27-11-2012, 01:02 PM
SEMINAR ON COMPUTER VIRUS
computer_virus_.ppt (Size: 421 KB / Downloads: 37)
Introduction
Computer virus have become today’s headline news
With the increasing use of the Internet, it has become easier for virus to spread
Virus show us loopholes in software
Most virus are targeted at the MS Windows OS
What is a virus?
Virus is vital Information& Resource under seize. A computer virus is basically a program written for destructive purpose. It is written in such a way that it can enter the computer without the knowledge of the machine or the user. It is enters the machine through an infected floppy or a program. It has the capacity to make perfect copies of itself and cause abnormal functioning of the machine.
Types of virus
There are basically two types of virus, FILE virus and the BOOT SECTOR virus depending on the disk areas they infect and the way in which they spread. A file virus infects only executable file those with extension .EXE, .COM, etc. some virus destroy data files as well but viruses with an intention of spreading infect only the executable files.
Background
There are estimated 30,000 computer viruses in existence
Over 300 new ones are created each month
First virus was created to show loopholes in software
Symptoms of Virus Attack
Computer runs slower then usual
Computer no longer boots up
Screen sometimes flicker
PC speaker beeps periodically
System crashes for no reason
Files/directories sometimes disappear
Boot sector viruses
Boot sector viruses infect the boot record on hard disks, floppy disks, and theoretically also on CD’s and DVD
Once the infected computer does successfully boot, the boot sector virus stays in memory and infects floppies and other media when they are written to by the infected computer.
Multi-partite viruses
Multi-partite viruses share the characteristics of more than one virus type. For example, a multi-partite computer virus might infect both the boot record and program files.
PREVANTION OF VIRUS ATTACK:
The following precaution should be taken to prevent the entry of virus in to a machine
Avoid booting the machine with a floppy i.e. from A drive.
If it is required to boot from floppy use a known floppy that is virus free and with a write protect .
Write protect disk when using it on unknown machine. No program and hence virus can infect a floppy that is write protected the floppy disk controller and drive mechanism of a properly working disk drive does not allow to write on to a write protected floppy.
Conclusion
You know know more about virus and how:
viruses work through your system
Have seen how viruses show us a loophole in popular software
Most viruses show that they can cause great damage due to loopholes in programming
computer_virus_.ppt (Size: 421 KB / Downloads: 37)
Introduction
Computer virus have become today’s headline news
With the increasing use of the Internet, it has become easier for virus to spread
Virus show us loopholes in software
Most virus are targeted at the MS Windows OS
What is a virus?
Virus is vital Information& Resource under seize. A computer virus is basically a program written for destructive purpose. It is written in such a way that it can enter the computer without the knowledge of the machine or the user. It is enters the machine through an infected floppy or a program. It has the capacity to make perfect copies of itself and cause abnormal functioning of the machine.
Types of virus
There are basically two types of virus, FILE virus and the BOOT SECTOR virus depending on the disk areas they infect and the way in which they spread. A file virus infects only executable file those with extension .EXE, .COM, etc. some virus destroy data files as well but viruses with an intention of spreading infect only the executable files.
Background
There are estimated 30,000 computer viruses in existence
Over 300 new ones are created each month
First virus was created to show loopholes in software
Symptoms of Virus Attack
Computer runs slower then usual
Computer no longer boots up
Screen sometimes flicker
PC speaker beeps periodically
System crashes for no reason
Files/directories sometimes disappear
Boot sector viruses
Boot sector viruses infect the boot record on hard disks, floppy disks, and theoretically also on CD’s and DVD
Once the infected computer does successfully boot, the boot sector virus stays in memory and infects floppies and other media when they are written to by the infected computer.
Multi-partite viruses
Multi-partite viruses share the characteristics of more than one virus type. For example, a multi-partite computer virus might infect both the boot record and program files.
PREVANTION OF VIRUS ATTACK:
The following precaution should be taken to prevent the entry of virus in to a machine
Avoid booting the machine with a floppy i.e. from A drive.
If it is required to boot from floppy use a known floppy that is virus free and with a write protect .
Write protect disk when using it on unknown machine. No program and hence virus can infect a floppy that is write protected the floppy disk controller and drive mechanism of a properly working disk drive does not allow to write on to a write protected floppy.
Conclusion
You know know more about virus and how:
viruses work through your system
Have seen how viruses show us a loophole in popular software
Most viruses show that they can cause great damage due to loopholes in programming