VBA (Visual Basic for Applications)

VBA (Visual Basic for Applications) is a subset of Microsoft's proprietary
Visual Basic programming language. It is designed to run solely within
Microsoft Word and Excel in order to automate repetitive operations and
create custom commands or toolbar buttons. It's a primitive language as these
things go, but it is capable of importing outside libraries including the entire
Windows API. As such we can do a lot with it besides drive spreadsheets and
manage mailing lists.
The VBA macro has a long history as a means of delivering malware, but that
doesn't mean it is any less effective today than it's ever been. On the contrary,
in modern versions of Microsoft Office (2010 onward), the default behavior of
the application is to make no distinction between signed and unsigned code.
There are two reasons for this. The first is that code-signing is about as
effective as rain dancing as a means of blocking hostile code and because
Microsoft got tired warning people of the dangers of using its core scripting
technologies.

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