Computer Viruses

Presented by:

Aditi AmbekarAngela Mary BinoyAnnies Minu SathiyaSeelan

COMPUTERVIRUSES

SICK OF COMPUTER VIRUSES?

What they are…Where they come from…Why they are here…

Index1. History1. History

3. Symptoms3. Symptoms

4. Types Of Infections4. Types Of Infections

6. Types Of Viruses6. Types Of Viruses

7.Conclusion7.Conclusion

2.Concept2.Concept

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.

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

Virus + DEATH

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...

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.

Types Of Infections

Viruses

Worms

TrojanHorses

Malware

Types Of Computer Viruses1. 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.

Boot Sector Virus

It places its own codesand commands into MBR.

Browser HijackerAlters the search and error page of a browser and redirectsthe user to its own page.

Direct Action Virus

•They load with the host program into computer’s memory.

•They can be crafted with relative ease.

File Infector Virus

A file infector is a virus that infects an executable file.

Typically affects only one type of file.

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.

Multipartite Virus

• May attack in more than one methods.

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.

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.

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

LATEST VIRUSES

DEXTER

DEXTERInfects 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.

REVETON

REVETONIn 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.

CRYPTOLOCKER

CRYPTOLOCKEREncrypting 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.

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