COMPUTER *VIRUS *                  Compiled By:                      Sanmitha Rao                       B.Sc 4th sem  Karn...
CONTENTS   Introduction   Origin of Viruses   Symptoms of virus attack   General Virus Types   Prevention is the best...
What is a virus?   Virus is a Computer program like any other    Program   It gives Instructions to your computer to do ...
*ORIGIN *   People normally create viruses by writing a    code .   Generally people create viruses just for thrill    o...
Symptoms of Virus attack   Computer runs slower than usual   Computer no longer boots up   Screen sometimes flicker   ...
TYPES OF VIRUSES1.   Boot Sector Virus2.   Macro Virus3.   Multipartite Virus4.   Polymorphic Virus5.   E-mail Viruses6.  ...
   Traditional Virus   Infect the boot on floppy disks and hard disks.   By putting its code in the boot sector virus c...
   Written using a simplified programming language    these viruses can effect your Microsoft applications    like word a...
   This can infect both your files and boot sector   It can infect thousands of times to your system    before it is cau...
   Changes code whenever it passes to    another machine.               Karnatak Science College Dharwad   10
   It moves around in the email messages.   Usually replicates itself by automatically    mailing itself to the dozens o...
   It has the ability to copy itself from    machine to machine.   Eat up storage space and slows down    the computer....
   It is basically a computer program that    claims to do one thing, but instead it    damages the computer.   It can c...
PREVENTION IS THE BEST        CURE1.   Install a virus protection software.2.   Run a secure operating system like Unix or...
Working of Antivirus Software   There are two ways in which a antivirus    software works-scanning software kooks    for ...
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Sanmi's first pp

  1. 1. COMPUTER *VIRUS * Compiled By: Sanmitha Rao B.Sc 4th sem Karnatak Science College Dharwad 1
  2. 2. CONTENTS Introduction Origin of Viruses Symptoms of virus attack General Virus Types Prevention is the best cure Working of antivirus software Practice safe Computing Karnatak Science College Dharwad 2
  3. 3. What is a virus? Virus is a Computer program like any other Program It gives Instructions to your computer to do the things which you don’t want it to do. It spreads. It can be destructive. It could format your hard drive boot sector or delete your files and render your machine inoperable. Karnatak Science College Dharwad 3
  4. 4. *ORIGIN * People normally create viruses by writing a code . Generally people create viruses just for thrill or fun. In early days viruses were pieces of code attached to a program. There are estimated 30,000 viruses, over 300 viruses are created each month. First virus was created to show loopholes in software. Karnatak Science College Dharwad 4
  5. 5. Symptoms of Virus attack Computer runs slower than usual Computer no longer boots up Screen sometimes flicker PC speaker beeps periodically System crashes for no reason Files /directories sometimes disappear Denial of Service (Dos) Karnatak Science College Dharwad 5
  6. 6. TYPES OF VIRUSES1. Boot Sector Virus2. Macro Virus3. Multipartite Virus4. Polymorphic Virus5. E-mail Viruses6. Worms7. Trojan horses etc. Karnatak Science College Dharwad 6
  7. 7.  Traditional Virus Infect the boot on floppy disks and hard disks. By putting its code in the boot sector virus can guarantee it gets executed. Load itself into the memory and it is able to run whenever the computer is on. Karnatak Science College Dharwad 7
  8. 8.  Written using a simplified programming language these viruses can effect your Microsoft applications like word and excel A document infected with the Macro Virus generally modifies a pre-existing commonly used command (such as save) to trigger its payload upon execution of that command. Karnatak Science College Dharwad 8
  9. 9.  This can infect both your files and boot sector It can infect thousands of times to your system before it is caught. It is a dangerous virus. Karnatak Science College Dharwad 9
  10. 10.  Changes code whenever it passes to another machine. Karnatak Science College Dharwad 10
  11. 11.  It moves around in the email messages. Usually replicates itself by automatically mailing itself to the dozens of people in the victims e-mail address book. Karnatak Science College Dharwad 11
  12. 12.  It has the ability to copy itself from machine to machine. Eat up storage space and slows down the computer. Normally move around and infect other machine through computer networks. But worms don’t alter or delete files. Karnatak Science College Dharwad 12
  13. 13.  It is basically a computer program that claims to do one thing, but instead it damages the computer. It can capture information from your system such as user name and password or could allow a malicious hacker to remotely control your system. It has no way to replicate automatically. Karnatak Science College Dharwad 13
  14. 14. PREVENTION IS THE BEST CURE1. Install a virus protection software.2. Run a secure operating system like Unix or NT.3. Avoid programs from unknown sources.4. Disable floppy disk booting.5. Macro virus protection is enabled in all Microsoft applications.6. Never double click on the attachment that comes as an executable that arrives as an email attachment. Karnatak Science College Dharwad 14
  15. 15. Working of Antivirus Software There are two ways in which a antivirus software works-scanning software kooks for a virus,scanning software looks for a unusual virus. For a known virus software will look for a virus signature and will zap it from the system. For an unknown virus the software quarantines the questionable program and will inform you about what the program may be trying to do. Karnatak Science College Dharwad 15

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