Types of virus
There are following:
- Boot Sector Virus
A disk divide into tracks and sectors. The disk that contains
operating system has a special program in its first sector. The sector is known
as boot sector. The program in boot sector is automatically loaded in memory
when computer starts. The program then loads operating system in the memory.
The boot sector virus modifies the program in the boot sector.
- Chernobal Virus
The famous chernobal virus deletes all Microsoft Office files. It
also deletes the partition information from the disk that causes a major loss
of data.
- Logic Bomb
Logic bomb is also called time bomb. It differs from other viruses.
It is activated at a certain date and time. Michelangelo is an important logic
bomb. It destroy data on the hard disk on August 20.
- Trojan Horse.
Trojan Horse hides itself as useful program. it contains hidden
instruction to erase data or cause other damage. It execute illegal,
destructive instructions in the middle of a program such as computer game.
FormatC is an example of a Trojan Horse.
- Redlof
It is a polymorphic virus. it is written in Visual Basic Script. it
relies on the Microsoft Active X component to execute itself. It locates
Folders.htt and infects that file.
