WHAT IS A COMPUTER VIRUS?Computer Virus is acomputer program,designed as a prank ora sabotage, thatreplicates itself byattaching to otherprograms and carryingout unwanted andsometimes damagingoperations.
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 users interaction with the computer, without the users 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) HARMCOMPUTERVIRUSES 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. Disksor 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 FREECOMPUTING 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.