Questions tagged [x64dbg]
An open-source x64/x32 debugger for windows with UI inspired by OllyDbg.
214
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Scylla error on FThunk import (manually unpacking UPX)
I'm trying to practice on manual unpacking starting from UPX.
I'm using putty.exe x64
This is what I'm doing:
upx -o putty_packed.exe putty.exe
Disable Dynamic base (ASLR) using CFF Explorer on ...
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2
answers
77
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reversing pyinstaller compiled exe
i created some compiled binaries using different languages and tried to understand them using x64dbg, the compiled binaries produced by the c language/gcc compiler were pretty easy to understand, then ...
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36
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Logging function call in x64dbg without asm
I want to log every call of the function to see the what parameters are passed and function result. Currently I'm loading a DLL module, hook function I need and then see function output in my log file....
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106
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Need Help Cracking a Program
So I've got this .exe that I want to crack. It's an old management system for people in truck loading business.
I kind of understand what's happening with window API calls but I'm unable to access the ...
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34
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Exe self-modifies strings searched in debugger
I'm studying a Windows binary file and while searching for some string I noticed the EXE modifies the searched string, e.g., if I search "This is a string", it's modified to "his is a ...
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113
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Retrieve hardcoded string in WinDev compiled app
I wrote an application with WinDev allowing you to open encrypted PDFs without the user having to enter or know the password.
This of course only works with PDFs that I have encrypted myself, always ...
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36
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X64dbg question
I got a program that I try to patch. Normally you get a message box or something to get at the right point in program. But this program behaves else. It opens, then you can type in your license number ...
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27
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Is it possible to create a CStringT struct in x32dbg/x64dbg to make them more readable?
I'm working on analyzing a program which makes extensive use of CStringT but I am unclear as to how these are represented in memory, as it does not seem to be consistent. For example using a x32dbg, ...
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1
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96
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Create exe that jumps directly into main()-function from C
I am using x64dbg to explore image files on Windows. After the computer finishes prowling ntdll.dll it jumps to OptionalHeader.AddressOfEntryPoint.
But this is not my main()-function.
What is this ...
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53
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Can't find the error message in x32dbg
Am trying to reverse an activation program using the error message in reference string
but searching for the string is not successful "all modules - string reference"
tried to pause after ...
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2
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164
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How can I jump to the start/end of a function in x64dbg?
I'm currently debugging a program using x64dbg, and I'm wondering how to quickly jump to the start or end (prologue/epilogue) of a function while I'm in the middle of it. I couldn't find this ...
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82
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Notepad can find my string, but x64dbg can't
I open v2game.exe with notepad, and I can see string "teleport" occurs a bunch of times.
Now I open v2game.exe with x64dbg (not running the exe). x64dbg can't find the needed string. Why? ...
- 133
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99
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Techniques for analysing an exe file
I am learning to use x64dbg application and I am exploring different methods for studying an application.
So far I know of only a few techniques as listed below:
String References Search
Call Stack
...
- 31
2
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0
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131
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Help with reversing an application with x64dbg
I am a newbie to reverse engineering. I am trying to reverse engineer an app that uses some form of internet explorer frame kind of thing because I could see use of mshtml.dll and jscript9.dll and ...
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197
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Load PDB for MemoryModule-loaded DLL in x64dbg
I need to debug a DLL, which I have a PDB file for.
The debug target is a program, that loads the DLL using MemoryModule library from Github.
The loaded module isn't listed as a module in x64dbg, ...
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148
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How to see parameters in stack in x64dbg like in OllyDbg for known API calls?
Based on Detailed API call descriptions not available in x64dbg
When I debug a known API call like for example WSARecv, in OllyDbg I can nicely see the parameters in the stack:
I've installed both ...
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2
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210
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Malware analysis - Debugger hangs at HttpSendRequestA
I'm reverse engineering a malware that at some point tries to connect to http://api.ipify.org in order to get the IP address of the infected PC.
I was able to replicate this behaviour with a small ...
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2
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1
answer
129
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Understanding the logic behind decompiled code
Hi I was learning reverse engineering by doing some crackme(s) found online using IDA and x64dbg.
I'm quite confused on the below decompiled code.
bool Logic()
{
char CODE[] = "RAND_STRING&...
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4
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1
answer
375
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Change string value when string is in a RAM address x64 c++ program
I'm new to reverse engineering.
I'm simply trying to change the value of a string in x64dbg, of a program I make myself in VS
(It's a c++ program, and is VERY simple; it just prints a string, and two ...
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1
answer
225
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xdbg64 Unable to find string.. Need help cracking a program
Ive been trying to crack my friends program for quite some time. He gave me permission and we are trying to see if his mod menu is ready to hit the market. Ive watched a couple youtube videos and I am ...
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250
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x32dbg error C0000005, EXCEPTION_ACCESS_VIOLATION
Having some trouble with cracking a program, as the software does not prompt me to enter a serial key for activation. Instead, a serial key 924D-E42E-427D is already displayed within the program. So ...
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71
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Problem while debug with x64dbg
I am debugging with x32dbg a program (x) which at some point opens another program (y). Is it possible to continue debugging also on program (y) when opened by the first one (x)?
Unfortunately, ...
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257
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Comparison of Windows Debuggers
I have some experience reverse engineering ELF files using tools like GDB, radare2, and Ghidra, but I am new to Windows debugging. There are quite a few different debuggers out there for Windows and ...
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142
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Exporting patches as loader in x64dbg?
Is there a way to export modifications made in x64dbg as a separate executable file, which can be used to patch a desired executable file without detection?
The resulting file should function as a ...
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1
answer
136
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Anti-patching checksum [closed]
I'm busy with debugging a program in x64dbg and it has some kind of anti-patching mechanism so can someone please advise me on how I would go about finding the functions which are calculating the ...
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150
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How can I set a breakpoint in x64dbg to be triggered when a certain message is logged?
I am debugging a certain program and I need to stop execution when a certain debug message is logged using OutputDebugStringA(). How can I set a breakpoint for this?
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1
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399
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exe file not opening after patching
I hope everyone is well. I'm new here and I'm hope someone can help me with the problem I'm facing.
I've been trying to reverse engineer a program but everytime I change an instruction, not matter how ...
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3
votes
1
answer
174
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How to call Windows console in ASM and printf some values there?
Is there a working way to embed the windows console in disasm code? I tried AllocConsole with GetStdHandle or AttachConsole with PID of an existing console but it didn't work. I have tried printf ...
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3
votes
2
answers
488
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x64dbg: Conditional breakpoint: how to log only if register value has changed?
What i'm trying to achieve is to use a conditional breakpoint, that never actually breaks but logs in x64dbg's console the value of r9 only when it changes, to prevent console cluttering.
But i do not ...
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103
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How to search for a graphical string?
I am trying to search for a string but in my case, that string is not like a normal string but it's a graphical string.
As you have seen, that is not a normal string that can search for but it's a ...
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1
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367
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Instead of doing a (long) analysis of an .exe, can i run that .exe, attach Ida Pro's debugger to it, and get the pseudo code of functions i want?
Basically, I have this 64 bits game.exe file which is about 400mb. It takes about 24 hours to do the analysis of the file in Ida pro 64 bits free version.
Problem is i have to do it again cause there ...
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258
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Find caller function by DLL loading in x64dbg
First of all I'm noob at debugging task and I'm try to self-study to learn how to debug exe using x64dbg.
I have EXE file packed by themida. i bypassed themida packing using themida plugin in x64dbg....
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383
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Anti Dumping Techniques (C++)
how would I go about blocking Memory Dumps by corrupting the PE Header or blocking the Debugger to get an Handle?
I tried this already but it didnt work. Scylla could still dump it fine.
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133
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Find an address of injected code via GetModuleHandleA
I am reversing really old game (20 years old).
l2.exe loads Dsetup.dll Network.dll. (not sure about order)
inside of the Dsetup.dll i found and injection (kind of protection) into module Network.dll. ...
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282
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How would I crack a software that has Xor encryption
So, before you shout at me to go on google I would just like to say I am new to reverse Engineering. Like I have been doing it for a hour. So, I was doing a bunch of crackmes.one using the search all ...
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302
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What is the correct way to load pdb symbols to show the functions by their name instead of their addresses in x64dbg?
I am trying to reverse a portion of a game, that game loads a DLL file called "ddraw.dll".
Most of the DLL file functions don't appear by their names but appear by their addresses
for ...
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3
votes
1
answer
576
views
Locating function parameters in x32dbg
I'm a bit rusty and trying to analyze a piece of code in x32dbg. As follows:
0627BF49 | 8B0B | mov ecx,dword ptr ds:[ebx] |
0627BF4B | 8B85 CCF5FFFF ...
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122
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Copy all ASCII in x64db
How i can copy all ASCII or Hex values starting from specific point without scrolling up or keep moving the mouse?
For example from below point till first offset.
Thanks
2
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1
answer
422
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Trying to learn more about unpacking
I am working on getting better with concepts of unpacking manually to get more clarity on understanding packing routines and decryption logic, so I am trying a few tutorials on PESpin! Previously I ...
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2
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497
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How to reverse a game and inject a dll in client program?
I am trying to make a bot for a game. But when I open the game in debugger like Ollydbg or in x64dbg the game simply closes and also it doesn't appears in the Attach to the process list in File menu ...
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66
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analyze track program protected
What are the modern methods of dealing with obfuscation and code virtualization? all these protectors create unrealistic code traces?
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1k
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How to locate a string in memory with x64dbg
I opened a 32-bit program with x32dbg, I wrote something on a text box like this :
How can I find the piece of code that manipulates the string "Goku" ? I searched all string references but ...
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vote
1
answer
196
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Calling function with string as parameter
I'm trying to call a function in a game that makes my character sending a message.
I already called a few functions in this game but this one has a tricky parameter.
The function signature should be ...
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163
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How to find the first function that sets the value currently stored in a given register?
I'm interested in a general approach to the following problem:
The function F_Init allocates a byte buffer called Buffer with a size called BufSize. The Buffer is allocated with each frame/iteration ...
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3
votes
1
answer
686
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x64dbg: is there a way to save the complete disassembly of a module to a text file?
Is it possible to save the complete disassembly / listing to a file, and if so, how can it be done?
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votes
1
answer
3k
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How to load a PDB file into x64dbg?
I want to see symbols in the disassembly wherever possible, and I have a PDB file for the .exe I'm debugging, but I can't find a way to load the PDB file from disk. Is it even possible?
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1
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313
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x64dbg : TraceInto only in user code
The question seems pretty simple, but I can't achieve this simple thing in a reasonable time. I have a malware proceeding to deobfuscate a large amount of APIs in memory. Only the pointer to the ...
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1
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411
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Searching for strings only partially works in x64Dbg
Please note that I am new to x64dbg.
As you can be seen in the picture below, the error message has the string
[ebp+8]:L"The information you have entered is invalid!\n..."
However, when I ...
1
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0
answers
313
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x64dbg placing a on write breakpoint on a dynamic allocated address
I am currently trying to reverse the registration scheme of a crackme. I found the jump instruction that decides if the title of the program says “registered” or “unregistered” by simply searching for ...
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992
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How to navigate Disassembly view to specific absolute address location?
I have an absolute address that I want to scroll the Disassembly to in order to see which instructions are at that address. I understand that I can scroll by hand, or I can edit RIP. But the former ...
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