Questions tagged [ollydbg]

A very popular Windows 32bits debugger written by Oleh Yuschuk. It is free and lightweight and yet powerful and extendable through plugins.

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1answer
854 views

ollydbg: how to set a breakpoint at program exit?

How can I break right when the program I am debugging quits? I don't know how to even locate the relevant code.
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1answer
813 views

How to crack windowed crackmes?

I am starting with reverse engineering/cracking with advanced knowledge about programming and functioning of the operating system and I saw a whole series of lena151 Lenas Reversing for Newbies but I ...
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2answers
313 views

How to know what does the function do?

I've made a simple c++ program. In the ollydbg i searching for the string which is my name, there are 2-3 call functions near the string location but i don't know what those function do. My question ...
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1answer
974 views

How to find functions in IDA Pro/x64dbg

i created a program for testing, very simple in c++. is ask for password if it is match is print correct, if no it is print "bad". i try to find with ida where is the function of what i made. but i ...
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1answer
281 views

how to find the strings values in a comparision using ollydbg

In OllyDbg 1.10 (assembler level deubugger) I can find all referenced text strings The program compare if a user input string is equal a internal string. When I debug the program, I can't find the ...
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1answer
502 views

How to set a label to a memory address in ollydbg2

I have a lot of CALL 0x000XYZW in my code. I want to tell ollydbg that 0x000XYZW address is the function "my_function", and then see CALL my_function in my CPU window. Is it possible to do that ? ...
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1answer
559 views

Wrong default starting address

I have no idea how, when or why, but now, the "default address" (the one executed when pressing F9) is 0x77960884. It should be 0x00401000 (when I manually go to 0x00401000, everything works). The ...
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4answers
1k views

How to add new button to an executable?

My target exe file has a button. It will display a webpage when the button is clicked on. I used OllyDBG to disassemble this file. My questions are: How can I find the url of this webpage? I have ...
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1answer
420 views

Assembly analyze C system() function

So I made a very simple C program to study how C works on the inside. It has just 1 line in the main() excluding return 0: system("cls"); If I use ollydebugger to analyze this program It will show ...
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1answer
123 views

How to get same compare result of Eax value in all window OS [closed]

I just started learning assembly. This is how it look in Ollydbg over Windows XpSp3 32Bit: MOV EAX,ESP ADD EAX,0x20 CMP EAX,0xFFFFF JLE SHORT 008A3E51 CMP EAX,0x12A5B0 JLE SHORT 008A3E38 JMP SHORT ...
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1answer
146 views

How can I do this in less than 10 bytes of space?

I have some value stored at a memory location. I have 10 bytes of space and have following to do: push registers copy a string constant "abcedfghijkl" to that memory location restore registers Is it ...
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1answer
424 views

Change value of an IF condition found in IDA

so I have the .idb file of an executeable I want to modify. In the IDB file, I found this code And I basically want to change 4111006 to 1006 in that IF condition. however, when I press TAB to go to ...
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1answer
5k views

Set a breakpoint before WriteFile operation in OllyDbg [closed]

In the process monitor, I see a WriteFile operation. How can I set a breakpoint and view everything about this operation in OllyDbg? If this is not possible with OllyDbg, what other tools can I use?

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