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This document discusses different types of computer viruses and harmful programs. It describes viruses as programs that attach themselves to other programs and spread across systems. There are macro viruses, file infectors, resident viruses, network viruses, logic bombs, boot sector viruses, multipartite viruses, and stealth viruses. It also discusses Trojan horse programs and worms. The document provides tips on how to protect systems by installing and updating antivirus software, being careful when downloading files, scanning removable media, using firewalls, and avoiding pirated software.
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You are now upgraded to Grad Level.
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- 2. At Glance What is Virus? Hackers & Crackers Types of Computer Viruses Some other Harmful Programs How you Protect your System against Viruses ?
- 3. A virus is a program that enters the computer system by attacking itself to another program and then spreads itself across the system.
- 4. There are two different types of people who write computer virus programs Hackers Crackers Hackers refers to the people who use their skills to enter into computer system without authorization. Hackers are computer enthusiasts, who break into secure systems to gain knowledge about them and possibly use their knowledge to play pranks. A Cracker is malicious programmer who gain unauthorized access to computer system for the purpose of stealing, altering or corrupting information.
- 5. There are so many types of computer viruses. Some of them are : Macro Virus File Infector Resident Virus Network Virus Logic Bomb Boot Sector Virus Multipartite Virus Stealth Virus
- 6. A macro virus is a computer virus that "infects" a Microsoft Word or similar application and causes a sequence of actions to be performed automatically when the application is started or something else triggers it. Macro viruses tend to be surprising but relatively harmless. A typical effect is the undesired insertion of some comic text at certain points when writing a line. A macro virus is often spread as an e- mail virus. A well-known example in March, 1999 was the Melissa virus virus.
- 7. Phrasp the most common type of virus, the file infector takes root in a host file and then begins its operation when the file is executed. The virus may completely overwrite the file that it infects, or may only replace parts of the file. Some file infector viruses attack themselves to program file, usually selected .COM or .EXE file.
- 8. A board virus definition applies to any virus that inserts itself into a systems memory
- 9. A kind of virus spreads across networks in computers, for example, Nimda and SQL SLAMMER worms are viruses which spread over corporated networks or the internet via e-mails.
- 10. A logic Bomb is a program that get executed only when specific condition is met. The virus: Friday the 13th, , was so programmed so as to get executed on that perticular date.
- 11. A boot sector virus hides in the boot sector of hard disk. The boot sector is where your operating system is. So every time you boot your computer the virus gets loaded into the computer memory. Examples of boot-sector viruses are Polyboot B, AntiEXE.
- 12. This virus is spread by infected floppies and CDs. These viruses first infect the boot sector of hard drive and then infect the executable files stored in it. For ex.- Ywinz.
- 13. These are some virus which try to hide themselves from Anti-virus software by resorting some tricks. Stealth virus can safely show an anti-virus software that a certain file is uninfected.
- 14. A Trojan Horse program is a file that appears harmless unless it has executed. The Trojan Horse program disguises itself as a game or a utility program but when executed it can destroy the data stored in the computer. The name Trojan Horse has been derived from Greek mythology.
- 15. Worms are small pieces of software that use computer network and security holes to replicate itself. Worms on the internet spread by e-mail it searches for all the address book of the mailing system. It then mails to all recipients.
- 16. Install a good Anti-Virus software on your computer. Update Anti-Virus regularly. Be careful while Downloading files or programs from the internet.
- 17. Always scan your floppies, CDs, flash drives before using them. Do not use pirated software. Turn on firewall of your computer operating system.
- 18. Presented By: