1. Computer virus Done: Aaesha Mohammed ID: H00202574

2. Outline:  What is a computer virus?  Worm  E-mail Viruses  Types of Viruses  Symptoms of Virus Attack  How the attack computer  How to protect the computer

3. What is a computer virus?  Computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation.

4. Worm  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.

5. 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”

6. Types of Viruses  File infector virus  Infect program files  Boot sector virus  Infect the system area of a disk  Master boot record virus  infect disks in the same manner as boot sector viruses. The difference between these two virus types is where the viral code is located.  Multi-partite virus  infect both boot records and program files  Macro virus  infect data files. Examples: Microsoft Office Word, Excel, PowerPoint and Access files

7. Symptoms of Virus Attack  Computer runs slower then usual  Computer no longer boots up  Screen sometimes flicker  PC speaker beeps periodically  System crashes for no reason

8. How the attack computer  can be disguised as attachments of funny images, greeting cards, or audio and video files.  Computer viruses also spread through downloads on the Internet.

9. How to protect the computer  Upload the latest updates  Antivirus tools  Stay informed about recent threats,  Run your computer as a standard user (not as administrator  Follow a few basic rules when you surf the Internet, download files, and open attachments.

10. Refernces  http://www.webopedia.com/TERM/V/virus.html http://www.webopedia.com/TERM/V/virus.html  http://en.wikipedia.org/wiki/Computer_worm http://en.wikipedia.org/wiki/Computer_worm  http://computer.howstuffworks.com/virus4.htm http://computer.howstuffworks.com/virus4.htm  http://www.makeuseof.com/tag/types-computer- viruses-watch/ http://www.makeuseof.com/tag/types-computer- viruses-watch/