Transcript
Computer Viruses
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
Examples of MALWARES
Computer viruses
Worms
Trojan horses
Spyware
Dishonest adware
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.
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.
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.
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.
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
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,
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.
(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
WHO WOULD CREATE A COMPUTER VIRUS
THE WHIZ KID
THE KSPs
THE TERRORIST
THE BUSINESSMAN
THE RESEARCHER
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.
SYMPTOMS of VIRUS INFECTION
Applications on the computer do not work correctly.
Disks or disk drives are inaccessible.
You cannot print items correctly.
You see unusual error messages.
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.
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
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
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.
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.
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