College of Management & Computer Science,Yavatmal.

2010-2011

Presented by :Mohit Prakash Jaiswal

Computer Viruses & Antiviruses

Seminar On

Guided by :Nilesh Bhoyar Sir

MCM Final Year

Content :INTRODUCTION TYPES OF VIRUSES VIRUSES: WHAT THEY INFECT ANTI-VIRUS SOFTWARE SAFE COMPUTING PRACTICES(SAFEHEX) APPROACHES ANTI- VIRUS RESEARCH CONCLUSION REFERENCE

INTRODUCTION Computer viruses are called viruses because they share some of the traits of biological viruses. A computer virus passes from computer to computer like a biological virus passes from person to person.   The person might have a computer virus infection when the computer starts acting differently. For instance getting slow or when they turn the computer on, it says that all the data is erased or when they start writing a document, it looks different, some chapters might be missing or something else abnormal has happened.  

TYPES OF VIRUSES1. E-MAIL VIRUSES :Moves around in e-mail messages.

2. WORMS: Computer program that copies itself from machine to machine.

3. TROJAN HORSES: Claims to do one thing, but does something else.

4. BOOT VIRUS : Infect floppy disk boot records or master boot records.

1.E-MAIL VIRUSES :

An e-mail virus moves around in e-mail messages, and usually replicates itself by automatically mailing itself to dozens of people in the victim's e-mail address book.

Example : Melissa Virus(March 1999)

Open the Options dialog from the Tools menu in Microsoft Word and make sure that Macro Virus Protection is enabled. Newer versions of Word allow you to customize the

level of macro protection you use.

2. WORMS :

A worm is a computer program that has the ability to copy itself from machine to machine. Worms normally move around and infect other machines through computer networks. Using a network, a worm can expand from a single copy incredibly quickly.

3. TROJAN HORSES:

A Trojan horse is simply a computer program. The program claims to do one thing (it may claim to be a game) but instead does damage when you run it (it may erase your hard disk). Trojan horses have no way to replicate automatically.

4. BOOT VIRUS :

These viruses infect floppy disk boot records or master boot records in hard disks. They replace the boot record program (which is responsible for loading the operating system in memory) copying it elsewhere on the disk or overwriting it. Boot viruses load into memory if the computer tries to read the disk while it is booting.

VIRUSES: WHAT THEY INFECT1. System Sector Viruses 2. Macro Viruses3. Companion Viruses4. Cluster Viruses5. Batch File Viruses6. Source Code Viruses

ANTI-VIRUS SOFTWARE

PROTECTION FROM VIRUSES •Scanning•Integrity checking •Interception•Anti-virus product use guidelines•Watch out for dangerous file extensions

SAFE COMPUTING PRACTICES(SAFEHEX)

•Update AV software •Don't use illegal software•Establish password management procedures •Don't open attachments •Get info •TAKE BACKUPS!!!

APPROACHES TO DETECT VIRUSES 1. THE SIGNATURE APPROACH

APPROACHES TO DETECT VIRUSES 2.THE SANDBOX APPROACH

APPROACHES TO DETECT VIRUSES 3.THE HEURISTIC APPROACH

REMOVING AN INFECTED FILE

ANTI- VIRUS RESEARCH

IBM has been preparing a defense against fast spreading viruses

Built the first commercial-grade immune system

Can find, analyze and cure previously unknown viruses

End-to-end security of the system allows the safe

submission of virus samples and ensures

authentication of new virus definitions.IBM VIRUS ANALYSIS CENTER

There are lots of viruses in the world and new viruses are coming up every day. There are new anti-virus programs and techniques developed too. It is good to be aware of viruses and other malware and it is cheaper to protect you environment from them rather then being sorry. Take Steps to prevent infection and in case of infection proper and safe ways of dealing with the infection.

CONCLUSION :

Reference :1. summers_wayne@colstate.edu2. Kaspersky Lab. Companion viruses.Glossary.3. ”Why people write computer viruses”,BBC news,date.4. “A+PC Technician’s”- Pocket Reference.

THANK YOU!!!!

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