Macro Viruses

Macro Viruses
Microsoft Word or similar applications can be infected through a computer virus called macro virus, which automatically performs a sequence of actions when the application is triggered or something else. Most macro viruses are written using the macro language Visual Basic for Applications(VBA) and they infect templates or convert infected documents into template files, while maintaining their appearance of ordinary document files. Macro viruses are somwhat less harmful than other types. They are usually spread via an email. Pure data files do not allow the spread of viruses, but sometimes the line between a data file and an executable file is easily overlooked by the average user due to the extensive macro languages in some programs. In most cases, just to make things easy for users, the line between a data file and a program starts to blur only in cases where the default macros are set to run automatically every time the data file is loaded. Virus writers can exploit common programs with macro capability such as Microcode. In addition, the latest exploited macrocode exists in the full version of the Acrobat program that reads and writes PDF files.