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NAME:ADEGBOYEGA KUJORE
DEPT:ELECTRICAL/ELECTRONICS ENGINEERING.
COMPUTER VIRUS
The term, virus?, in computer technology, refers to a self replicating application that spreads
by making copies of itself by inserting into other programs, other executables or documents,
and when executed begins to perform harmful actions on the system. All computer viruses are
deliberately created, not always malicious and some of them may be simply annoying.
A computer virus is a malware program that, when executed, replicates by inserting copies of
itself (possibly modified) into other computer programs, data files, or the boot sector of the
hard drive; when this replication succeeds, the affected areas are then said to be "infected".
Viruses often perform some type of harmful activity on infected hosts, such as stealing hard
disk space or CPU time, accessing private information, corrupting data, displaying political or
humorous messages on the user's screen, spamming their contacts, or logging their
keystrokes. However, not all viruses carry a destructive payload or attempt to hide
themselves—the defining characteristic of viruses is that they are self-replicating computer
programs which install themselves without the user's consent
Virus attacks on computer are more harmful that shows up more damage to the computer. It is
important to analyze the actions that a virus performs in one’s system and also the activities that are
possible to occur over time. This helps in protecting your PC with needful security system to safeguard
the secure information.
Some of the warnings that a computer shows when infected are
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Computer performance slowed down.
Your computer gets restarted frequently on itself.
You get more prompt messages with unusual errors and collapse of operations.
Failure in application functionality to meet up to the mark.
Crushed data that are change in format and difficult to reopen.
Files and documents do not get opened at times with error or unknown file formats.
Types of Computer viruses
There are different types of computer virus that are present today that cause more harmful
disastrous effects on the system operations.
Boot Sector Virus
These types of virus impinge on the disk and the hard drive that holds small section referred as
the sectors. Mater Boot Record in the boot purposes the function of reading and loading the
operating System. Once the boot sector is virus attacked they become infected when your reboot
the system with the infected diskette it spreads through the hard drive. Anti-virus software is the
only source that can clear off the virus leaving the disk and hard drive clean from the infections.
Multipartite viruses
It’s a form of hybrid boot sector program virus that affects the programming files. While the
infected program is activated it hits the boot record. When the system is restarted it subsequently
passes on the infection to other local drive in your computer scattering on the virus to the other
programming files instantly.
Program Virus
The program virus is kept hidden in the files or documents, once they are activated or called they
start infecting the system by copying the virus to other files and replicating to the system.
Polymorphic Virus
The Polymorphic virus behaves like a chameleon that changes its virus signature frequently once
they get multiplied and ready to affect the next new-fangled file. It is also referred to as binary
pattern. It is hard to identify the infected file and also the bug causing program with the help of
an effective anti-virus software program.
Active X and Java Control
Some of the unblocked programs from internet access also perform the activity of damaging the
computer system at once. Users who are not aware of the utility procedures of the web browser
allows the invade of certain programs that infect the system activities and performance by
enabling and disabling various files with adverse actions, more error messages are prompted with
pop-ups and other such adverse actions include the restriction of functionalities of normal
programs.