Nature of Viruses
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by: Guest
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Virus is a program which infects other programs in the computer and includes an additional version of it. Often people think that a virus is a sign of mass destruction and feel chaos on its detection but there are few viruses that can cause a major damage to the system but mostly viruses can be removed with the help of some software. A computer virus carries in its instructional code the capability for making copies of it.
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Virus is a program which infects other programs in the computer and includes an additional version of it. Often people think that a virus is a sign of mass destruction and feel chaos on its detection but there are few viruses that can cause a major damage to the system but mostly viruses can be removed with the help of some software.
A computer virus carries in its instructional code the capability for making copies of it. A typical virus takes temporary control of a computer disc operating system. Whenever the infected computer comes into contact with an uninfected peace of software, a fresh copy of the virus passes into the new program. Thus the virus can spread from computer to computer or by swapping disc. A virus can do anything that other programs do, the only difference is that it attaches itself to another program and executes secretly every time the host program is run. If this was all that there were to viruses, they would not cause concern unfortunately, after a virus is executing, it can perform any function, such as erasing files and programs.
A simple virus that does nothing more than infect program might work something like this. Find the first program instruction. Replace it with a jump to the memory location following the last instruction in the program. Insert a copy of the virus code at that location. Have the virus simulate the instruction replaced by the jump. Jump back to the second instruction of the host program. Finish executing the host program.
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