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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153 views

Cyber security student wanting to start learning reverse engineering

I'm really interested in learning reverse engineering. Especially in regards to malware. Any help is much appreciated What should I learn before I start to learn reverse engineering? Is learning C/...
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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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'local call from' in x64dbg

In OllyDbg there was a thing called "local call from xxx,xxx,xxx,xxx ... " which helps me know from where a function is being called in the entire module. Does such a feature exist in x64dbg as well?
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OllyDbg - After restarting program, breakpoints lost

I am new to OllyDbg and I made a small (.NET Console App) program to test if I can crack the password. To set the break point where it writes Incorrect password. I need to run the program first. But ...
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55 views

Process terminating when breakpoint reached

I want to set breakpoint on the recv function to replace the received packets. But, I can not put breakpoint on any instruction in the program, the process simply closes with code 4000001f. I also ...
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0answers
37 views

How to redirect stdin in OllyDbg?

When I use IDA, I can use stdin from the file as in bash. When I tried to do it in OllyDbg, it processed the parameters simply as a string. Can I redirect stdin in OllyDbg?
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1answer
50 views

To find a keyboard shortcut inside an application

The app has a "secret dialog window" and I'm sure it appears after pressing combination of some buttons. How I can find the combination in this app?
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66 views

Hearts Game Passing Cards

I'm trying to make this Hearts game so that i can select more than 3 cards. This is the func that will compare how many cards i've chosen with 3 it'll jump to this address if > 3 so i replace the ...
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2answers
91 views

Issue with debugger - black screen and freeeze after loading game executable

I have issue with debugging. When I try to load game executable to debugger and go to certain place in code, game window shows up but it is black and it looks freezed. I can't even go back to debugger ...
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1answer
99 views

Call Stack vs Intermodular Calls in Ollydbg

What is the difference between call stack and intermodular calls. Could you clarify the difference between the two? For example if I need to catch message box API function, do these methods serve the ...
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25 views

All referenced strings using ollydbg

i was trying to search for "All referenced strings using ollydbg v1.10 and got some error "could not read memory of debugged processt(77550000..77626fff) kindly help me solve the problem.[ ][1]
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1answer
146 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
875 views

Understanding AutoIT “compilation”

I'm trying to de-compile a cheat created for my game so I can fix it. The problem is the version used is 3.3.14.2 which no longer has official de-compiler support. I have tried looking for 3rd party ...
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1answer
80 views

Program closing even with IsDebuggerPresent Patched!

i'm in some serious problems when trying to debug a program with ollydbg, i patched IsDebuggerPresent but still after starting debugging with it patched it will Terminate anyways. Steps i Followed ...
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1answer
122 views

OllyDbg “runs away” when stepping over wininet.HttpSendRequestW

I'm, using OllyDbg 1.1 to debug some malware and it's been quite a while since I've dealt with wininet calls. When I set a software or hardware breakpoint directly after the call to wininet....
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36 views

Getting a full trace (every line) from ollydbg

When I use the ollydbg run trace I don't seem to he getting every single line as I expect to. First off let me explain what Iexpect to see: Address hexDumb Command comments EAX ECX etc... 0042AD43 ...
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52 views

How to figure out what happens during <ModuleEntryPoint> in OLLYDBG

So I have an interesting problem. I have two traces of the same executable, one with an unmodified version of a file and one with a modified version. My hope was to use these traces to identify the ...
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1answer
101 views

Compare two traces from ollydbg

I have a program that executes differently depending on what files are present on my computer. I'd like to run a trace in two scenarios (with the default file and with an edited version of the file) ...
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1answer
324 views

How to see address in Graph view Ida

In Ida when I want to see the address of code I must switch to Text view How can I see the address of code with Graph view ? By the way, is there grapgh viwe in OllyDbg?
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2answers
311 views

How do I tell OllyDbg where my source code is?

I am aware of this question, but I don't understand the only answer given. How do I tell OllyDbg where the source code is when I have no PDB file (debug symbols) available?
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1answer
90 views

Is there any debugger that supports step-back? [duplicate]

In Ida when I use debugger, but I can't step back. Is there any debugger that allow go backwards?
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1answer
183 views

Debugger Win32 Local vs WinDbg in Ida vs Ollydbg

When I do dynamic analyze of exe file I have few option , and I want to know what are the advantages and disadvantages. I know that Ida designated for static analyze , but there are some debugger in ...
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201 views

Manually unpacking DarkTequila, stumped. Can anyone help?

The malware is packed w/ UPX - can see 0/1 in sections. Sure, I can can a tool or even use UPX -d -o flags .exe to create an unpacked copy with a >97% ratio, however I want to MANUALLY unpack it to ...
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2answers
128 views

Can't find SetCooperativeLevel call in disassembled program

I am trying to make some changes to the setup program that installs the game "Emperor: Battle for Dune". If you want to look at the EXE I am working on, you can download a copy of this setup program ...
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1answer
5k views

General consensus on Lena's tutorials? [closed]

I often see Lenas "reversing for newbies" talked about as a very solid introduction to reverse engineering. It uses OllyDbg as the primary program. (I'd be more interested personally in using IDA, ...
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4k views

OllyDbg vs x64dbg - Is there anything in OllyDbg that is not available in x64dbg?

OllyDbg had been nice in the past, but as it was frozen, x32dbg/x64dbg era came. However, some people still use OllyDbg. Are there any reasons to use the old OllyDbg still? Doesn't x32dbg/64dbg covers ...
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1answer
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What is happening with these exceptions in OllyDbg?

I am trying to reverse engineer something which appears to purposely create exceptions as part of its logic. In the image below, there are multiple DIV EAX commands that generate division by 0 ...
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1answer
1k views

Reversing a program with dongle

So I'm learning Reverse Engineering / Software cracking. I have a program that I am practicing on that requires a dongle in order for the program to start. From looking through the disassembly ...
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2answers
1k views

Ollydbg terminated while loading dll

When I try to load a DLL of a game client I get this error: How can I completely load this dll?
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4answers
3k views

Best alternatives to IDA Pro, Immunity and OllyDbg for a blind user

I am totally blind and want to learn to do reverse engineering so I can advance my career. Unfortunately, IDA Pro, Immunity and OllyDbg are all not accessible to a blind person using a screenreader. ...
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0answers
77 views

What is the OllyDbg SFX Feature equivalent in IDA Pro to find the OEP?

OllyDbg has this nice feature to find the OEP called SFX: IDA has the universal PE Unpacker plugin but it works a little bit different. What is the OllyDbg SFX Feature equivalent in IDA Pro to ...
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1answer
171 views

Disassembly - Why the CMP instruction is multiplying by 2 the value being compared

I'll get right to the point, I have a crack me program, that is a program with a password inside that needs to be found so that you can complete the challenge. I easily found the cmp instruction ...
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1answer
545 views

Command for Command line plugin does not work

I need to analyse a sample which creates a child process. I want to analyze the child process, too, but I have the following problem. Therefore, I take the command line plugin for my olldbg v1.10 and ...
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2answers
218 views

replacing static value with variable

I'm trying to replace a static value: MOV DWORD PTR SS:[EBP-30],4c With a value from a specific address: MOV DWORD PTR SS:[EBP-30],400400 // MOV DWORD PTR SS:[EBP-30],OFFSET 400400 But SS:[EBP-30] ...
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1answer
157 views

On ollydbg how do I find a string in code that I find on memory map?

The license is saved in a txt and I can't find the string. The code is protected as it calls to encodepointer and some modules are hidden. I'm using ollydbg 2.01 with olly ext1.8 every option ...
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2answers
1k views

Hooking functions in a VMProtect'ed executable

I'm trying to solve the Sharif CTF 2016 HI2.exe challenge. This challenge requires a specific (impossible to reach) environment (64 processors, 128GB RAM, ...) to display the flag. As the executable ...
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1answer
142 views

Ollydbg to change int length of compiled code

being a complete noob in reversing I may have taken on too much here--I have an old piece of software, cadcam, that is still good and functions well but is limited in the size of a number it can allow ...
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2answers
4k views

How to load a script in ollydbg

I decided to start learning Reverse Engineering and picked Ollydbg to start my path. Figured out how to install plugins, but I want to run a script for specific program to help me with the reverse. It ...
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3answers
442 views

How to debug ServiceMain function of a service?

I have a malware which is checking for keyboard type and locale information. After that, it creates a service with BinaryPathName as malware's exe address. After creating a service, malware starts it ...
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2answers
12k views

How to find arrays of objects (entities, enemies) in a game I'm reversing with Cheat Engine?

I am reversing a game using Cheat Engine and OllyDBG, through this memory addresses within an FPS game are read and monitored, these addresses will contain the coordinates(xyz) of enemies. My ...
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3answers
11k views

Ollydbg does not find all referenced strings while Reverse Engineering AoneVideo2AudioConverter

I am following this tutorial on reverse engineering. In the step where I "search for all referenced strings" I get a window as follows: When compared to the image on the tutorial for the step, I ...
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2answers
435 views

How to set a Mouse Click BreakPoint in OllyDbg?

In the debugger program OllyDbg, How do I set a breakpoint when the left mouse button is pressed? It doesn't matter what it clicks on, so upon mouse click, the breakpoint stops the debugger.
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2answers
3k views

Can't find “referenced string” in OllyDBG

So I am trying to reverse a program but I am not able to find any of the Strings through searching for "referenced Strings" or "binary Strings", I am new to OllyDBG and I don't know a lot about it, ...
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2answers
1k views

How are addresses calculated from the values in x86 segment registers?

How are the 16-bit values in segment registers used to represent large memory addresses? ES 0023 32bit 0(FFFFFFFF) CS 001B 32bit 0(FFFFFFFF) SS 0023 32bit 0(FFFFFFFF) DS 0023 32bit 0(FFFFFFFF) FS ...
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1answer
67 views

OD mode change from kernel to normal

I face a problem, when od is loaded and open win32 application, it auto go to kernel mode, can we change to normal mode? thanks
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1answer
152 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
143 views

My Shellcode is in a non-executable part of a Windows executable. Is there still a way to execute it?

I'm trying to exploit a test server executable that holds some user-controlled data in memory. I can gain control of EIP and go there, however I get an access violation in OllyDBG because it's not ...
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1answer
155 views

Patching a program in memory at a certain point of time

I'm using OllyDbg to patch a value and I need to patch a certain value when the program gets mapped in memory, how can I do this? I don't want to patch the value in file, but only in memory after the ...
4
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1answer
364 views

getting the static address/offset of a variable

I'm fairly new to reverse engineering at all and I'm currently struggling to get the static offset/address of a variable of a program I've written myself. So I've written the following program in C++,...
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2answers
2k views

What is the difference between IDA and OllyDbg?

When I want to debug an exe in Windows, what advantages does OllyDbg have over IDA? In IDA, I'm using the WinDbg debugger back-end.