Threat Description

Virus: ​W97M/Argh

Details

Category: Malware
Type: Virus
Platform: W97M
Aliases: Virus:​W97M/Argh

Summary


Virus:W97M/Argh is a small family of macro viruses that infect Microsoft Word documents.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details


At random intervals, the virus will display a message while executing its infection routine. The message is shown with the balloon Assistant, and appears as follows:

title: Help me Message: I'm not feeling very well .. AAARGHH!!!  

This family has one known variant, Virus:WM/Argh.B, which is functionally identical to Virus:WM/Argh.A.

Infection

Argh infects global template when an infected document is opened and creates two copies of the "NORMAL.DOT" to the Word installation directory, "WINDOT.DLL" and "WININF.DLL".

Subsequently, the virus infects all documents that are created, opened or saved.

The "File/Macros/Macro" menu selection is replaced as well with a message box containing the following text:

 Microsoft is protecting your normal.dot from virus infection. You can only add macros to other documents  

This selection is only available when there is no documents open in Word.


Variant:Argh.A

W97M/Argh.A infects the Word's global template when an infected document is opened and creates two copies of the "NORMAL.DOT" to the Word installation directory, "WINDOT.DLL" and "WININF.DLL". After this has been done, the virus infects all documents that are created, opened or saved. It also changes the Assistant animation, and it sometimes shows a message while it infects the global template or the active document. This message is shown with the balloon Assistant, and it contains the following title: Help me and the following text:

I'm not feeling very well .. AAARGHH!!!  

The "File/Macros/Macro" menu selection is replaced as well with a message box containing the following text: Microsoft is protecting your normal.dot from virus infection You can only add macros to other documents This selection is only available when there is no documents open in Word.


Variant:Argh.B

W97M/Argh.B is functionally identical with W97M/Argh.A, except this variant does not hook the "Tools/Macros/Macro" menu.






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