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working of Viruses & Worms


In the above figure. it is explained diagrammatically that Virus code (V1/V2) is attached to the executable file (E1/E2/E3), when virus comes in contact with executable file it affects the file in two ways:
  1. Virus code attached in the beginning and at the end of the executable file: in this case it is possible for the user to scan that virus infected file with the antivirus. Antivirus will remove the virus code and user can get the original file back with data.
  2. In the second case (Figure 1.1.2), virus will first erase the data in the executable file and then it will attach virus code (V1/V2) to the executable file (E1/E2/E3), in this case if user will try to scan that file with antivirus, antivirus will delete that file completely and in this case there are no chances to recover the data.

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