xlsx file extension, as they are incapable of storing a macro and will not carry any threat.Įxcel workbooks with macros are saved with. The most important Excel macro security feature is - file extensions.Įxcel workbooks will be saved with. Microsoft has introduced macro security so that you can identify which macros you can trust and which you cannot. However, Microsoft has taken appropriate measures to shield the workbooks from macro viruses. Therefore, Excel macros can be very dangerous to your computer in many ways. Hence, there is a potential threat of the existence of a virus written as a macro and is hidden within Excel that are executed on opening a workbook. What are Macro Viruses?Įxcel VBA in which the Macros are written has access to most Windows system calls and executes automatically when workbooks are opened.
As you are aware, when there is an executable code, there is a threat of viruses. You will learn about the Excel macro code in later chapters. The macros that you create in Excel would be written in the programming language VBA (Visual Basic for Applications).
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