CSE computer virus.pptx. Computer virus.

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Seminar
On
Computer Virus

Content
 Introduction
 What is Computer Virus
 Types of Infection
 Viruses
 E-mail viruses
 Worms
 Trojan horses
 Types of Computer Virus
 Difference between Virus and Worm
 Signs of a Computer Virus
 Preventions
 Top Seven Antiviral Program
 Conclusion
 Reference

Introduction
A virus is a program
designed by a computer
programmer (malicious
hacker) to do a certain
unwanted function.

What is computer virus?
 Computer virus refers to a program which
damages computer systems and/or destroys or
erases data files.

Types of Infection
 VIRUSES
 E-MAIL VIRUSES
 WORMS
 TROJAN HORSES

VIRUSES
A virus is a small piece of
software that piggybacks
on
real programs.
2 main characteristics of
viruses
 It must execute
itself.
 It must replicate itself.

E-MAIL VIRUSES
 Moves around in e-mail messages.
 Usually replicate itself by automatically
mailing itself to dozens of people in the
victim’s email address book.
 Example “MELISSA VIRUS”
 Example “I LOVE YOU VIRUS”

Melissa Virus (March 1999)
Melissa virus spread in Microsoft Word
documents sent via e-mail.
How it works ?
 Created the virus as word document
 Uploaded to an internet newsgroup
 Anyone who download the document and
opened it would trigger the virus.
 Send friendly email messages to first 50 people
in person’s address book.

Melissa Virus
 Melissa Virus was the fastest spreading virus
ever seen.
 Forced a number of large companies to shut
down their e-mail systems.

I Love You Virus (May,2000)
 Contained a piece of code as an attachment.
 Double Click on the attachment triggered the
code.
 Sent copies of itself to everyone in the victim’s
address book
 Started corrupting files on the victim’s
machine.

WORMS
 Small piece of software that
uses computer networks and
security holes to replicate
itself.
 Copy of the worm scans the
network for another machine
that has a specific security
hole.
 Copy itself to the new
machine using the security
hole and start replicating.
 Example “CODE RED”

TROJAN HORSES
 A simple computer
program
 It claim to be a game
 Erase your hard disk
 No way to replicate
itself.

Types of Computer Virus
 Time Bomb
 Logical Bomb
 Boot Sector Virus
 Macros Virus
 Script Virus

 Time Bomb
A time bomb is a virus program that performs
an activity on a particular date .
 Logical Bomb
A logical bomb is a destructive program that
performs an activity when a certain action has
occurred.

 Boot Sector Virus
A boot sector virus infects boot sector of
computers. During system boot, boot sector
virus is loaded into main memory and destroys
data stored in hard disk.

Types of Computer Virus…
 Macros Virus
A macro virus is associated with application
software like word and excel. When opening
the infected document, macro virus is loaded
into main memory and destroys the data stored
in hard disk.
 Script Virus
Commonly found script viruses are written
using the Visual Basic Scripting edition (VBS)
and the JavaScript programming languages.

Difference between Virus and
Worm
 The difference between a worm and a virus is
that a virus does not have a propagation vector.
i.e., it will only effect one host and does not
propagate to other hosts.
 Worms propagate and infect other computers.
Majority of threats are actually worms that
propagate to other hosts.

World-wide damage estimates
 Computer viruses cause a huge amount of
damage worldwide.
 Damages from just one virus (The I Love You Virus)
are estimated at $10 billion dollars. It is also
estimated that 45 million people worldwide were
affected.
 Costs come from restoring damaged systems,
replacing lost information, steps taken to
prevent attacks and steps taken to prepare to
recover from attacks.

Case
 Jason, a 16 year old honor student, wrote a
computer virus that causes 4 billion dollars of
damage and impacted countless home and
business computers. The authorities traced the
virus to him. Jason says that he is very sorry
and didn’t mean for it to get so out of hand. He
said he was just fooling around to see if he
could do it.

Signs of a Computer Virus
 Computer runs slower then usual
 Computer no longer boots up
 Screen sometimes flicker
 PC speaker beeps periodically
 System crashes for no reason
 Files/directories sometimes disappear
 Denial of Service (DoS)

Prevention
 Updates
 Anti-Viruses
 More secure
operating systems
e.g. UNIX

Top Seven Antiviral Program
 Kespersky Antivirus
 Data fellows E-Plot
 Mcafee Antivirus
 Symantec Norton Antivirus
 Bit Defender 2010
 Quick Heal Antivirus
 ESaSS ThunderBYTE

Conclusion
 Be aware of the new infections out there.
 Take precaution measures.
 Always backup your data.
 Keep up-to-date on new Anti virus software.
 Simply avoid programs from unknown
sources.

Reference
 www.google.com
 www.wikipedia.com
 www.studymafia.org

CSE computer virus.pptx. Computer virus.

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