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Ollydbg
Ollydbg




ollydbg

Special highlights are: Intuitive user interface, no cryptical commands. mov dword ptr ANYSEG: ANYREGISTER + SOMECONST (again it is mov that drives the search not the operand. OllyDbg is a shareware, but you can download and use it for free. push dword ptr anyseg: ANY register +SOMECONST (the keyword being the mnemonic) or. It is often used by crackers to crack software made by other developers. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable. OllyDbg is often used for reverse engineering of programs.

ollydbg

You can see that MSGW structure contain 111 which is WM_COMMAND

ollydbg

Although, there are many tools that can achieve the same objective, the beauty behind OllyDbg is that it is simple to operate and freely. MSG Structure is as below typedef struct tagMSG ħ744CDE8 Conditional breakpoint at USER32.GetMessageW The objective of writing this paper is to explain how to crack an executable without peeping at its source code by using the OllyDbg tool.






Ollydbg