2. COMPUTER VIRUSES.

3. Definition Of a Computer Virus Computer Viruses Origin Types of Computer Viruses How Does Viruses Attack Computer. How Does a Viruses Spreads inside a Computer. Reproduction of Computer Viruses. Top Five Report. Antivirus Strategy Conclusion Reference s.

4. Computer Viruses – Artificial Life. COMPUTER VIRUS IS A KIND OF MALICIOUS SOFTWARE WRITTEN INTENTIONALLY TO ENTER A COMPUTER WITHOUT THE USER’S PERMISSION OR KNOWLEDGE, WITH AN ABILITY TO REPLICATE ITSELF. SOME VIRUSES DO LITTLE BUT REPLICATE OTHERS CAN CAUSE SEVERE HARM OR ADVERSELY EFFECT PROGRAM AND PERFORMANCE OF THE SYSTEM. A VIRUS SHOULD NEVER BE ASSUMED HARMLESS AND LEFT ON A SYSTEM.

5. Viruses History. Since the age of technology arose, and the twentieth century of computers came about, there have always been an attempt from those trying to be “smarter” then the average computer. The very famous Fred Cohen who "wrote the book" on computer viruses. He was able to use his logic to test several hypothesis about computer virus’s.

6. Different Types Of Computer Viruses Known. 1. Direct Action Viruses. 2. Resident Viruses. 3. Overwrite Viruses. 4. Boot Virus. 5. Macro Virus. 6. Directory Virus. 7. Polymorphic Virus. 8. File Infectors. 10. Companion Viruses. 11. FAT Virus. 12. Worms. 13. Trojans or Trojan Horses. 14. Logic Bombs.

7. How can A viruses Attack Computer. 1. Viruses can infect your computer by reading, or even, previewing, email. There are many ways that you can find out what these email infectors are and take the steps to prevent an infection. 2. Spreads from computer to computer when the host is taken to the uninfected computer over a network such as over the Internet or carrying it on a removable medium - a floppy disk, CD, or USB drive

8. How does a Virus spreads inside a Computer

9. Reproduction Typically, its first objective is to replicate (or reproduce) “Virus programs, typically written in machine code, usually employ DOS commands to commandeer system resources that the virus must use.” This := findfile LOAD (this) loc := search (this) insert (loc) STORE (this) ****** findfile search insert

10. Trigger & Bomb day/date := check(clock) if day = 5 and date = 13 then bomb check bomb check – uses DOS commands to read the system clock and assigns the appropriate values to day and date bomb – this is the heart of the virus, what does all the damage

11. TOP 5 VIRUS’S REPORTED

12. No Laughing Matter 1. U.S. Businesses lost $5 billion to $6 billion due to computer viruses 2. Viruses have penetrated the so said safest computers of: 3. NASA 7. The Defense Data Network 8. The 2 nd Circuit Court of Appeals 4. Capitol Hill 5. IBM 9. The White House 6. A British Nuclear Power Plant 10. The Naval Ocean Systems Command 11. At least 2 viruses infiltrated Allied computers in 1991 during the Gulf War

13. ANTI VIRUSES’ STRATEGY Knowledge Antivirus software Backup Macro Protection

14. 1. Generally thought upon as being awful human creations, the existence of computer viruses, however, has opened the world’s eyes to the potential powers they possess. 2. How susceptible we are to our own ingeniousness 3. As much as the computer revolution has helped mankind in its quest for omniscience, there will always be a force that deters our effort 4. Chinese saying, “For every Yin, there is a Yang”

15. REFERENCES. www.google.com. www.altavista.com. www.howstffworks.com. www.uri.edu/personal/dbru7007/biblio.html

16. Thank You.