Computer Viruses...................................................

INTRODUCTION TO
COMPUTER VIRUS
 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.

*A computer virus is a software program with a
ability to make copies of itself ,which attacks
itself to other applications or files.
What is Computer Virus ?

Types of computer Virus.
 There are three types of computer virus
Boot virus
Program virus
Micro virus

BOOT VIRUS:
Boot viruses infects the boot records of hard disk and
floppy disks. Generally these are considered more
dangerous than program viruses.

Program Virus
 These viruses infect program files, which have
extensions such as .COM,.EXE.,SYS.,DLL,.OVL, or .SCR.
program files are attractive targets for computer virus
because they are widely used and have relativity, simple
formats to which viruses can attach themselves.

Macro Viruses
 These viruses infects data files. For example, Microsoft word
document and template files are susceptible to macro virus
attacks they spread rapidly as infected documents are shared on
networks or downloaded from internet sites.

What a computer virus
do?
 A virus tries to take control of computer system it has infected
at the first opportunity availible.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.

Top 5 Sources of Computer
Virus Attack
The most potent and vulnerable threat of computer users is virus attacks.
Virus attacks hampers important work involved with data and documents.
It is imperative for every computer user to be aware about the software
and programs that can help 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 Attachments
Internet
Booting From CD

Best antivirus software.
 Norton antivirus.
 MacAfee virus scan
 Kaspersky antivirus

Norton antivirus
 Norton antivirus is a product of Symantec corporation.
Founded in 1982.
 Notion check the following program
• Boot record s
• Programs(at the time you used them)
• All local hard drives,
• Files download from internet,
• Usb(when in use)

MacAfee virus scan
MacAfee, Inc. is an antivirus software and computer security
company headquartered in Santa Clara, California. It markets
McAfee Virus Scan and related security products and services,
including the Intercept, and Found stone brands. ...

Kaspersky ANTIVIRUS
 Kaspersky is product of Kaspersky lab,
 A Russian computer security company,
• Co-founded by Natalya Kaspersky antivirus,
do the following things
• Invites virus scan by opening the Kaspersky antivirus
window.

Computer Viruses...................................................

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