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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. E-mail viruses : 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. 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. Worms : Worms A worm is a small piece of software that uses computer networks and security holes to replicate itself. A copy of the worm scans the network for another machine that has a specific security hole. It copies itself to the new machine using the security hole, and then starts replicating from there, as well. A worm is a computer program that has the ability to copy itself from machine to machine. Worms use up computer time and network bandwidth when they replicate, and often carry payloads that do considerable damage. A worm called Code Red made huge headlines in 2001. Experts predicted that this worm could clog the Internet so effectively that things would completely grind to a halt. Virus History : Virus History Traditional computer viruses were first widely seen in the late 1980s, and they came about because of several factors. The first factor was the spread of personal computers (PCs). Prior to the 1980s, home computers were nearly non-existent or they were toys. Real computers were rare, and they were locked away for use by "experts." During the 1980s, real computers started to spread to businesses and homes because of the popularity of the IBM PC (released in 1982) and the Apple Macintosh (released in 1984). By the late 1980s, PCs were widespread in businesses, homes and college campuses. Top 10 viruses announced by Symantec Corporation: : Top 10 viruses announced by Symantec Corporation: 01. Storm Worm 02. Leap-A/Oompa-A 03. Sasser and Netsky 04. MyDoom 05. SQL Slammer/Sapphire 06. Nimda 07. Code Red and Code Red II 08. The Klez Virus 09. ILOVEYOU 10. Melissa How to Protect Your Computer from Viruses : How to Protect Your Computer from Viruses You can protect yourself against viruses with a few simple steps: If you are truly worried about traditional (as opposed to e-mail) viruses, you should be running a more secure operating system like UNIX. You never hear about viruses on these operating systems because the security features keep viruses (and unwanted human visitors) away from your hard disk. Antivirus software : Antivirus software A utility that searches a hard disk for viruses and removes any that are found. Most antivirus programs include an auto-update feature that enables the program to download profiles of new viruses so that it can check for the new viruses as soon as they are discovered. How Anti Virus Software Works : How Anti Virus Software Works Virus definition files tell the anti virus software what code characteristics to look for while monitoring your computer. When a certain file type or activity occurs that matches a characteristic, the anti virus software blocks the execution of code and alerts you that a virus has been found. The virus is then isolated and destroyed. Hundreds of new computer viruses are introduced onto the internet each week, and as antivirus software developers find these new viruses, they create updates of the virus “definitions” in order to provide the antivirus software with a way to identify and destroy even the newest of viruses. It is extremely important to update your antivirus software every day in order to make sure you have the most current virus definitions available. Fortunately, most modern anti virus software comes with an “automatic update” feature that makes this task a one time “set it and forget it” kind of thing. Top 10 antiviruses : Top 10 antiviruses 01. Shield Deluxe - Antivirus Protection 02. Trend Micro Antivirus Internet Security 03. BitDefender Antivirus 2009 04. Norton Antivirus 05. McAfee VirusScan 06. Grisoft AVG 7.5 Professional 07. Panda Antivirus 08. ZoneAlarm Anti-virus 09. ESET NOD32 Antivirus 10. Kaspersky Anti-Virus Steps to help remove a virus: : Steps to help remove a virus: Visit Microsoft Update and install the latest updates. If you currently use antivirus software, visit the manufacturer's Web site, update your software, and then perform a thorough scan of your computer. If you don't use antivirus software, subscribe to a service and scan your computer immediately. Download, install, and run the Malicious Software Removal Tool. Note that this tool does not prevent viruses from infecting your system; it helps to remove existing viruses. How does anti-virus software work? : How does anti-virus software work? An anti-virus software program is a computer program that can be used to scan files to identify and eliminate computer viruses and other malicious software (malware). You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.