Details about Virus

2.  What is Computer Virus?
 Types of Computer Virus
 What a Computer Virus do?
 Sources of Computer Virus attack
 Prevention from Computer Virus
 Best Antivirus Software

3. What is Computer Virus?
 A Computer Virus is a Software Program With a
ability to make Copies of it Self, which attacks itself
to the other application and files.
 One of the first detected virus was the Creeper
virus in the early 70’s.
 Before computer networks became widespread,
most viruses spread on removable media,
particularly floppy disk.

4. What a Computer Virus Do?
 A Virus tires to take control of Computer System it
has infected at the first opportunity available. It
makes copies of itself and also try to carry harmful
task written in its program. This process can happen
so quickly that the user is not even aware of the
presence of a virus in his/her Computer

5. Types of Computer Virus
 Boot Sector Virus
 Infects the boot and hard drives through the sharing of infected
disks and pirated software applications.
 Once your hard drive is infected all disks that you use in your
computer will be infected.
 Program Virus
 Becomes active when the program file (usually with extensions
.BIN, .COM, .EXE, .OVL, .DRV) carrying the virus is opened.
 It then makes copies of itself and will infect other programs on
the computer.
 Multipartite Virus
 Hybrid of a Boot Sector and Program viruses
 It infects program files and when the infected program is active it
will affect the boot record.

6. Boot Sector Virus
 A boot sector virus is a type of virus that infects the
boot sector of floppy disks or the Master Boot Record
(MBR) of hard disks (some infect the boot sector of
the hard disk instead of the MBR)
 Boot sector computer viruses are most commonly
spread using physical media.
 An infected floppy disk or USB drive connected to a
computer will transfer when the drive's VBR is read,
then modify or replace the existing boot code.

7. Program Virus
 A computer virus is a type of malicious software
program (Malware) that, when executed, replicates
by reproducing itself (copying its own source code)
or infecting other computer programs by modifying
them.
 Computer viruses usually spread in one of three
ways: from removable media; from downloads off
the Internet; and from e-mail attachments.

8. Multipartite Virus
 multipartite virus is a fast-moving virus that uses file
infectors or boot infectors to attack the boot sector
and executable files simultaneously.
 A multipartite virus is also known as a hybrid virus.
 A multipartite virus is spreads in multiple ways. The
term was coined to describe the first viruses that
included DOS executable files and PC BIOS boot
sector virus code, where both parts are viral
themselves.

9. Top 5 Sources of Computer Virus Attack
 Virus attacks hampers important work involved with
data and document. It is imperative for every computer
to protect the personal computers from attacks. One
must take every possible measure in order to keep the
computer systems free from Virus attacks. The top
sources of Virus attacks are highlighted below:
 Downloadable Programs
 Cracked Software
 Email attachment
 Internet
 Booting From CD

10. Prevention From Computer Virus
• Always use a virus scanner and keep it up to date with
latest updates.
• Enable auto-protect features of your virus scanner.
• Use a spyware scanner to scan and remove spyware and
update it regularly.
• Never download content from unknown web sites.
• Never open email attachments coming from unknown
sources.

11. Prevention From Computer Virus
 Use a personal firewall.
 Keep your operating system
updated with latest updates
and patches.
 Never click “yes” in unknown
popup ads that appear.
 Always close them using “x”
on the upper right hand corner.

12. Best Anti Virus Software
 Kaspersky Antivirus
 Avira Antivirus
 McAfee Secure
 AVG Antivirus
 Norton Antivirus
 Bit defender Secure

13. Norton Antivirus
 Norton Antivirus is a product of Symantec
Corporation founded in 1982.
 Norton Check the following programs
 Boot records
 Programs(at the time you use them)
 All local hard drives
 Files downloaded from internet
 USB(When in use)

14. McAfee Virus Scan
 McAfee.Inc is an antivirus software and computer
security Company headquartered in Santa Clara.
 It markets McAfee Virus Scan and related security
products and services.
 It including the Intercept and Found stone brands.

15. Kaspersky Antivirus
 Kaspersky is a product of Kaspersky lab.
 A Russian computer security company.
 Co-founded by Natalya Kaspersky antivirus, do the
following thing;
 Invites virus scan by opening the Kaspersky
antivirus window.

16. By: R.AnuRagavan  