Questions tagged [x64dbg]

An open-source x64/x32 debugger for windows with UI inspired by OllyDbg.

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x64dbg Lock Memory Address w/ a Value

In cheat-engine, there is a way to 'lock a memory address', where if anything tried to change it -- it will change it back to the value you locked it with. Does anyone know of a way, or plugin that ...
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35 views

Calling/debugging calls to DLL via ollydbg or x64dbg

I have used dependency walker on a DLL of an old game from 2001. I have found a function which I want to be able to analyze. I see the name of the function and the entry point (at the end). How do I ...
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35 views

String as constant , even not visible in disassembler

I was reading this article Where I saw that while reversing the WinRAR I saw that the x64dbg is not able to search for a string in all modules "evaluation copy". but why is that happening. ...
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27 views

How to calculate value inside stack segment (SS)

I have an assembly row which the following information: EBP = 006FFB50 SS = 002B When I looked on this row: mov eax,dword ptr ss:[ebp+8] I assumed that EBP + 8 = 006FFB50 + 8 = 006FFB58. But ...
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29 views

How to view the functions of a loaded library in x64dbg

I am working on a packed file with UPX. In one of the lines it calls to the value of the address 0xF5222C which is: 0x778057c0. The debugger auto-completes it to kernel32.LoadLibraryA. Where can I ...
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34 views

What's the reason for a program to crash every time a breakpoint is set in x64dbg?

I know this question may be an ambiguous one and so may not be straightforward, so I apologize for that. Nevertheless, I believe that anti-debugging is responsible for the constant crashing of the ...
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49 views

Relative/absolute addressing; RVA, ASLR, the relocation table and patching instructions

I've been trying to learn reverse-engineering for fun, cracking my own dummy games and whatnot and I just learned ASLR is a thing. I'm now trying to re-conceptualize everything I've read so far ...
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49 views

x64dbg execute till next call OR return

I am using x64dbg and I want to know if there's any way to run the code till next Call statement? I know there is an "Execute till return" option, but I want to execute till next call ...
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39 views

How can I easily convert little endian pointers in hex dumps?

I am tracking down a data structure whose address is inside the second operand: mov rcx, qword ptr ss:[rbp+E0] When I look at the value of [rbp+E0] I see the following dump: 21 C4 FC 5E 00 00 00 00 ...
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25 views

Set a breakpoint for a win command without an address

How to make these columns empty or make a new breakpoint where they are empty? I just need a stop at these win commands (in the summary column), not at a specific address. I don't know what exactly ...
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28 views

How to whitelist an address for breakpoint?

If I have breakpoint on some win function, how to whitelist some address on which I don't want stopping? Seems that it is needed to use conditions. How? I use x64dbg, but if you only know a way in ...
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40 views

x64dbg break when hex string is loaded

I'm trying to break execution when a string is loaded in memory. I can´t find the string by using the search for -> string references So I press Alt + M and press Ctrl + B to search my string ...
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29 views

Debug x64dbgpy scripts in vscode?

i've tried to debug a x64dbgpy script using ptvsd and vscode. don't ask me how, but i was able to break into the script using a "remote python attach" session, setting breakpoints and stepping into ...
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1answer
74 views

x64dbg, breakpoint on write in memory with specific value

In x64dbg, we can set hardware breakpoint on write in memory dump but can we add more codition? Ex. Set breakpoin on write of value of 2F.
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1answer
107 views

x64dbg throwing exception

I have been working on finding an overflow in wordpad and i was able to run an exception with an undefined behavior (my point of view). I am using x64dbg (I am not a pro x64dbg) and it shows ...
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2answers
229 views

Dealing with obfuscated PUSH PUSH RET instructions

I wanted to run an app on a VM but there are PUSH PUSH RETs stopping me from looking at their anti VM code. There is a messagebox when I run it on a VM. I set a breakpoint at MessageBoxA and it gets ...
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81 views

How to log CPU instructions executed by program with x64dbg?

How to log CPU instructions executed by program with x64dbg? I saw x64dbg - see the current position? question, but I can't find the way to log instructions. Thanks!
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1answer
61 views

How's this code able to make use of the stack?

I am trying to reverse engineer software to extend its functionality as expected of me. So I don't have the source code with me. Anyways, I am used to seeing codes that start like the one below, and ...
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1answer
261 views

Debug and crack .NET executable PE

First of all, i'm trying to learn reverse engineering for testing my codes and that's all and i'm not stupid enough to do illegal things with my knowledge so please don't give me legal advises. I'm ...
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95 views

Recommended plugins for x64dbg

I was wondering, as professional reverse engineers - what would be your "must-have" plug ins? Please give a brief description and say how it helps you and possible drawbacks. The more you can ...
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41 views

x64dbg call function from current thread

While debugging an executable with x64dbg, I want to make a function call (while the executable is stopped on a breakpoint), what I want to do is the same as the following gdb line: p (void*)freopen("...
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85 views

Patching memory

I've successfully reversed and patched an application on windows, but patching the executable on disk triggers a CRC check and prevents it from loading. I've used x64dbg and have the addresses I need (...
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49 views

How to display the addresses rather than the labels in x64dbg?

By default, it shows addresses as labels when it can. (call <JMP.&printf>). However, I need it show the actual address itself in the disassembly view. I have looked all around in the GUI, ...
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33 views

How to ret with jxx in x64dbg's sciprt

main: call foo call bar ret foo: // code cmp $number, 0 je ret // code ret bar: // code cmp $number, 0 je ret // code ret I would like to ...
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37 views

Finding out what creates FIFA RTWC 98's main window

I am currently familiarizing myself with x64dbg as a tool for reverse engineering. As an exercise, I challenged myself to try and patch FIFA RTWC 98's executable to force it to run on a windowed mode. ...
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50 views

Tracing back the user code section that triggered a message

I have a Windows GUI x86 executable and I have identified, in the .rsrc section, where the error string I want to trace is. Let's assume it is in id=83Ah. I have set a bpx user32:LoadStringA and then ...
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63 views

Reversing WSASend finding functions that called it

I'm trying to make my first DLL calling game functions What I need is tracing functions that call WSASend, so it will be easy for me to get all functions address to call them from my DLL. What I ...
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2answers
97 views

Function Prologue, add esp directive

I need to see how a DLL was written and I am using a x32dbg to do it at run-time. I am a newbie to this reversing stuff, so I am confused with this piece of code: push ebp ;...
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1answer
91 views

I can't set a hardware breakpoint on RIP + N-byte after calling NtContinue()

#include <Windows.h> int handle_exception (EXCEPTION_POINTERS *exception_pointers) { exception_pointers->ContextRecord->Rip += 4; return EXCEPTION_CONTINUE_EXECUTION; } int main (...
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1answer
440 views

Reverse engineer Listen to this device on Windows - Reverse engineer Windows when there's no API

I'm writing an Autohotkey script to toggle Listen to this device for my microphone, without interacting with a GUI. I thought it would be a simple registry key being modified so I used RegShot to ...
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1answer
73 views

xor eax,3 why does the input change the way it does?

I am new to reverse engineering and I am trying to figure out exactly what xor is doing in this little program. I know if I put any number other than 0 I get a xor eax,3 so if I put in 1 I get 2 if I ...
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89 views

About x64dbg find command + Help to unpack a program

The find command in x64dbg(x86), (found here: https://help.x64dbg.com/en/latest/commands/searching/find.html) doesn't return anything. For example: findall 0x00524180, "E8 ????????" returns 50 ...
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89 views

Patched Application causes Acces Violation c0000005

I've been working with this application to remove it's trial limitations. But every byte I change, it throws an acces violation. Piece of the code: Original: 003354C6 - 0F85 D3000000 - jne ...
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153 views

x64dbg “Use Graph command or menu action to draw control flow graph here…”

When I press "G" in the CPU view of the debugger I often get the following screen: In what cases can this error message happen? Obviously I can't yet give an exact way to reproduce it, I'm curios ...
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1answer
79 views

Dump array of char* ASCII text to file? (ollydbg or x32dbg)

This question is similar to: List arrays (de-reference pointers) in Ollydbg I have an array of pointers that point to character arrays. I followed the above link and can view the ASCII values from ...
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349 views

unpacking Armadillo-packed exe on Windows 10

I was trying to unpack the Armadillo-protected target from this webpage Armadillo 4.30a with Debug Blocker - manually unpacking on Windows 10. However, I got another child process spawning again after ...
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28 views

What is the “Thread XXXX Stack” Section in x64dbg memory map?

So I am trying to understand how an Aegis Packed Malware works, and from what I am seeing the executable is passing the control to a section labelled Thread 2380 Stack after the EntryPoint. This ...
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2answers
179 views

How to compare two different executions of the same file?

When i start the program by just double clicking the .exe, it has a certain behavior. This behavior differs when i start the program from running the launcher provided. I’d like to figure out how to ...
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1answer
201 views

change compare function in assembly and .exe stopped working x64dbg

I'm trying to bypass (crack) a very old software that require license in order to unlock all the features i was digging in the lines with a little bit of knowledge in assembly and i found the line ...
2
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1answer
252 views

bypass license of very old software, Access violation (C0000005) x32dbg

I'm trying to bypass the license of a very old software that i was using many years ago, now, the company of that software is closed and i can't get a license so, with a little bit of knowledge in ...
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1answer
138 views

Nop the string in online games

So i found a string "RespawnTime" in online games and i just edit the string to nop and it worked perfectly, my player is no more waiting to respawn My question is how is that possible? I just edit ...
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1answer
371 views

x64dbg: break when a register contains a value

Is there a way to break code execution when a register contains a particular value with x64dbg? I'm not talking about setting a conditional breakpoint at a specific location, but about watching the ...
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1answer
99 views

x64dbgpy: application unresponsive when trying to automate inside breakpoint callback

When a breakpoint callback is triggered trying to automate the debugger inside the callback causes the application to become unresponsive. x64dbg continues functioning but the application itself doesn'...
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1answer
761 views

How to use memory address information from IDAFree to set a breakpoint in x32dbg?

I have a DLL paused at EntryPoint in x32dbg. I am interested in examining memory following a specific API call that this DLL makes. I found the API call in the imports section when I open the DLL in ...
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2answers
317 views

What's ScyllaHide's PDBReaderx64.exe Doing?

I just downloaded the binary of ScyllaHide for x64dbg. According to the instructions, I need to generate an NtApiCollection.ini file by running PDBReaderx64.exe or PDBReaderx86.exe. But I've got a ...
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195 views

X32DBG ignores dependent DLL

I have EXE file which calls one specific DLL among other system DLLs. When I change a string value in this specific DLL I can see the changes when I execute the EXE file. For example I can change text ...
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105 views

Detailed API call descriptions not available in x64dbg

I am following a RE tutorial, and the guy is using Ollydbg while I use x64dbg... and I don't find all the descriptions in that Olly has, and it's quite annoying ! There is an example from the two ...
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1answer
257 views

cannot find a string in x64dbg even when using search all strings

I am trying to debug a program for testing but for some reason i can NOT find any strings related to registeration like Registered, Unregistered,Blocked in x64dbg, i can see all these strings in the ...
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1answer
118 views

How can I navigate to the Disassembly address location?

I'm using x32dbg and I've set a hardware memory breakpoint. It triggers successfully for a specified module and the debugger pauses and a message on the bottom says: Hardware breakpoint (byte, read/...
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2answers
153 views

Find a instruction in a binary file (PE) based on a virtual address of a string reference

English is not my first language, so I'm sorry if my text isn't so clear. I'm trying to program an automatic patcher for a PE binary that should work for multiple versions of this executable. For ...