Questions tagged [debuggers]

Debuggers allow the user to view and change the running state of a program.

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24 views

Can't add tracing in IDA, showing it in gray

I added read/write trace to a program. I was able to record the trace with IDA for the first time. When I run it again, it didn't work. I tried to do what I did on the first time, adding the read/...
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37 views

How to search for process by name with WinDBG

I know how to list all the processes in the system by running: 0: kd>dx -r1 Debugger.Sessions[0].Processes OR 0: kd>.tlist But how can I search for a process by name? I tried to use the ...
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27 views

Can't resolve a function from a process module (user32.dll): “Couldn't resolve error at '<module>!<function>'”

I have a WinForm project in C++. I attached a kernel debugger to my VMware machine. I set a breakpoint on the kernel and switched context to my application: 0: kd> !process 0 0 WindowsProject1.exe ...
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Can't debug process with IDA Windbg debugger: “Could not initialize WinDbg engine with error: %1 is not a valid Win32 application”

I tried to debug a C++ that I created but I am getting the following error: I have this C:\Program Files (x86)\Windows Kits\10\Debuggers\x64 in the PATH environment variable (based on this answer), ...
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42 views

Process close when try attach some debugger

I'm begin with reverse engineering, because I want to create some new functions to the "game server". That is, I want to inject(hook dll) in this game. **The source code of project not is ...
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1answer
36 views

Switch between debuggers while paused on a breakpoint

Is it possible to switch between debuggers and preserve where you are paused? Often times I find myself wanting to use a feature from a different debugger while paused in a specific context as each of ...
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1answer
44 views

GDB inserting breakpoint cause Segmentation Fault

I was trying to play around with gdb, and I'm especially interest in seeing how the Procedural Linkage Table(PLT) and the Global Offset Table (GOT) interact with each other. So I set some breakpoints ...
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123 views

x64dbg for linux executables?

Is there a x64dbg for Linux executables? I really love x64dbg, but in a lot of CTF challenges there are Linux executables and not .exe files or .dll files.
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2answers
39 views

Changing page permissions at runtime under a debugger

Does x64dbg or another debugger provide a way to change the page permissions for all mapped pages for a given section at runtime? Perhaps via a plugin?
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1answer
88 views

Program prevents x64dbg from starting or kills it if it's already running. What to do?

I have the following problem with x64dbg. I am trying to debug a x64 PE program with x64dbg on Windows. It looks like the program has some sort of anti-debug protection. I have the following behavior: ...
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44 views

open decompiler view of current module (dll) in dynamic analysis

I have a program (P.exe) with several dependencies (A.dll, B.dll etc). I decompiled and studied B.dll, but at runtime, P.exe is using A.dll. The horizon is updating in ISA view-RIP, but I don't have ...
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48 views

Is it possible for a process to debug itself?

What happens if you try to debug yourself ? I mean, does the process crash ? If it is possible, how would you implement it ? I have tried launching x64dbg and I can't attach to my own x64dbg process. ...
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68 views

x64dbg show some text in Chinese

While debugging some 32-bit file with x32dbg, some of the text appear in Chinese and I don't why. This happened after I moved to a new computer but both of them were Windows 10. In my old computer I ...
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57 views

Unable to debug with Debuggers

I can't debug Screen Recorders on any debugger. I tried every possible way including anti debugging plugins, editing up the instructions but every time I failed. Mostly they land on pushad (which ...
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2answers
100 views

ASM Debuggers that visualize the stack (beginner friendly)

(Cross-posted from Stack Overflow) Are there any debuggers that constantly show a visual of the stack and where everything is within it? For example, taking some random image: I use gdb for most ...
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150 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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197 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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1answer
106 views

Is `movq rax, xmm0` buggy in Radare2?

Why doesn't rax get loaded from xmm0 here? radare2 bug? GitHub issue `movq rax, xmm0` doesn't work in native debugger filed. [0x0003b0e0]> drr role reg value ref ―――――――――――――――――――...
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3answers
302 views

How To Identify Which Process Is Being Written To With WriteProcessMemory?

Basically, I cannot find which process is being written to when WriteProcessMemory is being called. Currently I'm Setting Breakpoints on WriteProcessMemory and OpenProcess. However, the process handle ...
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411 views

Evan's debugger (edb) - Failed to open and attach to process: execv() failed: No such file or directory

Problem: When I try to open an executable (in this case exploit exercises protostar stack0), then the following message appears in a pop-up box: Failed to open and attach to process: execv() failed: ...
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237 views

Using IDA pro 7.2 and android server breakpoints problem

i have been trying to use IDA to make a breakpoints on a 4 byte memory address to find out what arm op code writes to it . yet it fails to set a breakpoint and gives me this message " Xscale support ...
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42 views

IDA's debuggers disappeared

Using IDA 7 I've been debugging a program with remote GDB just fine. Today when I opened the database, most of the debuggers are missing from the list, including GDB. It's only when opening this ...
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Immunity Debuggger Inconsistent Results

Question for people using Immunity Debugger. Just started using Immunity Debugger, using 1.85 on Win 7 Pro. Doing some labs on vulnserver.exe and I am getting inconsistent results from Immunity ...
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754 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 ...
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2answers
701 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 ...
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164 views

Issues with Symbols when running windbg on windows xp sp3

I have been trying to debug a crash using windbg on windows xp sp3. I have been getting the below error while trying to debug. I googled around and found the Microsoft no longer offers symbols exe as ...
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593 views

Ida permission error

I tried debugging an running a program via ida64 and it says permission denied please reopen with elevated permission. I am on a mac please tell me how to fix this
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0answers
153 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.....
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55 views

How to find function called by instantaneous event (like mouse press for exemple)

I'm sorry if my question isn't very clear, I have trouble phrasing it so please bear with me. I was playing around with Cheat Engine lately and found myself in a situation where I needed to find what ...
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1answer
618 views

Remote debugging using IDA, connecting to windbg server (kernel mode)

I do kernel debugging by using a virtual com port. One machine (host) is debugging the other machine. I have a remote machine that has IDA, and I wish to connect to the debugging session in the host ...
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1answer
2k views

How to do debug a running java process in linux?

TLDR I want to do live debugging of a java program on a linux machine, and don't how/what debugger to attach to the JVM to get this done. I expect that this is a well-solved problem, but I lack the ...
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287 views

Advanced Anti-Debugging Techniques

I was wondering what are some advanced AntiDebugging techniques that more advanced than the basic ones like IsDebuggerPresent and CheckRemoteDebuggerPresent?
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150 views

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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146 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
70 views

Logging the Instruction Pointer Register

Is there a tool that logs the value the IP register of a specific process running? I am trying to compare the instruction excution before and after a file modification.
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1answer
278 views

When reopening file lose all information in radare2

I have problem with my radare2, when I try to reopen file in debug mode (ood) my radare loses all informations about that file. any help to avoid this?
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81 views

How to debug programs that load from another one? with radare2/gdb

I'm reversing engendering a plugin. This plugin is loaded into memory by the main program. I disassemble the plugin with radare2 but I don't know how to debug it. I try with gdb but same problem. I ...
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1answer
280 views

Is there watchpoints in radare2?

Is there any way to put breakpoints in radare2 that trigger when an address is read/write? In GDB those are call watchpoints ('rwatch' or 'awatch") I got this from radare2 [0xB7F08810]> !dr? ...
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1answer
2k 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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207 views

Does pwntools provide any Radare2 integration?

I want to use pwntools with Radare2, since this is my debugger of choice. However, I can only find GDB-related library calls in pwntools' documentation (pwnlib.gdb). Anyone with experience in ...
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0answers
75 views

IDA Pro - Remote debugging suse enterpris server 10 (glibc2_10 required)

I have a Suse enterprise server 10 on VMWare. I want to remote debug an application in this VM using IDA pro, I already tried these: Copied linux_server form IDApro into this VM and tried to run it, ...
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1answer
360 views

how watchpoint on register works

GDB has an option to set watchpoint on register*, how does it work ? what happens during context switching ? why the only implementation is for mips ? Is there a way to make it work for lldb also ? *...
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1answer
798 views

How to print eax value with Radare2?

I am solving a crack me challenge but I am stuck. The challenge executes several jne tests. The first test is the simpliest but I don't arrive to print the eax value to know the content of cmp ...
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2answers
889 views

Tricore debugging tools

I am new in the reverse engineering, I have a good experience in programming MCUs like c51 and ARM. Now I would like to learn about Tricore reverse engineering... ECUs mainly. I can obtain the ECU ...
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2answers
663 views

Generate software breakpoint other than int3

Is it possible to generate a software breakpoint other than int3 to be catched by the debugger, like a division by zero for example? If so, I was wondering why debuggers don't support generating ...
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1answer
338 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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4answers
17k views

OllyDbg vs x64dbg - Does OllyDbg have any particular advantage over 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
89 views

Does the Radare Debugger support STABS?

From the wiki on Stabs stabs (sometimes written STABS) is a debugging data format for storing information about computer programs for use by symbolic and source-level debuggers. Does Radare ...
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1answer
2k 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 ...
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1answer
330 views

GDB MI output vs. stdout

I am using GDBs machine interface (mi) to write some simple tracers/loggers. Now I ran into the problem of telling apart GDB output from text the target-program itself wrote to stdout. If I look ...