A computer virus is a piece of software that intentionally was create to achieve a goal without the permission of the user.
Those goals can be but are not limited to:
-steal data
-encrypt data
-create an access point to remote control your hardware
-annoy the user
-destroy machines and hardware (usually limited to industrial hardware)
After those goals are achieved, the creator of the virus can:
-blackmail you
-sell your data
-enjoy the chaos created
-use your hardware for another attack
A piece of code isn’t that hard to be created.
There are easy tutorials for “viruses” that let pop up faces of Nicholas Cage on your PC while you use it that are shorter than an hour.
The main problem is to bypass security measures and most of the time those are by passed by human factors, even today is the best anti-virus software a cautious and well trained user.
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