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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