COMPUTER/ICT NOTES FORM ONE TOPIC 4: COMPUTER HANDLING

MALICIOUS PROGRAMS

A VIRUS:  Is a program that infect an executable file

EFFECT OF VIRUS

1) File function is different way than before

2) Maybe only displaying a began massage on the monitor

3) Maybe deleting some or all file on the user’s hard drive

4) Maybe altering data files.There are two key features of a computer virus.

1) The ability to propagate by attaching itself to executable files.

2) The virus causes harm only after it has infected an executable file and the executable file is urn.

A WORM:  Is a malicious program that copies itself 

DIFFERENT BETWEEN WORM AND VIRUS

TROJAN HORSE:   Is a deceptively labeled program that contains at and that harms the user.

DIFFERENT BETWEEN TROJAN HORSE AND VIRUS

A Trojan horse does not replicate, which distinguishes it from viruses and worms.

EFFECT OF TROJAN HORSE

1)     Trojan horses allow a hacker to remotely control the victim’s computer.

2)     Perhaps to collect passwords and credit card number and send them to the hacker.

3)     Perhaps to launch dervial of service attacks on websites

A LOGIC BOMB: 

 Is a program that “detonates“ when some event occurs. The detonated program might stop working (e.g: go into an infinite loop) crash the computer, release a virus, and delete data files or any of many other harmful possibilities.

A TIME BOMB: 

 Is a type of logic bomb in which the program detonates when the computer clock reaches some target date.

Some function about the destruction between a virus and a worm is caused by two distinctly different criteria.

1)     A virus infects an executable file  while a worms is a stand – alone program

2)     Virus requires human action to propagate, while worm propagate automatically.

SPYWARE:   This is malicious software that hides on computer without user knowledge.

AD-WARE:  This is malicious software that installed onto your computer by internet advertising that allow them to inundate you with pop up messages.