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[CrackMe] .NET Klinzter v1.4


Klinzter
Go to solution Solved by kao,

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  • Solution

klintzer14.png


 


 


Perhaps you could spend some time reading this forum and learning basics before making your next attempt? This is not even a 5-minute challenge.


 


3 bytes changed. Used tools: ILSpy and HIEW (but any good .NET decompiler and hex editor will do). Most people would use de4dot, Reflector and Reflexil - but that would modify the entire executable. :)

crackme-patched.zip

  • Like 1
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kao, thats exactly what I was looking for.. I way to crack it without modifying the entire exe file..


now my question to you since the file is obfuscated how did you manage to find the location to patch..


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Obfuscation is just a minor slowdown if you know what you're looking for. ;)


 


Start with your crackme without obfuscation. Learn to find the important comparison and patch it using Reflexil - there are plenty of tutorials about that.


Then learn to make the same patch using hex editor - there are tutorials about that as well.


And after that - try to do the same with your obfuscated crackme. You'll see that it's just slightly harder because function names and strings are gone..


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Here's mine patched. Tools used:


 - de4dot (Removal of SmartAssembly)


 - Greywolf (IL editor to remove various IL from the button click method to force always registered.)


 


Original function was:


private void method_0(object sender, EventArgs e)
{
    try
    {
        if (Operators.CompareString(this.vmethod_4().Text, "6594682899080", false) == 0)
        {
            this.vmethod_2().Text = "Registered!";
        }
        else
        {
            this.vmethod_2().Text = "Not Registered!";
        }
    }
    catch (Exception expr_3D)
    {
        ProjectData.SetProjectError(expr_3D);
        Exception ex = expr_3D;
        Debug.Print("cmdStart_Click: " + ex.Message);
        ProjectData.ClearProjectError();
    }
}

Cracked.7z

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@Death: your patch will work incorrectly, if correct serial will be entered.


 


EDIT: Nevermind, I'm wrong. Nice patch! :)


Edited by kao
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