Computer Viruses

Types of Viruses and its Prevention

1. Presented by: Aditi Ambekar Angela Mary Binoy Annies Minu SathiyaSeelan COMPUTER VIRUSES

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

3. Index 1. History 3 . Symptoms 4 . Types Of Infections 6 . Types Of Viruses 7.Conclusion 2.Concept

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…. Virus + DEATH

6. What is a Computer 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 Of Infections Viruses Worms Trojan Horses Malware

9. Types Of Computer Viruses Boot Sector Virus. Direct Action Virus. File Infector Virus. Macro Virus. Multipartite Virus. Polymorphic Virus. Resident Virus. 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. Direct Action 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. Resident Virus 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. DEXTER Infects computers running with Microsoft Windows. Discovered by IT security firm Seculert , in December 2012. Steals confidential data of the user. Affects POS i.e. Point of sales. Detected in online banking transaction space on 19 January 2014 in India.

22. REVETON

23. REVETON In 2012, a major ransom ware worm known as Reveton began to spread. A Reveton is a malware which attempts to extort money from a user. It claims that your computer has been used for unauthorized activities.

24. CRYPTOLOCKER

25. CRYPTOLOCKER Encrypting ransom ware appeared in 2013 with a worm known as "Crypto Locker”. It gets Distributed either as an attachment to a malicious e-mail or as a drive-by download. CryptoLocker demands a payment with either a MoneyPak card or Bitcoin to recover the key. CryptoLocker to be extremely difficult to repair.

26. THANK YOU!