Macro virus

 
This type of virus is certainly very often we hear. This virus was written with 
programming language of an application is not the programming language of an Operating System. This virus can be run when the application can creating it self 
running well. For example, if the computer is run mac application 
Word, the macro virus that is made from the Word macro language can be worked on 
system Mac computer is operating. 
Examples of viruses: 
- Variant W97M, eg W97M.Panther 
Length of 1234 bytes, will infect NORMAL.DOT and infect document 
when opened. 
- WM.Twno.A; TW 
The length of 41,984 bytes, will infect document using Ms.Word 
macro language, usually extention: . . DOC and DOT