Computer Virus – SS3 Data Processing Lesson Note (First Term)

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Define computer virus
2. State and explain each type of computer virus

INSTRUCTIONAL TECHNIQUES: 

• Identification, 
• explanation, 
• questions and answers, 
• demonstration, 
• videos from source

INSTRUCTIONAL MATERIALS: 

• Videos, loudspeaker, 
• pictures, Data Processing for Senior Secondary Education by Hiit Plc,
• WAPB Computer Studies for Senior Secondary I by Adekunle et al,
• On-line Materials.

NOTE

Computer virus

A computer virus is a program intentionally written by some software developer to cause damage to the computer, programs and files in which it found itself. The computer virus may be designed to display unwanted messages.

A computer virus is a program that can replicate itself by changing other programs to include a copy of itself. A virus causes the infected computer system to function in ways not originally planned. The computer virus cannot be seen with your natural eyes yet the effects can be notified on an infected system.

 Types of computer virus

There are three ways in which a virus will infect your microcomputer.

• Boot sector virus

A boot sector virus infects hard drives and flash disks by making itself available on the boot sector of the disk. Booting up from an infected flash disk can cause damage to the hard drive.

• Executable file virus

They spread the infection by attacking the code to executable files (EXE.COM) in this way; the virus program will be executable before the host program is executed.

• Document Virus

A document virus can affect the document by moving from a disk partition table to a different sector and replacing it with its code, therefore infecting documents as they are accessed.

 EVALUATION:

1. Define Computer Virus

1. List and explain each type of computer virus

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively