Reversing in Action using IDA Pro: Now it is time to get in action with reversing and cracking our crackme [Reference 1]. Here are our tasks, Remove splash screen -> I am leaving this task for you? Find Hard Coded Password -> we will work on this. Write a keygen -> we will work on this. Load file into IDA Pro.
Please, prompt where there is a check of a condition in a code? How to define, what the password from a crackme is 'Benadryl' in IDA Pro? As I understood, there is a call of the 'call sub_4038D0' function if over the password correct, we jump on loc_42D555. Help to understand how it works?
Resulting register values. By using this information, it can determine the execution flow of the application, and detect registers which were modified by a given instruction. The computer running the IDA Pro interface will be called the 'debugger client'. • Functions tracing: IDA will record all function calls and function returns. How to crack softeare, how to use IDA Pro, Reverse Engineering, Softeware RE In this post, we will learn how to use the demo version of IDA Pro to disassemble, debug, and crack a simple crackMe software.
1 Answer
jz short loc_42D555 jumps to loc_42D555 if the zero flag is set. Otherwise it executes the next instruction.
Note that the next instruction is where the failure string ('Wrong code DUDE') is referenced. Also note that loc_42D555 is the address where the success string ('Thanks you made...') is referenced.
So if the zero flag is set at the jz short loc_42D555 instruction, you probably solved the crackme.
In the preceding instruction, the sub_41A1b8 function is called. Most likely this function sets the zero flag if the strings referenced in eax and edx (in this case, your input string and 'Benadryl') are equal, but you would need to analyze the sub_41A1b8 function to know this for sure.
To understand this, you'll need to learn x86 assembly. There are plentyoftutorials out there to help you get started.
Ida Pro 7.1 Crack
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