The document discusses computer viruses and malware. It defines viruses, worms, Trojans, spyware and adware as examples of malware. It describes how viruses, worms and Trojans work, what they can do and who might create them. It lists symptoms of virus infection and provides guidance for virus-free computing such as scanning disks from external sources and using antivirus software.

1. Computer
Viruses

2. MALWARES
 A software designed to
infiltrate or damage a
computer system
without the owner's
informed consent.
 A fusion of two words:
MALICIOUS and
SOFTWARE

3. Examples of MALWARES
 Computer viruses
 Worms
 Trojan horses
 Spyware
 Dishonest adware

4. WHAT IS A COMPUTER VIRUS?
Computer Virus is a
computer program,
designed as a prank or
a sabotage, that
replicates itself by
attaching to other
programs and carrying
out unwanted and
sometimes damaging
operations.

5. Some NOTES on VIRUSES…
 Viruses are computer programs
 A virus can only spread from one
computer to another when its host is
taken to the uninfected computer, for
instance by a user sending it over a
network or the Internet, or by
carrying it on a removable medium
such as a floppy disk, CD, or USB
drive.

6. Some NOTES on VIRUSES…
Viruses are sometimes
confused with computer
worms and Trojan horses.
The terms virus is
sometimes used to refer to
other types of Malwares.

7. WHAT IS A WORM?
 a self-replicating
computer program.
 it uses a network to
send copies of itself to
other nodes (computer
terminals on the
network) and it may do
so without any user
intervention.
 Unlike a virus, it does
not need to attach itself
to an existing program.

8. WHAT IS A TROJAN HORSE?
 any program that invites
the user to run it, but
conceals a harmful or
malicious payload.
 The payload may take
effect immediately and
can lead to many
undesirable effects
 they are often referred to
as “time bomb” programs

9. WHAT IS A SPYWARE?
 a computer software that is
installed secretly on a personal
computer to intercept or take
partial control over the user's
interaction with the computer,
without the user's informed
consent.
 can collect various types of personal
information; can also interfere with
user control of the computer in
other ways, such as installing
additional software, accessing
websites blindly that will cause
more harmful viruses,

10. WHAT IS A ADWARE?
 advertising-supported
software
 any software package
which automatically
plays, displays, or
downloads advertising
material to a computer
 Some types of adware
are also spyware and
can be classified as
privacy-invasive
software.

11. (Just some of the) HARM
COMPUTER
VIRUSES CAN DO …
 Overwrites boot sector
 Formats all/part of the
disk
 Corrupts programs/data
files
 Causes harm to the
network

12. WHO WOULD CREATE A
COMPUTER VIRUS
 THE WHIZ KID
 THE KSPs
 THE TERRORIST
 THE BUSINESSMAN
 THE RESEARCHER

13. SYMPTOMS of VIRUS INFECTION
 The computer runs slower than usual.
 The computer stops responding, or it
locks up frequently.
 The computer crashes, and then it
restarts every few minutes
 The computer restarts on its own.
Additionally, the computer does not run
as usual.

14. SYMPTOMS of VIRUS INFECTION
 Applications
on the computer do
not work correctly.
 Disksor disk drives are
inaccessible.
 You cannot print items correctly.
 You see unusual error messages.

15. SYMPTOMS of VIRUS INFECTION
 You see distorted menus and dialog
boxes.
 There is a double extension on an
attachment that you recently opened,
such as a .jpg, .vbs, .gif, or .exe. extension
 An antivirus program is disabled for no
reason. Additionally, the antivirus
program cannot be restarted
 An antivirus program cannot be installed
on the computer, or the antivirus
program will not run.

16. SYMPTOMS of VIRUS INFECTION
 New icons appear on the desktop that
you did not put there, or the icons are
not associated with any recently
installed programs.
 Strange sounds or music plays from the
speakers unexpectedly.
 A program disappears from the computer
even though you did not intentionally
remove the program.
 Some elusive viruses won’t show any
symptoms at all

17. GUIDE for a VIRUS FREE
COMPUTING
 Know your computer
 Keep original copies of
your executable programs
in a safe place and backup
data files regularly
 Control system access

18. GUIDE for a VIRUS FREE
COMPUTING
 Scan all foreign
diskettes/ removable
storage you plan to use
 Use only software from
reliable sources
 Maintain a library of
anti-virus tools,
utilities, diagnostics,
etc.

19. GUIDES for a VIRUS FREE
COMPUTING
 If possible, have the file
attributes of your important
programs set to read-only to
prevent accidental overwriting
 If you suspect disk virus
infection, consult a reliable
adviser.

20. Current Trends
in
Information
Technology

21. MICROPROCESSORS for Power
Users

22. MICROPROCESSORS for Home
Users

23. MICROPROCESSORS for
Netbook Users

24. MICROPROCESSORS for
Netbook Users

25. HARD DRIVES

26. MOBILE COMPUTING

27. PRINTERS

28. SOFTWARE/PROGRAMS

29. INTERNET COMPUTING