However, you can find its right password by putting breakpoints and analyzing the ASCII dump that got created in the software. There are many ways to do it this is just the beginner level. Now, test your EXE again to see if it is working or not and if it gives the direct Right password message or not. So, what we will do here is that we just skip that logic by putting nop – non operation, by selecting that jump > right click > Binary > Fill with Nop. Click the play button to run the program. Open up the program you wish to bypass with ollydbg. Now, we will find out the two jumps that actually make the comparison and matching for our name and password with its logic. Crack Program Using Ollydbg 2 Download TorrentDownload Ollydbg For Windows 10Ollydbg 2Ollydbg Plugin Downloadthis is the first of my tutorials in using olly debugger and cracking a program using it. Once we find that, we have to check out if it's calling convention code - A jump. We are finding the string – Right Password. Now, we will start to debug, so that we can find the exact referenced string to work out. To understand in an efficient way, try this link: x86 Instruction Set Below, I have shown the reference architecture of X86 registers which are quite useful while dealing with assembly language. The source code you see is X86 assembly language and might be messy if you work it for the first time. We will find those jumps and make them non-operational, that will simply surpass the matching details and print the right password message.Īs you can see, the EXE file is loaded in the software. We will upload this EXE in OllyDbg, then we will debug this file so that we get the source code where we can analyze the code with the help of the right jump conventions in the assembly language. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable. OllyDbg is a 32-bit assembler level analyzing debugger for Microsoft® Windows®. Now, what we are going to do is that we will simply try to surpass this whole wrong password thing to – Right Password with the help of OllyDbg. And, if you get matched with the correct details, you crack the EXE otherwise – nice try !Īs you can see in the above image, the details are wrong and that is why the wrong password message gets printed. In here, we are taking a keygen.exe that is having some requirement such as Enter you name, Enter your password.
So, to remove such a possibility, we can include some meaningless extra code in your source code so that a reverse engineer cannot easily break the software and this is all about the obfuscation. Reverse engineers analyze your source code in assembly language and try to manipulate that source code using debuggers and by that, it removes the security or licensing or maybe they make an alternative software. Obfuscation is a complex term which is nearer to reverse engineering, that shows you the way to secure your source code from reverse engineering.
The other aspect of this is how to reverse engineer any EXE to crack the licensing problem in the software. How to Crack a program using OllyDbg 2.To start with obfuscate, we are taking one reverse engineering tool, which is OllyDbg. How To Crack A Program, Step by Step ( + 100,000 Views) How to Crack a program using OllyDbg 1.Is needed to have more knowledge if you want to crack more. It is necessary to restart OllyDbg in order to work with this plugin. I will not be walking you through crack any software using ollydbg to crack a legitimate program.
If you know the memory location of the variable that the string is written to, you can use a hardware breakpoint on write - byte to break after the instruction/operation that is writing the string to the variable.
Ollydbg 64 bit aka Ollydbg 2.01 is present, but it has not been updated since 2013 by the author & hence not fully functional. Then with 2 keystrokes (Yes, only change 2 letters) the application is cracked. We use OllyDbg 2.0 to open the.exe to view its Assembly code, we then search for a string that will let us find the conditional jump that makes the Trial stop working after 7 days. In this Tutorial, we crack a Face Tracking application called EyeTwig Tracker.