Detail about various type of virus

2. SICK OF COMPUTER VIRUSES?
What they are…
Where they come from…
Why they are here…

3. INDEX
History
Concept
Symptoms
Types Of Infections
Types Of Viruses
Conclusion

4. HISTORY
 The first computer virus was called
“Creeper.”It was invented in the
early 1970’s.Since then, millions of
viruses have been invented.
 The first known computer virus
was written in 1981 by a man
named Rich Skrenta . This virus
was termed Elk Cloner, and was
the first computer virus to appear
outside the computer where it was
created in.

5. Everyone who owes a computer might heard a lot
about computer viruses….

6. WHAT ISACOMPUTER VIRUS?
• A Computer Virus is a
program that can copy itself
and infect a computer without
the permission or knowledge
of the user.
• A Computer Virus has 2 major
characteristics: the ability to
replicate itself, and the ability
to attach itself to another
computer file...

7. SYMPTOMS
The following are a few Symptoms
that your computer might have a
virus:
• Slow response and slow program
execution.
• Random hard drive crashes and
restarts.
• Distorted graphics and text.
• Files that have mysteriously
vanished.
• Extensive pop-up ads.
• Inability to open files with existing
passwords.

8. TYPES OFINFECTIONS
Viruses
Malware
Worms
Trojan-
Horses

9. TYPES OF COMPUTER VIRUSES
1. Boot Sector Virus.
2. Direct Action Virus.
3. File Infector Virus.
4. Macro Virus.
5. Multipartite Virus.
6. Polymorphic Virus.
7. Resident Virus.
8. Web Scripting Virus.

10. BOOT SECTOR VIRUS
It places its own codes
and commands into
MBR.

11. BROWSER HIJACKER
Alters the search and
error page of a
browser and redirects
the user to its own page.

12. DIRECTACTION VIRUS
•They load with the host
program into computer’s
memory.
•They can be crafted with
relative ease.

13. FILE INFECTOR VIRUS
•A file infector is a virus that
infects an executable file.
•Typically affects only one type
of file.

14. MACRO VIRUS
•These type of virus infects
word , excel, PowerPoint, access
and other data files. Once
infected repairing of these files
is very much difficult.

15. MULTIPARTITE VIRUS
May attack in more than one
methods.

16. POLYMORPHIC VIRUS
A virus that can encrypt its code
in different ways so that it
appears differently in each
infection. These viruses are
more difficult to detect.

17. RESIDENTVIRUS
• Hides within the computers memory.
• It activates whenever the OS loads or
operates.
• This virus may be pernicious.
• It is of 2 types:
Fast Infector.
Slow Infector.
• Removal of this virus is bit tricky.
• It may be designed to block the
actions of Anti Virus programs.

18. WEB SCRIPTING VIRUS
There are few website that execute
complex code with the purpose to provide
interesting content ,these codes often get
exploited and due to this a virus becomes
able to infect a machine and to take
actions on a machine via website. This
particular virus is called web scripting
virus

19. LATEST VIRUSES

20. DEXTER

21. REVETON

22. CRYPTOLOCKER

23. Thank You