Virus and Anti Virus - Types of Virus and Anti Virus

Computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation. A virus might corrupt or delete data on your computer, use your e-mail program to spread itself to other computers, or even erase everything on your hard disk.

1. Virus and Anti-Virus

2. BY: Adeel Rasheed Superior University

3. CONTENTS What is Virus? Types of Virus Types of Anti-Virus How does Anti-Virus Works Some Anti-Virus Software's which are available in market

4. What is Computer Virus? Computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation . A virus might corrupt or delete data on your computer, use your e-mail program to spread itself to other computers, or even erase everything on your hard disk.

5. Virus Infection of more than 75,000 computers in 10 minutes

6. Source of Viruses Funny images G reeting cards A udio and video files E-mail messages T hrough downloads on the Internet CD,DVD,USB, Memory c ards,etc

7. Types of Viruses Macro Viruses Memory Resident Viruses Overwrite Viruses Direct Action Viruses Directory Virus Web Scripting Virus Multipartite Virus FAT Viruses Companion Viruses Polymorphic Virus Email Virus

8. Macro Viruses: These viruses infect the files created using some applications or programs that contain macros such as doc, pps, xls and mdb. Memory Resident Viruses: They usually fix themselves inside the computer memory. They get activated every time the OS runs and end up infecting other opened files. They hide in RAM . Overwrite Viruses: These types of viruses delete any information in a file they infect, leaving them partially or completely useless once they are infected. Direct Action Viruses: These viruses mainly replicate or take action once they are executed. When a certain condition is met, the viruses will act by infecting the files in the directory or the folder specified in the AUTOEXEC.BAT. The viruses are generally found in the hard disk’s root directory, but they keep on changing location.

9. Directory Virus: Also known as cluster virus or file system virus. They infect the computer’s directory by changing the path indicating file location. They are usually located in the disk Web Scripting Virus: Most web pages include some complex codes in order to create an interactive and interesting content. Such a code is often exploited to cause certain undesirable actions . Multipartite Virus: These type of viruses spread in many different ways. Their actions vary depending on the OS installed and presence of certain files. They tend to hide in the computer’s memory FAT Viruses: These lardy viruses attack the file allocation table (FAT) which is the disc part used to store every information about the available space, location of files, unusable space etc.

10. Companion Viruses: These types of viruses infect files just like the direct action and the resident types. Once inside the computer Polymorphic Viruses: I n a different way every time they infect your computer. They use different encryption and algorithms. This makes it difficult for the antivirus software to locate them using signature or string searches Email Virus: This is a virus spread via an email. Such a virus will hide in an email and when the recipient opens the mail.

11. What is Anti-Virus software? C omputer programs intended to Identify and Eliminate Computer Viruses.

12. Antivirus software is a class of program that searches a hard drive and floppy disk for any known or potential viruses. Also search from remove able disk. Anti-virus is a software that scans files or your computer's memory for certain patterns that may indicate an infection.

13. Types of Scans Automatic scans: Depending what software you choose, you may be able to configure it to automatically scan specific files or directories and prompt you at set intervals to perform complete scans . Manual scans: It is also a good idea to manually scan files you receive from an outside source before opening them.

14. Main types of Anti-Virus There are different types of antivirus software for different computers Some are designed for personal computers . Some are for servers

15. How Antivirus software works? Interception Destination System Source System Alert Disinfection

16. Anti-virus applications maintain a database of known viruses and compare scanned files that match the characteristics of known viruses. If a scanned files matches those characteristics of known viruses. If a scanned file matches those characteristics, it is quarantined so that it cannot affect other files on your system . Once the file is quarantined, the application can attempt to repair it, delete it, or prompt you for a decision on what to do about the file infected

17. B est Antivirus software available in market

18. Bit defender Antivirus This years best defense against computer viruses, spyware, hackers and spam is an antivirus program called Bit Defender. Has a user-friendly interface that scans all existing files on your computer, all incoming and outgoing emails, and even IM transfers. Features include privacy protection and web scanning for internet use. a years subscription is about $ 29.95

19. NAV The most widely used software is the Norton Antivirus. (NAV) Since its release in 1990, over 100 million people around the world have used it. It’s a free program but in order to receive live updates, a valid subscription is needed. A yearly subscription is only $49.99

20. McAfee McAfee Virus Scan is another popular antivirus program. It’s designed for home and home-office use. It’s used specifically on a Microsoft Windows platform. The includes a number of features including on access file sharing, inbound and outbound firewall protection. A yearly subscription is only $59.99

21. Kaspersky For the average home user and advanced users the Kaspersky antivirus software has an easy to use interface. The program uses 3 tabs for protection, settings and support. It updates itself on an hourly basis and is one of the fastest antivirus programs available. However, quality comes at a price and year subscription is $59.99 .

22. Avast The boot-time scanner, Network Shield, and e-mail scanner in Avast has attracted end-users. The detection capability of Alwil Avast! is very good and you can install the program in any edition of Windows. The installer of Avast is bundled with Google Chrome browser that is not necessary to continue using the antivirus program . A yearly subscription is only $34.99

23. Thanks Q A