We are going to work with OllyDbg v1.10. You can download this awesome tool from here: OllyDbg v1.10.
The next step would be to run the program by double clicking on the executable. After that, we can see that a MS-DOS window is launched and the program requires us to type the serial number. We type a sentence in order to check the program's behavior.
We have not figured out the serial number... It seems logical...
We are going to type a sentence which will be easily recognizable.
If we come back to OllyDbg we can see our sentence in the Arg1.
This post is focus on show you some techniques using OllyDbg. It is only a game to get more reversing engineer skills to research malware. Please, don't contact me to crack programs, it is illegal... I recommend you use to use free software!!!! :P