This document discusses viruses and virus writing. It provides an introduction to viruses, including what they are, how they spread, and common types. It also discusses virus protection best practices like avoiding unexpected files, enabling macros only when needed, and being wary of certain file extensions. The document then gives a simple example of writing a basic virus using batch programming. Overall, the document aims to provide foundational information about viruses as well as demonstrate how to write a basic virus.

1. Dr. Bababsaheb Ambedkar
Technological University, Lonere.
Name : Ganeshdev S. Chavhan
Roll No : 20140608
Year: Second Year Computer
Engineering
Topic : Virus ( Introduction and
Writing Basics )
Department of Computer Engine
Guide
Mr. Laxman Netak
(Associate Professor)

3. Virus basics
What to be concerned about
Office protection
Anti-virus Warnings
Virus Writing
How to write a simple virus ?

4.  A virus is a program that self-
replicates
 It is not data
 You can only catch a virus by running a
program

5.  Virus
 Self-replicating
 Also called a worm
 Trojan Horse
 A program which appears to be valuable
but has an unexpected consequence

6.  The four most common virus infections come from:
File – A virus type that infects existing files on the computer
(~40%)
Macro – A virus that runs as a macro in a host application such
as the MS Office applications (~35%)
VBScript – A virus that uses Windows Visual Basic Script
functionality (~10%)
Internet Worm – A virus that is primarily characterized
by it’s replication across the Internet (~5%)

7. The average cost of a virus disaster is between
$50,000 to $500,000
Average server downtime for a virus
is 14 hours

8.  Don’t open files that you are not expecting
 Many viruses automatically send files without the e-mail
account owner’s knowledge.
 Ask the sender to confirm unexpected files.
 Suspect messages that appear more than once in your Inbox
 You may receive the same e-mail from a virus repeatedly.
 Learn file extensions
 Your computer will display both an icon and a file extension
for files you receive. Open only file extensions you know
are safe.

9.  The following file types should never be
opened:
 .EXE
 .PIF
 .BAT
 .VBS
 .COM

10.  Office files are mostly data with some program code
 Office macros are programs, which can be viruses
 Office will prompt you to enable macros
 Enable macros only when you know why office is asking

11. Virus has been Detected !
 Clean
 Quarantine
 Shred
 Block
 Repair

12. Virus Writing
Virus writer are of two types
 Script Kiddy
 Programmers
 He should know following
 Bat programing
 Visual Basic
 OR PHP

13. @echo off
:hell
md file_name%random%
goto hell
Write code in text editor
Save it as a .bat extension
Double click on the created Devil(not actually)
See the magic !

14. http://techrepublic.com.com
http://mirror.aarnet.edu.au/pub/code-red/newframes-small-
log.gif
http://www.factmonster.com/ipka/A0872842.html
http://www.faqs.org/faqs/computer-virus/new-users
http://www.mines.edu/academic/computer/viri-sysadmin.htm