Questions tagged [x64dbg]
An open-source x64/x32 debugger for windows with UI inspired by OllyDbg.
94
questions
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1answer
59 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 ...
0
votes
1answer
49 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'...
0
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1answer
49 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 ...
0
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2answers
59 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 ...
0
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0answers
77 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 ...
1
vote
1answer
71 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 ...
1
vote
1answer
59 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 ...
0
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1answer
74 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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vote
2answers
99 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 ...
3
votes
1answer
133 views
Is it possible to view and modify process memory without attaching the debugger in x64dbg?
This functionality is available in Cheat Engine where the debugger won't be attached until you set a breakpoint or explicitly ask for the debugger to be attached. I've looked everywhere and couldn't ...
0
votes
1answer
39 views
Find Retdec Address Range in x64dbf
How do I find this function from retdec (https://github.com/avast/retdec) in x64dbg?
// Address range: 0x1017dba0 - 0x1017dbda
int32_t function_1017dba0(int32_t * a1) {
int32_t fileHandle = (...
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0answers
76 views
In X64dbg, how can I script a string write to memory?
I find that I can write to memory as
[addr] = value
As given by the documentation at http://help.x64dbg.com/en/latest/introduction/Input.html
And while I could work around my problem as dividing ...
1
vote
2answers
147 views
Difference between 32 bit and 64 bit disassemblers
As far as my level of understanding goes, the only difference between a 32 bit and 64 bit disassembler is that the produced assembler-code of a 32 bit disassembler is only using 32 bit assembly ...
2
votes
1answer
89 views
How to hide a process from all the methods of getting the list of processes?
So it seems that there are a lot of ways of getting the process list, although I'm not sure whether in the low level do they acquire them from same place or not
so these are the ways i know :
...
0
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0answers
58 views
What's the point of changing the CS register and can any process do this?
So i was reading this article :
http://waleedassar.blogspot.com/2012/07/wow64-user-mode-system-calls-hooking.html
which explains the wow64, the part that we do a far jmp and change the CS register ...
1
vote
1answer
61 views
What is the ending bytes in the MOV instruction in 32 bit applications in windows? (B8 mov)
So i just compared NTterminateProcess between 32 and 64 bit version of a program, and the mov instruction which moves the syscall into eax is almost the same, both 5 byte, (both the B8 mov) but the ...
1
vote
1answer
72 views
Getting started with RE, with eventually goal being able to make a keygen [closed]
I want to get started in RE and eventually want to be able to figure out how to calculate a serial from a username/license number from program number, etc... (meaning the software tests the serial ...
1
vote
2answers
128 views
When trying to change command line, received an error: “Could not set command line!”
I download CurrPort program and run it on xdbg64.
I pressed File -> Changed Command line and changed the command line to:
"C:\Users\myusername\Downloads\cport\cports.exe" "/close * * 127.0.0....
1
vote
0answers
42 views
UTF8, UTF16 encoding string search
I want to search for a string written in Georgian from within x64dbg. It shows me spaces except them..
P.S I found this github repository but, I don't know how to install the plugin in the debugger.....
1
vote
1answer
126 views
Finding out what calls win32u.dll functions
There's a button which, when clicked, writes some data to the clipboard.
I'm trying to call the function this button executes using DLL Injection.
I managed to find the function in win32u.dll which ...
0
votes
2answers
237 views
x64dbg (x32dbg) log registers every step like windbg
So I just switched to x64dbg (really using x32 atm) from windbg and so far I like it but the one thing I'm missing is windbg printing all the registers every step in the command window. Anyone know ...
0
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0answers
49 views
x64dbg stops at question marks
I tried to debug an exe file and there are multiple lines with three question marks. When you run the file after a few breaks it will get to the question marks and stop there. On further running you ...
3
votes
1answer
79 views
I am analyzing an exe with x64dbg but I dont see the address 00401000 [closed]
Will every .exe file start from 00401000 or am I wrong assuming such a thing.
Edit: total beginner here.
when the program is first loaded onto x64dbg it immediately goes into a DLL, so I could not ...
1
vote
0answers
71 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 ...
1
vote
0answers
68 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 ...
0
votes
2answers
155 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 ...
0
votes
1answer
61 views
'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?
0
votes
1answer
26 views
Is there a way to export all the strings for a certain module in x64dbg?
I have an encrypted file that I was able to step through the code until that specific DLL file was decrypted in memory and I was able to list all of its strings. It has a ton of them that I would like ...
0
votes
1answer
138 views
Storing a string with with x64dbg
I want to patch a Windows binary (actually an ocx) with x64dbg. More specifically, I want to store a string of 60 bytes and store its address in EAX at a certain point.
Do I just have to add it to a ...
0
votes
1answer
118 views
What does ds mean?
When debugging with x64dbg I sometimes see mov ss:[address] 0xAA, I know that this means: move 0xAA into memory at specified address.
But what does
mov ds:[address] 0xAA
mean?
0
votes
1answer
103 views
What does this function actually do?
I'm taking part in this reverse engineering lab at college and we have this final big homework project. I have a part of the binary that changes it's own asm code by iterating through it's own bytes ...
1
vote
1answer
295 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
votes
1answer
154 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 ...
3
votes
1answer
242 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
votes
1answer
233 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
votes
1answer
451 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
votes
2answers
162 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
votes
1answer
435 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
votes
1answer
541 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
votes
1answer
95 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
vote
1answer
112 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
votes
1answer
67 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
votes
1answer
98 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
votes
1answer
349 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
votes
1answer
138 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
votes
3answers
7k 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
388 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
689 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
360 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
votes
2answers
369 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 ...
