "No" the dialog will be closed and no futher action will be taken.

In every other day it will change the Word's window caption to:


This text will be scrolled in the status bar as well. After scrolling Next, it changes the status bar to:

>:-) VicodingES

At this point the title text will be changed once more to:

Microsoft Word Loves (UserName)

where "(UserName)" will be the current user name. The same text will be inserted to the active document.

More Support


Ask questions in our Community .

User Guides

Check the user guide for instructions.

Contact Support

Chat with or call an expert.

Submit a Sample

Submit a file or URL for analysis.