Questions tagged [x64dbg]
An open-source x64/x32 debugger for windows with UI inspired by OllyDbg.
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1answer
78 views
x64dbg how to set conditional breakpoint on WinAPI function
I am trying to solve a GUI based crackme. https://crackmes.one/crackme/5c68758633c5d4776a837cc4 so that I learn security. I want to set a conditional Break point on user32.CallWindowProcA. Microsoft ...
0
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0answers
51 views
Trace back function call
I'm learning reverse engineering and I'm trying to find where an error message is called.
I want to get in the part of the code, in the main module, where it decides to display the error message or ...
2
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1answer
129 views
Reverse engineering file format - ImageLink
I have some technical documentation which is supplied in the form of a generic Windows viewer and a database. The database contains different "books", which are represented by a bunch files:
book.bbi ...
0
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1answer
127 views
x64dbg - Locating where data is initially written
I am hoping someone can help me with a question or two.
Essentially I used to be a computer programmer who always wanted to get into a bit of game hacking, having not done any serious programming for ...
0
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1answer
178 views
Go back to the function call address
My question is simple : When I enter into a function call, I can't go back to this same call. Is there a functionality which could permit me to do this in x64dbg?
Or for example if we want to trace ...
0
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2answers
74 views
Print opcodes in trace - x64dbg
How can I print the opcodes in a trace log?
I can use {x:bswap([cip])} but this will print a fix amount of bytes (which most of the time will end up as either more or less number of bytes), ...
0
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1answer
166 views
Debugger always paused in ntdll.Kifastsystemcallret
I am using x32dbg to debug a program. I want to find the line which corresponds to a pop up message in my program to put a Break point.
But everytime that I set "Pause" after the pop up window's ...
0
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1answer
155 views
x64dbg - Conditional breakpoint based on function argument
How can I set a conditional breakpoint based on the argument of a function?
I am trying to break on the windows function LoadLibraryExW: https://docs.microsoft.com/en-us/windows/desktop/api/...
0
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1answer
74 views
The callstack does not show the message handler
After clicking a button or doing anything which might generate a message to be translated and dispatched, why is that the callstack might not show the message handler?
Say I am reversing an ...
1
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1answer
77 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?
0
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1answer
53 views
x64dbg “System” meaning
I'm a bit confused about what "system" refers to when looking at the callstack in x64dbg. Does it mean the code is currently being executed in ring0? I thought that only system calls are executed in ...
2
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1answer
64 views
dongle check happen before a debugger start debugging
i'm trying to fake the test ( dongle exist )
but one problem that i encounter is that the application detect it before i start debugging it .
this is what happen with more details : open( not ...
2
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1answer
129 views
How to save (trace) the execution route/sequences in debugger and Replay?
is it possible to save the step-by-step execution route of the program?
i.e. lets say in x64dbg the program executes one handle after another
and so on, probably hundreds of calls...
But according ...
0
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1answer
121 views
How to locate an specific data structure in an executable?
I need to locate an specific "struct" variable in the data section from an assembly. This structure is used for an specific System Function (Windows) "SetCommState()". I'm wondering how to locate the ...
7
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3answers
3k 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 ...
1
vote
1answer
143 views
Run any line/command in x64dbg
Is it possible, to run whichever line I want?
For example, if it is at black position, and i want to run the RED CIRCLED command:
I couldn't find a way to do that, neither in right click or etc......
1
vote
1answer
311 views
x64dbg how to watch all changes after one step
We know that x64dbg will mark the changes as red color after we step an assembly instruction, so how can I get all changes without scroll monitor windows?
x64dbg 32bit version trace:
NEW UPDATE
...
2
votes
1answer
252 views
What's the fastest way to set a breakpoint when a value I know gets written in memory, if the memory address is different each time due to ASLR?
I have a 64bit exe I'm debugging with x64dbg.
I'm searching for a specfic string value myvalue that sits encrypted somewhere in the exe (so, searching for myvalue at the beginning returns nothing).
...
0
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2answers
212 views
.exe file to .class, decompiled to .java, how to put back to .class?
I'm trying to reverse engineer a very complex .exe to alter its behavior.
Ran JWScan that tells me it's been wrapped with Jar2Exe (which I also saw during debugging).
Looking at the complex exe with ...
1
vote
0answers
649 views
How to step to specific function call?
I'm reverse engineering an application and I identified a specific function call that has an output that I need to capture. For the actual capture, I'll do a memory dump, so that I can handle. However,...
2
votes
1answer
132 views
Debug a windows service entry without windbg
An answer to a similar question here mentions that the entry of a windows service can be patched to allow attaching a debugger (in my case x64dbg). Google searches on the topic are all related to ...
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2answers
814 views
Automating bypassing anti-debug checks
I'm working on bypassing the anti-debug checks of an unpacker in x64dbg. My end goal is to bypass all of the checks so that I can run the (unmodified) process with a debugger attached without any ...
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2answers
140 views
How to reach functions triggered by non-standard buttons?
I've already read related posts such as:
link1: https://stackoverflow.com/questions/24138087/how-can-i-set-a-breakpoint-for-a-button-click-using-ollydbg
link2: How can I set a breakpoint for a button ...
1
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0answers
62 views
x64dbg flow-indent style trace logs
I have recently been using x64dbg a lot. I am coming from using tools like dtrace and frida-trace on macOS. Is there any way to get flow-indent style trace logs in x64dbg? Or would you recommend a ...
2
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1answer
173 views
Does x64dbg display the whole memory info even for a simple program opened?
I'm very new in software reverse engineering. I created a very simple c program using Visual Studio and the code is listed below.
#include <stdio.h>
void main()
{
int x, y, z;
while(...
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2answers
784 views
Comparison between orginal and modified DLL files with x64dbg
Is it possible to find the modifications between a original DLL file and a modified one using x64dbg?
And, if I can't do it with x64dbg, what tool would be better than a debugger to find the ...
1
vote
1answer
310 views
Outputting a patched DLL from x64dbg
I've been working on reversing an extremely outdated piece of software that I happen to need in order to get at the information stored in some equally outdated "database" files.
Using x64dbg, I've ...
2
votes
0answers
124 views
How to solve anti-patch protection involving NtContinue? [duplicate]
I'm having an issue when trying to patch an application. If I open the .exe application with x64dbg, it first goes through ntdll.dll and then runs the application module. It works fine as long as I ...
4
votes
1answer
280 views
Search strings in multiple files/processes/modules (x64dbg)
when you click String references in x64dbg, it only lists strings from current module/file. Is that possible to search strings in multiple (selected) files/modules?
3
votes
1answer
296 views
x64dbg - see the current position?
i.e. when the program is running, and x64dbg is attached to the process - how can i see where it is at this moment?
3
votes
1answer
151 views
Unable to use CreateRemoteThread in target process
I'm trying to get a debugger attached to a malware, but it seems to pick up whenever a new remote thread is created (which makes it so I can't use Scyllahide).
Even if I suspend all threads, it does ...
2
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1answer
87 views
Forcefully interpret code in x64dbg
I was just wondering if there was a way to force an interpretation of a block of code in x64dbg.
The section im analyzing fluctuates between this:
and this:
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2answers
4k views
How to view string references?
I have attached debugger to process/application (exe), but when i go to string references, it shows ntdll.dll references, instead of program.
how to get the references from program itself?
is it ...
4
votes
1answer
1k views
How to copy binary file with x64dbg\x32dbg after it changed it self
I know how to do it with OllyDbg but with x64dbg\x32dbg I don't know how to do it.
I have a packed binary file and at some point it unpacks itself and I found the point where it does it.
I want to ...
0
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1answer
2k views
How can i add plugins in x64dbg?
I am trying to add 'xAnalyzer' plugin into it but after copying the files, I can't see it in debugger.
Its installation instructions are not working.
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0answers
120 views
Failed to set breakpoint (Anti-debug protection)
Sorry for my bad English in advance.
There is a program that has some protection. The problem is I can not set hardware and software breakpoints in x64dbg (to be more precise - not everywhere), cuz ...
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vote
2answers
350 views
FThunks when trying to get IAT
Pretty new to RE so sorry if this is a dumb question.
I'm trying to manually unpack an executable and I believe I've found the OEP. However, when I use Scylla to try to fix the import table of the ...
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vote
1answer
260 views
identifying function prototype from dll
I have an exe file and a dll file. This exe file uses the dll to decode input file. This exe file is gui based and does not support command line execution.
So my requirement is to create a program ...
0
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1answer
403 views
x64Dbg view jumps to selected command
I've poked around the settings for x64dbg and never managed to find this. I was just wondering if there was an option for x64dbg similar to ollydbg's "show jumps to selected command":
Thanks all
3
votes
1answer
1k views
Trace back which function called the message box in x64dbg?
I have an error message pop up on the screen every few seconds on a program.
I would like to trace it back as to which function is calling the message box and why.
I found the referenced string but ...
-1
votes
1answer
790 views
VMProtect keygen, turn off the anti-debugging
who faced with VMProtect? I just found on the Internet crackme and decided to grunt it, but unfortunately not that good of it did not work out, as the message about prevention of debugging climbed out....
0
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1answer
242 views
Is there a way to see all “values” in memory?
In a program I'm working on, a variable is set using a memory address:
mov r9, [0x0000000000472C10]
Is this the equivalent? (forgive the python code):
value = 55 <---- value at memory address ...
0
votes
1answer
463 views
Run program until completion without debugging step by step [closed]
I am debugging a program but I no longer want to run step by step. Is there no "resume program" function that I can use to let the program I'm attached to, to run to completion of all its tasks ...
1
vote
1answer
394 views
Is it possible to set breakpoints relatively to the memory block in x64dbg or a similar debugger?
Some of my breakpoints perfectly survive multiple restarts.
But many interesting parts of the code I am debugging have different locations in memory after a restart. It seems the reason is, that the ...
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0answers
520 views
Tracing function calls in x64dbg
I'm new with x64dbg and want to know if there is any way to get the trace of a functions inside a module?
I've used trace over option, but basically it just traces all the insturctions but doesn't "...
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1answer
144 views
What are modern techniques of reverse engineering? [closed]
I read an article on x64dbg blog(https://x64dbg.com/blog/2016/07/09/introducing-contemporary-reverse-engineering-technique-to-real-world-use.html) which mentions modern techniques of reverse ...
6
votes
1answer
522 views
How does this EB F2 x86 instruction work?
In the following code snippet, the EB F2 instruction is causing execution to jump back up to the line indicated by the arrow. How is this the case given that there is no address supplied to EB and the ...
2
votes
2answers
556 views
Record all calls to specific function? Olly/x64dbg
I need to find values of arguments that are passed to specific function.
Normally I set INT3 breakpoint and check registers and the stack whenever it is reached. But there is too many calls to this ...
0
votes
1answer
662 views
How can I define a struct in x64/x32Dbg?
See the image how there is ecx, ecx+4, ecx+8, ecx+24, etc... What if this is a struct and I want to define it... Can I do this in x64Dbg and if so, how? I do see a Struct tab in the hex dump area, but ...
2
votes
1answer
993 views
Dealing with exceptions in x64dbg
I'm debugging a game and I often come across an exception (EXCEPTION_PRIV_INSTRUCTION)
The debugger pauses on the address where it stops, now I want to step over one command at a time but when I step ...
