Virus And Anti-Virus

1. VIRUS AND ANTI-VIRUS
University Of The Punjab Gujranwala Campus

3. Group Members
Sikander Hayat (BCS19-253)
M Umair Aslam (BCS19-234)
SUBMITTED TO:
Sir Abrar Khan

4. Table of Content
• Computer Virus
• What a computer virus can do?
• Who Create Computer Virus?
• History Of Computer Virus
• Types of Computer Virus
• Signs of viruses
• Why do people Create Computer virus?
• How do computer viruses spread?
• What is an Anti-Virus?
• How to protect system from viruses?
• How an Anti-Virus Works?

5. What is Computer Virus?
Computer Virus:
A computer virus is a type of malicious software that
attaches itself to other programs, self-replicates, and spreads to
other computers

6. What a computer virus can do?
 Stealing passwords or data
 Logging keystrokes
 Corrupting files
 Spamming your email contacts
 and even taking over your machine

7. Who Create a Virus?
Where do viruses come from? Every virus is created by an
author with a different motive—but all virus builders feel their
actions are justified. For some, a killer virus is the ultimate
technical challenge, like climbing a mountain. For others, creating
viruses is a form of self-expression. Some disgruntled employees,
consumers or citizens turn to virus building as revenge for perceived
injustices

8. History
The first computer virus, called "Creeper system", was an
experimental self-replicating virus released in 1971.
It was filling up the hard drive until a computer could not operate
any further.
This virus was created by BBN technologies in the US. The first
computer virus for MS-DOS was "Brain" and was released in 1986.

9. Types of Viruses
• Boot Sector Virus
• Program Virus
• Macro

10. Computer Viruses
Other Computer Viruses are:
• Worm
• Adware
• Trojan Horse
• Spyware
• Malware
• Spam
• Virus Hoaxes

11. Are you infected?
Signs of viruses:
 Your computer runs more slowly than normal
 Your computer stops responding or locks up often
 Your computer crashes and restarts every few minutes
 Your computer restarts on its own and then fails to run normally
 Applications on your computer don't work correctly.

12. Signs of viruses: Are you infected?
 You can't print correctly.
 You see unusual error messages.
 Disks or disk drives are inaccessible.

13. Why do people Create Computer virus?
Any programmer can make a virus to :
• To take money
• To prove ones skill or for revenge purpose
• To disable a computer or network

14. How do computer viruses spread?
 Removeable Drives or Media
 Internet
 CD/DVD disks
 E-mail Attachments

15. What is an Anti-Virus?
Antivirus software, also known as anti-malware, is a computer
program used to prevent, detect, and remove malware and other
malicious software’s like Worms ,Trojan etc. Antivirus software was
originally developed to detect and remove computer viruses, hence
the name.
Also Protect from further Virus
Attacks.
Like AVAST Anti-Virus, AVG etc.

16. How an Anti-Virus Works?
• Examine each file in a computer
• Examine its content with virus definition stored in its
virus dictionary
Virus Dictionary:
It is an inbuilt file belonging to an antivirus
software that contains code identified as a virus by the antivirus
authors.

17. How to protect system from viruses:
a) Install a good anti-virus software.
b) Update anti-virus regularly.
c) Use an Internet firewall .
d) Be Careful while downloading files or programs from internet.
e) Do Not use Pirated Software's.
f) Always scan your removeable drives before using them.

18. ANY QUESTION?