Computer viruses

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Computer viruses

  1. 1. Computer VirusesPresented BySHopNiL MaHmuD<br />A Short Technical Report On <br />
  2. 2. What is Computer Virus?<br />A computer virus is a computer program that can copy itself and infect a computer without the permission or knowledge of the owner. <br />The term "virus" is also commonly but erroneously used to refer to other types of malware, adware, and spyware programs that do not have the reproductive ability.<br />The term "computer virus" is sometimes used as a catch-all phrase to include all types of malware.<br />
  3. 3. How Viruses Work?<br />A true virus can only spread from one computer to another (in some form of executable code) when its host is taken to the target computer; for instance because a user sent it over a network or the Internet, or carried it on a removable medium such as a floppy disk, CD, DVD, or USB drive.<br />Viruses can increase their chances of spreading to other computers by infecting files on anetwork file system or a file system that is accessed by another computer.<br />
  4. 4. Types of Viruses<br />Viruses - A virus is a small piece of software that piggybacks on real programs.<br />E-mail viruses - An e-mail virus travels as an attachment toe-mail messages, and usually replicates itself by automatically mailing itself to dozens of people in the victim's e-mail address book.<br />Trojan horses - A Trojan horse is simply a computer program.<br />Worms - A worm is a small piece of software that uses computer networks and security holes to replicate itself.<br />
  5. 5. How Virus Can infect Your Computer<br />Like biological virus transform into human bodies, computer virus can also pass from one computer to another.<br />In order to replicate itself, a virus must be permitted to execute code and write to memory.<br /> If user attempts to launch an infected program, the virus' code may be executed simultaneously and multiply itself.<br />
  6. 6. Virus History & Background<br />Traditional computer viruses were first widely seen in the late 1980s, and they came about because of several factors.<br />When PC’s were started using widespread, virus were created by the programmers.<br />And this trend increased day by day ...<br />
  7. 7. Worst 10 Viruses of The History<br /><ul><li>Worst Computer Virus 10: Melissa (1999)
  8. 8. Worst Computer Virus 9: ILOVEYOU (2000)
  9. 9. Worst Computer Virus 8: The Klez Virus (2001)
  10. 10. Worst Computer Virus 7: Code Red and Code Red II (2001)
  11. 11. Worst Computer Virus 6: Nimda (2001)
  12. 12. Worst Computer Virus 5: SQL Slammer/Sapphire (2003)
  13. 13. Worst Computer Virus 4: MyDoom (2004)
  14. 14. Worst Computer Virus 3: Sasser and Netsky (2004)
  15. 15. Worst Computer Virus 2: Leap-A/Oompa-A (2006)
  16. 16. Worst Computer Virus 1: Storm Worm (2001)</li></li></ul><li>How To prevent Virus<br />Using protected operating system such as Linux, Mac etc would help a great deal to prevent virus infection.<br />Run virus protection software that are easily available in the market and keep them up to date.<br />Avoid programs from unknown sources.<br />For email viruses, take precaution before opening any unknown attachment from unknown sender.<br />Spot the hoax.<br />
  17. 17. Stay Aware & Be Conscious<br />Virus can easily be avoided if we stay conscious about it. <br />Virus is not always a bad thing because it can be used in better purposes.<br />It depends on the purpose you use it.<br />Let’s have a safe and sound future of IT.<br />The exciting stories of viruses can not be presented in such a short time, But we’ve tried.<br />
  18. 18. Your questions about Virus?<br />Shopnil.d.rocker@gmail.com<br />

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