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1. ACADEMIC COMPUTING
FACULTY OF SCIENCE
COMPUTER
DEPARTMENT
FIRST STAGE
FIRST SEMESTER
2022-2023
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Didar Dlshad
didar.dlshad@soran.edu.iq

2. Contents:
 What’s computer security
 What’s computer Viruses?
 History of computer viruses:
 Virus Languages
 Virus Types
 Symptoms of Virus Attack
 Prevention from Computer Viruses
 What’s antivirus
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3. 1/5/2023 3
What’s computer virus?
Why do people create computer viruses?

4. 1/5/2023 4
What’s computer security?
Computer Security is the protection of computing systems and the data that they
store or access.
Computer security, also known as cyber security or IT security, is the protection
of computer systems from the theft or damage to their hardware, software or
information.

5. What’s computer viruses?
A computer virus is piece of code or a program that runs against
your wishes and is loaded onto your computer without your
knowledge.
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6. 1/5/2023 6
History of computer viruses:
The first computer virus was called “Creeper.” It was invented in 1971
written by Bob Thomas at BBN Technologies . The first known computer
virus was written in 1982 by a man named Rich Skrenta. This virus was
termed Elk Cloner, and was the first computer virus to appear outside the
computer where it was created in.

7. Difference between biological virus and computer virus
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8. Virus Languages
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 ANSI COBOL(Common Business-Oriented Language)
 C/C++
 Pascal
 VBA (Visual Basic for Applications)
 Unix Shell Scripts
 JavaScript

9.  Time Bomb Virus: is a virus program that works in particular
date to do special activity.
 Logical Bomb Virus: its destructive program that do an activity
when a certain action has occurred.
 Boot Sector Virus: its infects the boot sector, the virus is loaded
in to the main memory during system boots and destroyed the
data stored in the hard.
Types of computer viruses
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10.  Macros Virus: Its infects files that are created using certain
applications or programs that contain macros, like word, excel,
and power point.
• When opening the infected document the virus loaded in to
the main memory and destroyed the data stored in the
hard.
• These hide in documents that are shared via e-mail or
networks.
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Types of computer viruses

11.  Script Virus: programming languages that let the user create
new features and utilities it can be written by using java script or
VBS (Visual Basic Script) programs languages.
• The main sources of web scripting viruses are the web
browsers or infected web pages.
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Types of computer viruses

12.  Worm Virus: Its a kind of malicious code. It is blocking out
the system so that its operations are slowed down or
stopped.
• Its self replicating information so fast that the entire
network may collapse.
• They do not infect files or damage them.
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Types of computer viruses

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Polymorphic virus
A virus that can encrypt its code in different ways so that it
appears differently in each infection. These viruses are more
difficult to detect.
Types of computer viruses

14.  Trojan Horse: Its a kind of malicious code. it is usually
disguises itself as a useful program or application if executed
the computer will be damaged.
• Do not reproduce by infecting other files.
• Its not self-replicate like worms.
• Its destructive program .
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Types of computer viruses

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How do computer viruses spread?
• Email and text message attachments
• Internet file downloads
• Social media links
• Mobile devices and smart phones can become infected with mobile viruses
through shady App downloads.
• As attachments of socially shareable content such as funny images, greeting
cards, or audio and video files.
• Inserting or connecting an infected disk, disc, or drive
• Visiting unknown links

16. • Computer do not boots up.
• Files/directories sometimes disappear.
• The Command CTRL+ALT+DEL No Longer Works.
• System crashes for no reason.
• Program takes longer to load.
• The program size keeps changing.
• User created files have strange names.
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How will you know you have computer viruses

17. How will you know you have computer viruses
 Your computer runs unusually slow or freezes.
 People are receiving emails from you which you didn’t send.
 You get pop up messages and advertisements.
 Slower than usual network or internet speed.
 Files mysteriously appear or disappear from your computer.
 Your hard drive free space keeping shrinking.
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18. Prevention from Computer Viruses
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 Install the anti-virus program and keep it up to date.
 Use your browser's privacy settings.
 Use a pop-up blocker with your browser.
 Do not open email messages from unfamiliar senders, of
email attachments that you do not recognize.

19. Prevention from Computer Viruses (Cont.)
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 Do not run any download programs from the internet without
scan it.
 Back Up your programs and files periodically.
 Use the firewall programs.

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Antivirus or Antimalware: Is a software that operates on
different OS which is used to prevent from malicious
software.
Firewall: It is a software or hardware which is used to filter
network traffic based on rules.

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1. Bitdefender Antivirus Plus
2. Kaspersky Anti-Virus
3. McAfee AntiVirus Plus
4. Norton Security
5. Avast Pro Antivirus
6. AVG Anti-Virus
7. Vipre Antivirus
8. ESET Antivirus
9. Panda Antivirus
10. F-Secure Anti-Virus
Some Examples of Antiviruses