Programming A Virus
Why is everybody scared of computer virus ? because it causes harmful actions to our data and system !! right ?
Logic – If we go to the root, virus just do something that is not desired. Example if we write a program that erases 1 byte from any exe file, that is a virus because the file is no more usable. The main idea is to force a user to run the virus code. This is done by attaching it or embedding the object file along with some utilities.
Code For TSR Virus – Following here is an example code for TSR virus. This is not much harmful. It just changes the attribute (color) of characters present on the screen.
Way For Anti Virus – Every virus has a signature which is easy to match. By this signature only, the identity of virus is done. So, for detecting virus, just search the signature (known as virus definition) in files. 🙂
Caution – Try this programming at your own risk !!
Tech Bytes !! 
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