This is about virus, its description and history of virus

1. Presentation
on
Viruses and malicious code
Presented By:
Sunil Kafle

2. Malicious Code
 Malicious code is code causing damage to a computer or
system.

3. Types of Malicious Code
 Viruses.
 Trojan Horse.
 Logic Bomb.
 Time Bomb.
 Trapdoor.
 Worm.
 Rabbit.

4. Viruses
 Attach itself to program and propagates copies of itself
to other programs.

5. Trojan Horse
 contain unexpected, additional functionality.

6. Logic Bomb
 triggers action when condition occur.

7. Time Bomb
 triggers action when specific time occur.

8. Trapdoor
 allows unauthorized access to functionality.

9. Worms
 propagates copies of itself through network.

10. Rabbit
 as a virus or worm replicates itself without limit to
exhaust resources.

11. History of Computer Virus
 The following is a history of some of the most famous
viruses and malware ever:

12. Self Reproducing Automata
 John Von Neumann came up with the theory about self-
replicating programs in 1949.

13. Concept
 Fred Cohen comes up with the term “computer virus”.

14. Brain
 This is a virus also known as the “Brain boot sector”,
that is compatible with IBM PC.

15. Core Wars
 It replicates itself every single time it was run in
computer.

16. Creepers
 It accessed through ARPANET and copied to a remote
host systems with TENEX operating system.

17. Animal
 non-malicious Trojan that is known to spread through
shared tapes.

18. ELK Cloner
 These programs started to spread through files and
folders that are transferred to other computers by floppy
disk.

19. Lehigh
 This virus was programmed to infect command.com
files from Yale University.

20. Cascade
 This virus is a self-encrypted file virus which was the
outcome of IBM’s own antivirus product.

21. Jerusalem Virus
 This was developed to destroy all files in an infected
computers on the thirteenth day that falls on a Friday.

22. Happy99
 This type of worm was developed to attach itself to
emails with a message Happy New Year

23. ILOVEYOU
 The is capable of deleting files in JPEGs, virus MP2, or
MP3 formats.

24. Koobface
 This virus was developed and created to target Facebook
and My Space.

25. Kenzero
 The is a virus that spreads online between sites through
browsing history.

26. Cryptolocker
 This is trojan horse encrypts the files infected machine
and demands a ransom to unlock the files.

27. Backoff
 Malware designed to compromise Point-of-Sale (POS)
systems to steal credit card data.

28. How Viruses attach ?
 The virus get attached in three ways which are described
as :
1. Appended Virus.
2. Virus that surrounds the program.
3. Integrated Viruses and Replacement

29. Appended Virus
 A virus attaches itself to a program.
 Whenever the program runs, the virus is
activated.

30. Virus that surrounds the program
 This kind of virus that runs the original program but has
control before and after its execution.

31. Integrated Viruses and
Replacement
 A virus might replace some of its target, integrating
itself into the original code of the target.

32. How to prevent from Virus ?
 Don't share Drive C: without a password and without
read-only restrictions.
 Use Anti-Virus.
 Delete e-mail file attachments.
 Have multiple backups of important files.
 More secure operating systems.

33. Any
Question
???

34. Thank You
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