A macro virus or macro worm is executed when the application object that contains the macro is opened or a particular procedure is executed.

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A macro virus or worm is attached to a macro within an application object like a Microsoft Word document or Excel spreadsheet. It is triggered when the macro is opened or activated, which can happen when the user launches the document or performs a specific action within it.

A Macro Virus or Macro Worm Is Executed When the Application