SS3 Second Term Data Processing Lesson Note – Computer Virus

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WEEK  4

CLASS: SS 3                                                            

TOPIC:  COMPUTER VIRUS

CONTENT: 

• Meaning of Computer Virus.
• Types of Computer Virus.
• Examples of Virus
• Sources of Virus

SUB-TOPIC 1:  Meaning of Computer virus

A computer virus is a type of malicious software program (“malware”) that, when executed, replicates itself by modifying other computer programs and inserting its own code.

A computer virus is an executable program that is capable of replicating itself thereby causing great harm to files or other programs on the computer it infects. A computer virus can spread easily from one computer to another with the use of a storage media such as: Flash drives, floppy, etc.

Types of Computer Virus

The two most common type of computer virus are;

1. Virus file infectors
2. System or boot sector infectors
3. E-mail virus
4. Key logger
5. Malware: These include;

1. Worms: A worm is a virus program that copies and multiplies itself by using computer networks and security flaws. A classic example of a worm is the I LOVE YOU virus discovered in 2000. Another latest worm was discovered in July 2010 called Stuxnet.
2. Trojan horse: A Trojan horse is a computer program or file on the computer of a user that makes the computer susceptible to malicious intruder by allowing them to access and read users files. They do not multiply themselves as in the case of worm. An example of latest Trojan horse is Alureon (discovered in 2010).

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