CSE computer virus.pptx. Computer virus.

Computer virus

1. www.studymafia.org Submitted To: Submitted By: www.studymafia.org www.studymafia.org Seminar On Computer Virus

2. Content Introduction What is Computer Virus Types of Infection Viruses E-mail viruses Worms Trojan horses Types of Computer Virus Difference between Virus and Worm Signs of a Computer Virus Preventions Top Seven Antiviral Program Conclusion Reference

3. I ntroduction A virus is a program designed by a computer programmer ( malicious hacker ) to do a certain unwanted function.

4. What is computer virus? Computer virus refers to a program which damages computer systems and/or destroys or erases data files.

5. Types of Infection VIRUSES E-MAIL VIRUSES WORMS TROJAN HORSES

6. VIRUSES A virus is a small piece of software that piggybacks on real programs. 2 main characteristics of viruses It must execute itself. It must replicate itself.

7. E-MAIL VIRUSES Moves around in e-mail messages. Usually replicate itself by automatically mailing itself to dozens of people in the victim’s email address book. Example “MELISSA VIRUS” Example “I LOVE YOU VIRUS”

8. Melissa Virus (March 1999) Melissa virus spread in Microsoft Word documents sent via e-mail. How it works ? Created the virus as word document Uploaded to an internet newsgroup Anyone who download the document and opened it would trigger the virus. Send friendly email messages to first 50 people in person’s address book.

9. Melissa Virus Melissa Virus was the fastest spreading virus ever seen. Forced a number of large companies to shut down their e-mail systems.

10. I Love You Virus (May,2000) Contained a piece of code as an attachment. Double Click on the attachment triggered the code. Sent copies of itself to everyone in the victim’s address book Started corrupting files on the victim’s machine.

11. WORMS Small piece of software that uses computer networks and security holes to replicate itself. Copy of the worm scans the network for another machine that has a specific security hole. Copy itself to the new machine using the security hole and start replicating. Example “CODE RED”

12. TROJAN HORSES A simple computer program It claim to be a game Erase your hard disk No way to replicate itself.

13. Types of Computer Virus Time Bomb Logical Bomb Boot Sector Virus Macros Virus Script Virus

14. Types of Computer Virus Time Bomb A time bomb is a virus program that performs an activity on a particular date . Logical Bomb A logical bomb is a destructive program that performs an activity when a certain action has occurred.

15. Types of Computer Virus Boot Sector Virus A boot sector virus infects boot sector of computers. During system boot, boot sector virus is loaded into main memory and destroys data stored in hard disk.

16. Types of Computer Virus… Macros Virus A macro virus is associated with application software like word and excel. When opening the infected document, macro virus is loaded into main memory and destroys the data stored in hard disk. Script Virus Commonly found script viruses are written using the Visual Basic Scripting edition (VBS) and the JavaScript programming languages.

17. Difference between Virus and Worm The difference between a worm and a virus is that a virus does not have a propagation vector. i.e., it will only effect one host and does not propagate to other hosts. Worms propagate and infect other computers. Majority of threats are actually worms that propagate to other hosts.

18. World-wide damage estimates Computer viruses cause a huge amount of damage worldwide. Damages from just one virus (The I Love You Virus) are estimated at $10 billion dollars. It is also estimated that 45 million people worldwide were affected. Costs come from restoring damaged systems, replacing lost information, steps taken to prevent attacks and steps taken to prepare to recover from attacks.

19. Case Jason, a 16 year old honor student, wrote a computer virus that causes 4 billion dollars of damage and impacted countless home and business computers. The authorities traced the virus to him. Jason says that he is very sorry and didn’t mean for it to get so out of hand. He said he was just fooling around to see if he could do it.

20. Signs of a Computer Virus Computer runs slower then usual Computer no longer boots up Screen sometimes flicker PC speaker beeps periodically System crashes for no reason Files/directories sometimes disappear Denial of Service ( DoS )

21. Prevention Updates Anti-Viruses More secure operating systems e.g. UNIX

22. Top Seven Antiviral Program Kespersky Antivirus Data fellows E-Plot Mcafee Antivirus Symantec Norton Antivirus Bit Defender 2010 Quick Heal Antivirus ESaSS ThunderBYTE

23. C onclusion Be aware of the new infections out there. Take precaution measures. Always backup your data. Keep up-to-date on new Anti virus software. Simply avoid programs from unknown sources.

24. Reference www.google.com www.wikipedia.com www.studymafia.org

25. Thanks