Questions tagged [debugging]

Process of analyzing live programs through software (e.g. ptrace) or hardware (e.g. JTAGs) devices.

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103 views

Why eax is assigned to 'variable looked' like addresses

#include <stdio.h> int main() { int number1, number2, sum; printf("Enter two integers: "); scanf("%d %d", &number1, &number2); sum = number1 + ...
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2answers
95 views

How to test and debug x86 Assembly exceptions in NASM?

I have seen all the exception "IDs" in the Intel Manuals, and just came across sandpile's exception guide, which actually shows some hexcodes. For example, "divide by zero error": ...
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1answer
467 views

Debug 3rd-party apk with .so-files missing debug symbols

Apologies, if this has been asked before. I am reverse engineering a chinese app that connects to a BLE device, so I can inspect how it transmits the data. Using this official guide I decompiled my ...
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1answer
272 views

How to debug an application (exe) freeze and crash?

I have an app (and I don't know the source code), that freeze and crash everytime it loses focus (but the music continue). I've tried to debug it using windbg but it doesn't change anything, and I don'...
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QEMU with GDB: Stepping Instruction causes Windows VM BSOD

I'm currently analyzing a piece of software inside a Windows 10 QEMU virtual machine which is connected to a remote GDB debugger. I have set breakpoints to audit what the application is doing. I have ...
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1answer
502 views

With ghidra/x64dbg sync, how to display dynamic values in ghidra's decompile window?

I'm reversing a program and a library without debugging symbols. I'm using x64dbg to break at specific regions and observe what is happening at runtime, and annotate the decompile version in ghidra. I'...
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1answer
197 views

WinDBG Hung on Shellcode Execution

I've been trying to debug a piece of simple shellcode with Windbg. To go over the steps I took, I allocated a buffer for the shellcode with .foreach /pS 5 ( register { .dvalloc 400 } ) { r @$t0 = ...
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1answer
196 views

The Knowledge of Compiler for becoming a good Reverser

I just reached the the topic of Compilers in the book "Reversing:Secrets of Reverse Engineering" So, I want to ask, is the knowledge of Compilers necessary for becoming a Malware Reverse ...
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1answer
261 views

How to let SIGTRAP get caught by sighandler in GDB?

I have a program that I am trying to reverse, which contains an int3 (0xCC) which emits a SIGTRAP signal, which is then handled by a sighandler defined in sigaction. The handler performs calculations ...
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3answers
213 views

Where Can I Get .PDB files for Windows OS Components?

I want to take a look at some components of the Windows OS in IDA, such as ntoskrnl.exe and some of the Windows API .DLLs. I understand there is a Microsoft symbol server, but I am not sure how to ...
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1answer
58 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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59 views

How to use aarch64 call convention to understand an unknown function?

I’m trying to reverse engineer an aarch64 Golang binary which happens to call a symbol, i.e., function named guess_me which is an import. To stop the binary from throwing errors, I write a Hello World!...
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1answer
110 views

how can ı debug encrypted dll with x32dbg and look getregistery request

I have an executable with 2 .dll calls 1 of this dll is guard.dll others name is guardlib.dll both of them is encrypted c++ library file and they are called before executable entry point. I can bypass ...
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325 views

Remote Debugging an Aarch64 ELF File on Multiarch/Qemu-user-static (arm64v8/alpine) Docker Container

My goal is stated in the title. However, I think there is a fundamental issue with gdbserver. In particular, I create an aarch64 alpine docker container on a x86_64 Ubuntu 16.04 host using sudo docker ...
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1answer
233 views

Analyse structure from memory dump

I'm trying to extract master key from OpenSSL 1.0.2l (statically linked without debug symbols). I'm using x64dbg, I was able to locate int SSL_connect(SSL *s) method, so I have a breakpoint there (the ...
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0answers
53 views

Use IDAPython to automatically attach to a remote GDB server

I would like to automate the process of connecting to a remote debug server. The following code worked for the remote win32 debugger: from ida_dbg import * set_remote_debugger(addr, port) ...
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104 views

How to debug a shared library with radare2?

I am currently trying to pick up radare2 but I am struggling on a little hurdle.. I am given a shared library, let's call it shared.so. I managed to perform some static analysis using $ r2 shared.so ...
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1answer
703 views

How can I debug Ghidra plugin Python scripts in IDE?

I'd like to debug Ghidra plugin scripts written in python using an IDE such as Eclipse. I have installed Pydev and the GhidraDev plugin (from Ghidra open a script in Eclipse to autoinstall the plugin)...
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0answers
91 views

Dynamic Analysis with gdb on ELF binaries with no compilation/linking information

I am trying to do some dynamic analysis on a couple of ELF binaries with gdb. However, since those two are directly downloaded (ELF binary file only) with no additional information related to ...
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3answers
289 views

How to find the address (offset) of specific driver function

I am reversing Capcom driver and in IDA I have this list of functions: I want to set breakpoint on the function sub_10590 but I don't know what is the address of this function when I am doing live ...
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1answer
41 views

How to run a process with high privileges using remote debugging

I am using remote debugging with IDA. The target and host machine are Windows. I can run the process on the remote machine and debug it with IDA using remote debugging but I need that the process will ...
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38 views

Radare2: Running executable from a specific point

I am using radare2 to reverse engineer a standard crackme executable. I have obtained the password, but now I need use the program to read & print a restricted file to which the executable has ...
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1answer
736 views

How to open new window of decompiler or resize the decompiler of Ghidra?

This is very small and inconvenient to read. How do i open new Window (any shortcut key) or resize it, for some reason i cant resize. Any help? EDIT: Oh thanks Shane Riley, i clicked the blue button ...
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1answer
31 views

are address for instructions specified during compilation?

when following certain youtube tutorials, the address in memory for the instructions are same in my machine and the youtuber's machine. How is that possible? Are instructions provided with memory ...
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0answers
56 views

Ways of creating a new thread on Windows

I'd like to know about every possible way how a thread can be created in a process at the lowest possible level. There are loads of WinAPI-s to create a thread, but as far as I know all of them ends ...
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1answer
86 views

Append to environment variable in LLDB

It is relatively easy to set environment variables in LLDB, via settings set target.env-vars DEBUG=1 However, I can't seem to find a way to append to an environment variable. The following doesn't ...
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93 views

capture traffic of an android app

I was trying to test and intercept traffic from an app developed on Rhodes open source framework, I setup a proxy with burp, and of course I have installed burp certificate on my device hence I can ...
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1answer
314 views

Can I force GDB breakpoints and disassemble?

Sorry English isn't my first language. I noticed something when setting breakpoints in GDB. It appears that they are ignored if symbols aren't loaded. I have found it weird how GDB behaves when there ...
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1answer
114 views

Rust string capacity lower than string lenght

According to RUST documentation, strings are stored this way : This is a statement I can verify while reversing rust binaries. The thing is that when I am reversing rust binaries, I likely encounter ...
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1answer
98 views

How can I modify these?

So I'm onto something interesting, I asked the less direct way but failed to meet the requirements in terms of explanation So here it is, how would I go about editing these the same way I would go ...
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0answers
50 views

Change value of memory in a debugger?

So I got this app loaded in x64, there is a function, let's say "HeatGainedPerShot", which is basically the value which an object gains everytime it fires, Such a value would normally exist ...
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233 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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0answers
89 views

How to find and edit the source of a string in a DX11 game's exe/files (debug build of the game available)

I want to find and edit the values for the motion blur effect in Naruto: Ultimate Ninja Storm 3 on PC (Windows, DX11) to be more in line with the PS3 version (and the other Storm games on PC as well). ...
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0answers
374 views

Instruction trace using frida in android emulator

i have a emulator named "Ldplayer" in my windows os and I'm trying to log all instructions executed by the app that uses ARM JNI libraries. basically, the app is running in an x86 emulator ...
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1answer
98 views

Debugging Encrypted Malware with Multiple Threads

What is the best approach when debugging a multithreaded program that is yet to be encrypted? Where is the best place to put Breakpoints using Ollydbg?
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1answer
135 views

Bypassing IsDebuggerPresent [closed]

I am currently trying to attach a debugger to a program with a callback for IsDebuggerPresent. Normally, i would patch the program to pass over this check, but patching the program is not an option. ...
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0answers
72 views

pick dump from a specific process from virtualbox coredump

i'm interested in reverse engineering and assembly stuff i have started to do some research and im still a complete beginner what i have learned so far that we could use virtualbox to dump the RAM ...
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0answers
114 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 ...
2
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1answer
342 views

How to debugging activeX with Ida

When I enter to some site it ask me to install ActivX to my Internet Explorer browser so this site will work well. I installed that,and that site works well. How can I see this ActiveX code(where ...
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2answers
120 views

How to retrieve name of a variable defined in the data segment in IDA when no process is attached?

I have disassembled an old DOS application with IDA. It run in 16-bit real mode. Some instructions are referencing variables defined in the data segment (DS). push word ptr ds:8401h Since I have ...
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32 views

Is it posible to break at string when it being use by program?

Like the title, i need to break at an url string when it being used by program. I try memory break point but it will break at begin of the section. I use x64dbg.
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1answer
76 views

How can I find the function that throws an error message in IDA Pro? [closed]

Let's suppose I want to use IDA Pro to debug a Windows PE64 application that always throws an error message at a specific point when being run. What steps would I have to take to find the specific ...
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0answers
95 views

PE Explorer vs. Debugger differences

I injected shellcode into an executable. Entrypoint is set to first shellcode instruction. Shellcode: nop nop label: nop nop jmp label nopnop which translate to: \x90\x90\x90\x90\xeb\xfc\x90\x90 ...
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1answer
557 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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1answer
130 views

Construct a number from 0-999.9 using 5 data bytes of a MIDI SysEx message

I'm sending MIDI messages to a proprietary turntable that has an LCD screen on it. The normal software sends out updates via MIDI SysEx to display the current tempo on the LCD. The MIDI is being ...
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2answers
417 views

How to setup VSCode with IDAPython?

Is it possible to remotely debug IDAPyhton scripts using VSCode and ptvsd? I found a few tutorials on the net, but no one is working. In the past, using the same protocol I was able to connect to Maya ...
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0answers
126 views

Display open handle ids in IDA Pro

Is there a way to display all the open handles of a process in IDA Pro while debugging it? I'm debugging a 64-bit binary on Windows OS with the win64_remotex64.exe as the debugging server. I want to ...
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1answer
2k views

Debug and crack .NET executable PE

i'm trying to learn reverse engineering for penetration testing my codes and i believe i won't learn unless i can do some practical so I'm trying to crack an application that is written in C# and all ...
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0answers
232 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
79 views

Is it possible to view PE headers in xdbg just like ollydbg?

In ollydbg you can view the PE header of a module, by going into memory map and double clicking on the PE headers, but i couldn't find a way to do this in XDBG, is it possible?

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