Computer virus Done: Aaesha Mohammed ID: H00202574

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

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.

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.

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”

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

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

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.

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.

Refernces

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

watch/