JSS 3 ICT NOTE 3rd Term
THIRD TERM SCHEME OF WORK
Week 1 : Computer virus (meaning, types of computer virus, example of computer virus).
Week 2 : Source of computer virus.
Week 3 : Virus warning signs.
Week 4 : Virus detection (Anti - virus).
Week: 5 - 6 ; Revision
Week: 7-12 revision and examination.
WEEK 1.
COMPUTER VIRUS
A computer virus is a malicious code designed to spread from
host to host by itself without the user’s knowledge to perform malicious
actions. It imposes harm to a computer by corrupting system files, destroying
data or otherwise by being a nuisance. They are programs originally invented by
for piracy protection.
How does a Computer Virus Spread
A computer
virus spreads through
removable media, internet downloads, and e-mail attachments. In other words, a
virus spreads while the user is viewing an infected advertisement, visiting an
infected website, opening the attachment in the email, or clicking on an
executable file. Besides that, connecting with an already infected removable
storage device such as a USB drive also spreads the infection.
There are two ways by which a virus operates; the first type
starts replicating itself as soon as it lands on the computer; the second type
remains dormant until it is triggered.
Types of Computer Virus
§ 1. Boot Sector Virus
§ 2. Direct Action Virus
§ 3. Resident Virus
§ 4. Multipartite Virus
§ 5. Polymorphic Virus
§ 6. Overwrite Virus
§ 7. Spacefiller Virus
§ 8. File Infector Virus
Boot Sector Virus –
The Boot Sector virus infects the master boot record, and it mostly spreads through the removable media. It is a complex task to remove this virus and often requires the system to be formatted.
The Boot Sector virus infects the master boot record, and it mostly spreads through the removable media. It is a complex task to remove this virus and often requires the system to be formatted.
Direct Action Virus
–
The Direct-Action Virus remains dormant on a computer until the file containing the virus is executed.
The Direct-Action Virus remains dormant on a computer until the file containing the virus is executed.
Resident Virus –
The Resident Virus inserts itself in a computer system’s memory. It is hard to identify the virus, and it is equally tough to remove it.
The Resident Virus inserts itself in a computer system’s memory. It is hard to identify the virus, and it is equally tough to remove it.
Multipartite Virus
–
The Multipartite Virus infects and spreads in multiple ways. This virus infects both the program files and the system sectors.
The Multipartite Virus infects and spreads in multiple ways. This virus infects both the program files and the system sectors.
Polymorphic Virus –
A Polymorphic Virus is more capable of altering its signature pattern whenever it replicates thereby rendering it hard to be detected.
A Polymorphic Virus is more capable of altering its signature pattern whenever it replicates thereby rendering it hard to be detected.
Overwrite Virus –
As the name suggests, an Overwrite Virus spreads through emails and deletes all the files it infects.
As the name suggests, an Overwrite Virus spreads through emails and deletes all the files it infects.
Spacefiller Virus –
The Spacefiller Virus is also known as Cavity Virus; it occupies the empty spaces between the codes. It does not harm the files.
The Spacefiller Virus is also known as Cavity Virus; it occupies the empty spaces between the codes. It does not harm the files.
File Infector Virus
–
A File Infector Virus is also known as Parasitic Virus because it comes attached to program files, such as .COM or .EXE files.
A File Infector Virus is also known as Parasitic Virus because it comes attached to program files, such as .COM or .EXE files.
Assignment:
Mention 2 sources of computer Virus.
WEEK 2
SOURCES COMPUTER VIRUS
Sources of Computer Virus include;
1. Downloading
Programs.
Programs that contains the
downloadable files are the commonest source of malware such as freeware, worms,
and other executable files. ...
2. Pirated or
Cracked Software.
3. Email Attachments. ...
4. Internet.
5. Booting Data from Unknown CDs. ...
6. Bluetooth. ...
7. Unpatched Software.
8. Infected disk of flash drive.
EXAMPLES OF COMPUTER VIRUS
1. Worms
2. Trojan
horse
3. Adware
4. Back doors
5. Spyware
6. Zombie
7. Honey pot
8. Ralia
odinga
Assignment:
Mention 2 virus signs.
WEEK 3
VIRUS WARNING SIGN
The list of computer virus symptoms include:
1. 1. A slow performing computer
2. 2. Pop-ups automatically
showing up on the screen
3. 3. Programs running on
their own
4. 4. Automatic
multiplying/duplicating files
5. 5. Presence of unknown
files and applications on the computer
6. 5. Files getting deleted
or corrupted.
7. 6. Everything seems not
to b working with your PC.
When a user comes across any of these symptoms, then there are
chances that the computer is virus infected.
ASSIGNMNT
Mention 3 Anti-virus
WEEK 4
VIRUS DETECTION (ANTIVIRUS)
An anti virus is also a program written by the
programmer to wipe away all the viruses on the computer systems.
Examples of antivirus include:
- Norton
antivirus
- MCAFEE
virus scan
- Doctor
Solomon took kit
- Penicillin
- Avast
- Avira
- AVG
- Kaspersky
- Comoro
anti virus
1 10. Panda security etc
There are two approaches to erase computer infection. The first
approach is do-it-yourself and the second approach is to ask for some help to
get rid of the virus.
The antivirus is
designed to protect computers from sophisticated threats too. Here’s a list of
things that a user needs to do:
Step 1- Disconnect your computer from the internet
Step 2- Enter Safe Mode – this helps running only the required programs and applications.
Step 3- Delete all temporary files to free up the disk space
Step 4- Run a virus scan
Step 1- Disconnect your computer from the internet
Step 2- Enter Safe Mode – this helps running only the required programs and applications.
Step 3- Delete all temporary files to free up the disk space
Step 4- Run a virus scan
VIRUS PROTECTION
1.
Install anti –virus software
on the computer system.
2.
Avoid the use of
unauthorized software.
3.
Update your
anti-virus software regularly
4.
Make sure that the computer
is always clean and free from dust
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