2. VIRUS stands for ”Vital Information Resource Under Siege ”.
A computer virus is a computer program that can replicate
itself and spread from one computer to another. A computer
program loaded to your computer with-out your knowledge or
permission and runs against your wishes. All computer viruses
are manmade.
Even such a simple virus is dangerous because it will use all
the available memory and bring the system to the holt.
The virus stays active in the background and infect new
hosts those files are accessed by other program or the
operating system itself.
3. The computer runs slower than usual.
The computer crashes, and then it restarts every
few minutes.
Applications on the computer do not work correctly.
Disks or disk drives are inaccessible.
You see unusual error messages.
An antivirus program cannot be installed on the
computer, or the antivirus program will not run.
New icons appear on the desktop that you did not
put
Increases the use of disk space and growth in file
size as virus gets attached itself to many files.
4. Viruses can be divided into two types based on their behavior
when they are executed.
Resident
Nonresident
Resident Virus:- Resident viruses do not search for
hosts when they are started. Instead, a resident
virus loads itself into memory on execution and
transfers control to the host program.
Non-Resident Virus:- Nonresident viruses
immediately search for other hosts that can be
infected, infect those targets, and finally transfer
control to the application program they infected.
6. Trojan Horses are actually normal computer program.
This is different from a regular virus because it does
not attempt to reproduce itself. Trojan Horses do not
affect a great number of people because they are
discover quickly.
7. It has been made copy itself from one computer
to another over network. It is very harmful
virus because it has reproduce nature.
Marco virus spread much more than other
type of viruses as people frequently share
data files, it spread round the word in two
hours effecting tens of millions of
computer
8. A block of code which attaches itself to
another program and it can copy itself in to
subsequent applications that you run.
9. On downloading files from the Internet.
On opening an e-mail attachment.
On copying programs or files from any other
infected computer.
10.
11.
12. Most viruses have two phases to their existence,
the “infection phase” and the “attack phase”.
All viruses have an infection phase, but not all
have an attack phase.
During the infection phase, the virus spreads
itself.
13. "Your friend gives you a game on a disk. The
game has an infected file that you don't know
about. Each time you play the game, the virus
copies itself into another program without you
knowing. Now, whenever either of the programs
are executed, the virus is copied. This continues
as the virus infects the rest of the computer. If
any of the files are transferred to a floppy disk
or e-mail attachment, and they are put on
another computer, the process starts again"
14. The attack phase is set off by a trigger,
such as a time or date. The attack phase is
when the virus causes damage or other
unwanted system behavior. In order to make
sure it has spread, viruses often delay the
attack phase, sometimes for years.
15. Here are some tips that can help prevent a
computer virus from attacking your system.
Your first line of defense is to install anti-virus
software. . This software can scan all your drives
for viruses and neutralize them.
Install updated and good quality Anti-Virus
software that provides complete protection from
spyware, adware and malware too.
Schedule a complete system scan at least once
a week to keep your system clean.
Schedule a complete system scan at least once
a week to keep your system clean
16.
17. Kasper Sky Anti Virus
Bit Defender Anti Virus
Trend Micro
Norton Anti Virus Internet Security
McAfee Antivirus
Panda Anti Virus Pro 2009
Zone Alarm Anti Virus
F-Secure Anti Virus
AVG Anti Virus
ESET NOD32 Anti Virus
