Computer viruses are generally understood as software which is inputted to a computer system which allows self replication and thus destroying the system. A virus needs aid for its transfer from one computer system to another system. Virus do take large amount of computer memory thus results in system collapse. Virus is categorized as various forms based on their features.
This sort of virus is generally if scripted as a common application such as Word or Excel and is replicated by infecting documents. Theses viruses are known as platform- independent and they are written in the same language as the application. This virus replicates it self when the compatible programs run on system and thus virus destroys the operating system. Among thousands of existing macro virus each virus is considered major threat.
Network virus is a sort of virus which spreads through LAN and most of the time through internet as well. These are viruses which replicates and travel through the shared resources. When such sort of virus infects a system it moves through the network to search for a potentially new prey. When it completes destroying its prey it moves forward for another prey and cycle continues.
This is a sort of code which is inputted in a software system, when desired condition is met, this virus is set off. These viruses are generally set off during days like April fool day or 13th Friday. When this virus is activated numerous files got deleted.
This sort of virus takes advantage of MS-DOS. This virus is functioned to create a new file, generally with a “.com” and sometimes as “.exd” as extension. When a computer user type in the desired program without adding the extension DOS on its own makes exemption that user requires the file with the extension which comes in the first alphabet and thus initiates the virus. This sort of virus doesn’t find itself compatible to windows XP or other operating systems.
This sort of viruses are generally found hidden in the boot sector or either bootable disk or even the hard drive. This virus doesn’t destroy files in hard disk rather harms hard disk itself. These virus are uncommon now days but were hugest threat a decade back.
This sort of virus does generally infect the media and usually hides itself in memory of the system. it gradually moves to he boot sector inside the hard disk and results infection in files in side the computer and later through out the computer.
