A Macro Virus adds its code to the macros associated with documents, spreadsheets and other data files. The majority of them were designed to spread on the back of Microsoft Office data files, such as Word documents and Excel spreadsheets. A macro virus can cause damage by overwriting text or deleting sections of data when you perform an action that triggers it to run. Modern applications now have built-in protection that warns you if a macro is present before you open the file.
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