Hello readers, hope you all are fine,
Dear ones as you all are using PCs in one or the other way, it is obvious that virus is one of the basic word which flashes through mind when we talk about PC problem. I am sharing my knowledge about the same :
What are viruses : Little programmes or scripts designed to lay digital garbage to your PC.when triggered it destroy data files or system files, some execute other unwanted software by providing smooth way to your system,some nefarious ones steal the confidential informations, some multiply themselves to slow down or full your PC with its own replicas even there are few which rig the system power load and cause to catch it a fire.
Virus is simply categorised into :
Replicators : A developer developed a game during nineties, in which when a fencer/ sword master hits a demon with his sword and cuts the demon into pieces, as per programme not all but few bits of demon regenerated themselves in full demon again. Due to some erronous writing the programme transformed and not a few but all pieces of demon regenerated into a new full demon hence the demon kept on multiplying with every hit. thereby filling whole computer with single demon file and functioning of system stops. same is still existing in one or the other form.Good AV proves useful in controlling it.
Multi morphs : A genre of replicators/ multipliers, but these virus while making copy of its own change its programme little bit different from that of previous one and ultimately its functionally and spreads differently in different areas of PC. Every copy of new virus if forms is different from the parent. AV does not able to detect all hence this virus resides easily in the system.
Overwriting virus : these virus overwrite the programmes of the softwares and thereby making them to crash or malfunction. an overwriting virus destroys the oringinal file it infects. It does this by overwriting data in the system’s memory. The virus can be removed only by deleting the infected file. Often, cleaning an overwriting virus means losing the infected programs and reinstalling them.
Boot Sector Virus : Boot sector is a section in the system file which execute to boot the system. Boot sector virus hide inside the boot sector and execute itself before operating system starts and hence disallowing some programmes or even whole operating system to get started.
Residents : Virus which start itself with booting of machine are resident viruses. These virus don’t need any click to get started bu start itself with start of PC.It is able to do this because it stores and hides within the memory of the infected computer.
Non resident are those which needs to be executed by click or triggering some programme on the computer.
Mutlisector Virus : Also called multipartite virus , these kind of virus attacks both boot sector as well as system files as the same time infecting computer at serious levels. Because of this dual infection approach, the multipartite virus can re-infect the same system over and over again until fully eradicated.
The Macintosh didn’t release until 1984. However, the first virus for it was made by a 15 year old. Known as Elk Cloner, this virus infected the boot sector of Apple II computers. Interestingly, the first IBM PC virus (known as Brain) did not appear until 1986.
The field is quite vast this is only a drop, but still ,……..
Hope it will be helpful knowledge about virus