Microsoft Office macro viruses are back that infect Word documents.
We’ve been encountering macro viruses that specifically infect Microsoft Office programs such as Microsoft Word.
Macros are a part of Word and Excel and allow the user to speed up repetitive editing and formatting of Word documents.
Check out the following Microsoft article that explains in more detail “What are Word Macro Viruses” and how to determine if you have one: https://support.microsoft.com/en-us/kb/187243