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
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.
