What is Olly Debugger?
From the author, Oleh Yuschuk, “OllyDbg is a 32-bit assembler level analysing debugger for Microsoft® Windows®. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable. ” Olly is also a “dynamic” debugger, meaning it allows the user to change quite a few things as the program is running. This is very important when experimenting with a binary, trying to figure out how it works. Olly has many, many great features, and that is why it is probably the number one debugger used for reverse engineering (at least in ring 3, but we’ll get to that later.)