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OCR: DATA ECURITY AND CONTRO InfoWeb macro virus infects documents such as those created with pord processor. Infected documents are stored with list of instructions called macro macro essentially miniature program that usually contains legitimate instructions to automate document pro- duction However hacker can create destructive attach to document and vacrc Viruses then distr ibute it ov er the Internet or on When anyone views the document the macro virus duplicate s itself into the general macro pool where it is up Aq other docu- ments The two mo st common macro viruses are the Concept virus that attaches to Microsoft documents and Laroux that attaches to Microsoft Excel spreadsheets Experts say there are over 2000 viruses However 90 percent o virus damage IS caused by fewer than 10 viruses ...