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Types of Computer Virus

• Boot Sector Virus

Infect sharing of infected disks and pirated software applicationss the boot. Once your hard drive is infected all diskettes that you use in your computer will be infected

• Program Virus

Becomes active when the program file (usually with extensions .BIN, .COM, .EXE, .OVL, .DRV) carrying the virus is opened

It then makes copies of itself and will infect other programs on the computer

• Multipartite Virus
• Hybrid of a Boot Sector and Program viruses
• It infects program files and when the infected program is active it will affect the boot record

Types of Viruses

• Stealth Virus
• Disguises itself to prevent from being detected by antivirus software
• It alters its file size or conceals itself in memory
• Polymorphic Virus
• Act like a chameleon, changing its virus signature (binary pattern) every time it multiples and infects a new file
• Macro Virus
• Programmed as a macro embedded in a document, usually found in Microsoft Word and Excel
• Once it gets in to your computer, every document you produce will become infected
• Relatively new type of virus and may slip by your antivirus software if you don't have the most recent version installed

Signs Your Computer is Infected

• Functions slower than normal
• Responds slowly and freezes often
• Restarts itself often
• See uncommon error messages, distorted menus, and dialog boxes
• Notice applications fail to work correctly
• Fail to print correctly