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The program claims to do one thing (it may claim to be a game) but instead does damage when you run it (it may erase your hard disk). Trojan horses: A Trojan horse is simply a computer program.Some e-mail viruses don't even require a double-click - they launch when you view the infected message in the preview pane of your e-mail software. E-mail viruses: An e-mail virus travels as an attachment to e-mail messages, and usually replicates itself by automatically mailing itself to dozens of people in the victim's e-mail address book.Each time the spreadsheet program runs, the virus runs, too, and it has the chance to reproduce (by attaching to other programs) or wreak havoc. For example, a virus might attach itself to a program such as a spreadsheet program.

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Viruses: A virus is a small piece of software that piggybacks on real programs.

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Protecting your Computer SystemTo ensure that your OS is up-to-dateTo have antivirus software and make sure it hasthe capability to scan e-mail and files as they aredownload from the internetNeed to run full disk scans periodicallyUse a Firewall. Types of virusesпѓStealth VirusпѓPolymorphic VirusпѓParasitic VirusпѓMemory-resident VirusпѓBoot Sector Virus Phases of a worm or virus operationпѓDormant PhaseпѓPropagation PhaseпѓTriggering PhaseпѓExecution Phase Д¬haracteristics of a WormпѓEnhanced TargetingпѓEnhanced SpeedпѓEnhanced CapabilitiesпѓEnhanced Destructive Power A worm spreads from system to systemautomatically, but virus needs another program inorder to spread.

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The virus code isinjected into the previously benign program and isspread when the program is run.Examples of virus carrier programs are games, e-mail attachments and animationsA worm is a malicious software which replicatesitself. Дifference between viruses and worms.A virus an worms are similar in that they are bothforms of malicious software. It uses computer network to spread itself.It consumes too much system memoryInfects the environment rather than specificobjectsWorms send a copy of itself to everyonelisted on your email address book. Worms spread from one computer to another it hasthe capability to travel without any human action.It is an independent program that does not modifyother programs, but reproduces itself over and overagain until it slows down or shuts down a computersystem or network. WORMSA worm is similar to view by design and isconsidered to be a sub-class of a virus. Ways to infect computer systems throughviruses.пѓBoot Sector PenetrationпѓMacros PenetrationпѓParasites How they work:Basic structure:DoesnвЂ™t remain in memory, but executes all ofthe viral code at once then returns control to theinfected program ДЄ virus cannot be spread without ahuman action (such as running aninfected file or program) to keep it going.A virus is spread by sharing files or sending emails with viruses as attachments in the email.

Almost all viruses are attached to an executable file which means the virus may exist on computerbut it actually infect our systems unless we run or open the malicious program. VIRUSViruses are malicious programs that can cause damage to computer.A computer virus attaches itself to a program or file enabling it to spread from one computer to another leaving infections as it travels.