The viruses as they can be
All PC viruses can be separated into several groups by actions they perform.
There are some harmless viruses that multiply and do whatever never revealing themselves. The only secondary effect of them is a decrease of free space on hard drive but usually they don’t take lots of it.
The next stage is not dangerous viruses that reveal themselves by various sound, graphics or text effects. They might start playing some song or turn the screen upside down but all data on your PC would remain untouched and all your software would work correctly.
Unfortunately, the viruses’ developers do not limit themselves by above jokes as most of the viruses cause malfunctions in your PC and buzzing of your software. In worst cases the viruses have integrated algorithms that delete or distort your hard drive data. One of them is the “OneHalf” virus that caused pandemic 2-3 years ago as it encoded the hard drive data at the same time causes constant Windows buzzing and in certain conditions it “was forgetting” the key to the code. More primitive viruses may just erase the disliked files or stuff them with some crap instead of data. Not dangerous viruses may also harm the computers as their developers’ mistakes may lead to fatal results.
Periodically the mass media brings up news about the viruses able to spoil monitors, break hard drives and cause other “physical” damages. As no one has seen them it still can be considered a myth. If not one case… In summer of 1998 Europeans suffered the pandemic of Win95.CIH that came from South-East Asia. The virus destroyed PC BIOS causing damages to the system card. It’s developers used a fact that most computers flash-BIOS is rewritable so the virus was rewriting it with random trash and the system cards then had no chances to be restored. Though, the Russian virusologists of “Kasperskyy Lab” found a cure from that virus just after its appearance.
Now, let’s look at the “way of life” of different viruses. The firs category of them would be the “boot-sector” viruses. They get activated in time of PC startup and live in drives’ system areas that PC refers to when getting started. They may be transmitted as via disks as via files (file-boot viruses).
The second category is the file viruses that live in executable files and infect them. The virus gets activated with file activation and starts it destructive actions then. They are easily transmitted and widely used. Also, this category has viruses that live in PC networks, network protocols and OS. Taking into account the Internet popularity the development of such viruses is the most perspective now.
Finally, the youngest and the most common category now are the “macro viruses”. They are the products of MS Office development as now MS Word and Excel are able not only deal with texts and tables but also thanks to integrated tools develop complicated programs including viruses. The prompt macro viruses transmitting is caused by big documents exchange in formats that are considered the standard now. And as users got used to viruses living only in executable files they treat the documents files without any caution.
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