Questions tagged [disassemblers]
A disassembler is a software tool which transforms machine code into a human readable mnemonic representation called assembly language.
144 questions
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how to diassemble an .obj file
I'm new to programming and recently studying an ancient DOS assembly program written for 80186 and assembled with MASM. There are some .obj files that I want to open and take a look. I tried obj2asm....
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Reverse DLL and EXE at the same time?
I started reversing a 32-bit x86 EXE that led me down the path of finding the structure and core functions I needed inside of a DLL. I'm currently using Binary Ninja 3.5 as my disassembler, decompiler,...
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How can I make IDA disassemble in NASM-like syntax instead of MASM-like syntax?
I'm new to reverse engineering, assembly and IDA and I'm learning NASM. Whenever I load an executable (a PE file or an ELF) IDA disassembles it using a MASM-like syntax (it looks to me that it does) ...
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Change code segment with disassemblers like IDA
Do disassemblers like IDA or Ghidra change write rules on code segment of a process to change instructions? For example one can place NOP instead of a function call, so it should have RWX instead only ...
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Angr considers REP instruction as the end of a basic block
I'm developing a python script for angr that has to find all the basic blocks present in each function in a binary. I have noticed that angr splits the basic blocks when it finds a REP instruction, I'...
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IDAPython doesn't recognize function
I'm developing a python script for IDA Pro that analyzes 32 bit PE files containing an anti-disassembly technique, the problem is that the function that contains the technique isn't being listed in ...
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In IDA freeware, how to create a new database in IDC and load a file into it?
I have IDA freeware version 5 and version 8, v5 is running on wine, v8 is directly on kali OS, and I am trying to create an IDC script to generate asm+lst files for all files in a certain folder.
What ...
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Does AnyOne knows how to reverse python file that is encoded into elf binary .cpython-310.so extension? Please Help me Out
Following is the link to the file that I want to reverse. This is the python file that is encoded in cpython or cython and it is now a binary file.
Please help me to decode it as it is very important ...
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Access a XREFs with frida
I have a string which has a XREF to a func. This func changes of address at every updates of the app I am working on. So this string is the only "stable" point I can rely on to access to ...
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Clean Angr disassemble output
I'm developing a python script for Angr that has to print as output something in the form of:
Instruction_disassembled opcode_bytes_of_instruction
This is my python script:
f = open(sys....
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frida hook `loc_*` or `sub_*`
Is it possible to hook a sub_... object in Frida ? I disassembled an arm64 executable, when running the app on my iPhone, I can see a lot of classes also in the disassembled executable, but I can't ...
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Assemby reverse engineering
I'm new to assembly and need some help understanding what this program does. This program takes a username and serial. If the combination is correct, it prints the magic words.
I need to write a ...
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how to find a string in memory having ARM instructions ARDP and LDR?
hello, I disassembled the request sent to the game server, I need to change the symbol, but I don’t know its memory address. Help me understand the ADRP and LDR instructions, I need to understand what ...
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Missing mnemonics '??' in Ghidra Assembly Code
I was just trying to google and search for "??" Ghidra with no luck.
I am trying to understand what the following questions mean in this Binary (meant for SuperH2 SH-2 processor) which is ...
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Capstone not disassembling vpunpcklqdq, vprold, and vshufi32x4
I am trying to disassemble a binary using Capstone. I noticed that there are some instructions that cannot be disassembled, e.g. the vshufi32x4 instruction:
from capstone import *
from capstone.x86 ...
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LG C1 Firmware Flashing/Modifying
I have a new TV that is smart enough to not have options and configuration I can actually use, and worse of all my tv changes all setting like brightness, sharpness, warmth and input setting to what ...
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Wrong access .data segment
Preface
I'm a PHP programmer, in my spare time I've been doing reverse work. Achieved good progress in the analysis game. But there was a big problem on my way. And now, more than ever, i need the ...
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Capstone Disassembler to Extract OpCode from Malware and Benign Executables in C++
The project that I am trying to develop has as a vital component, specifically a machine learning based malware detection system. The way in which I decided to teach the detection system in order to ...
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Disassemble Executable Automatically in C++
I have 2 types of files, namely benign and malware. I would like to build a malware detection system based on the assembly language used by these files, by using machine learning. The language that I ...
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How to locate memory address in register $esp
000011d9 <main>:
11d9: 8d 4c 24 04 lea 0x4(%esp),%ecx
11dd: 83 e4 f0 and $0xfffffff0,%esp
11e0: ff 71 fc push -0x4(%ecx)
11e3: ...
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is there a tool to decompile old exe to C?
I follow the free software implementation of OpenRCT2 from the beggining (when it was in other repository).
And the first commits are a bunch of C files, these files has a lot of asm blocks of code ...
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Is disassembly of standard gcc programs trivial, or just as difficult as video game ROMs?
I am attempting to do some reverse-engineering of ARM binaries, with the ultimate goal of reverse-engineering GBA ROMs. Of course, GBA ROMs contain a mixture of code and data, so a standard ...
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File not want to patch. Radare2
I am learning by doing some cracking in files that i made in C. One of this files is this:
file.c:
#include <stdio.h>
#include <stdlib.h>
int main() {
char s[15] = "...
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Creating table with IDAPython
I'd like to create the table like below, I could not found any clue while googling it.
Is it possible to make table with IDAPython, especially with idaapi.simplecustviewer_t class?
Any advises would ...
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Function Arguments/Name on Radare and IDA
I am starting with reverse engineering and Radare and I'm facing the following problem, on IDA Free I see the following code:
mov ecx, 11h
lea edi, [esp+1208h+StartupInfo]
rep stosd
lea ...
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How to understand the result of disassembling IDA Pro (dll x86_64)
I'm studying the dll that was built for x86_64.
I study where there are links to the function "call_f1_1806F3630" and do not understand three of them. Are these features of OOP? Help me ...
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The method of searching for similar code in a binary file of a new release
Got into the hands of such a task. There are two dlls. As the second file was explained to me (new.dll) this is a new release of the first file (old.dll). Both files are compiled for x64. I need to ...
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How to convert to float
.rdata:00414704 __real@c0800000 dd 0C0800000h
How to convert this value 0C0800000h to float point number?
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Unrecognized function
There is function:
push 65h
push edi
call sub_5D8750
In this case, function takes 65 bytes to be filled with zeros, and edi is memory address starting from which to fill these 65 bytes with ...
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662
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On reverse engineering an udp protocol to control a drone
My goal is to control my drone with my raspberry pi using python and not the app that is being delivered together with it.
First I connected the app to the drone, flew and used aircrack-ng to get the ...
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Not able to understand the C-switch statement in disassembly
While I'm trying to disassemble my own C code I am stuck in a problem of not understanding how this Switch statement is implemented in assembly code. Can anyone please help to figure it out? This the ...
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Is the code like this reverse able? (from Assembly - UnityScript)
i try to reverse this code but cant figure it out what is this number mean or how to call it...
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Why do reversers nowadays reverse engineer using decompilers and not disassemblers?
I see many reverse engineering lessons and every second person does reverse engineer using Ghidra decompiler and not disassembler as both are available in the same platform. I assume that reversing ...
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Disassembler with pixel/bitmap view
I am looking for an ARM disassembler that runs on Linux that has a graphic "pixel" or "bitmap" view like the one shown in the pictures below:
I am reverse engineering some old ...
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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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Virtual functions call asm
It seems to be a virtual function call. How would this code look in a high-level language like C ++?
.text:0053A745 loc_53A745: ; CODE XREF: sub_53A690+CEj
.text:0053A745 ...
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Visual c compiler options
I ask if exist some c compiler option that can "keep" some imformation after compile that can be visible when I disassamble with IDA.
This because I need to find a particular funciton with ...
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IDA pro 7.5 - No previous fonts / color imports
For the past few years I've been using an ida color scheme which I created, that was very easy on my eyes with the previous versions of IDA Pro (<7.0). However, after start using version 7.5 I ...
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Lexer and parser for .asm file produced by objdump
Is there any existing project that parses the x86 disassembly file or .asm produced by the objdump or IDA pro using the lexer and parser library in python or any other programming language?
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IDA/HexRays: how do I retrieve the memory address associated with a given line of decompiled code?
I'm trying to programmatically link decompiled code generated by HexRays with the disassembly code of a given binary by mapping memory addresses between the two. The mapping exists, as I can see view ...
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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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Variable location address
There is variable in data section:
.data:00427000 dword_427000 dd 64h
Base address of code is:
.text:00411000 ; Segment type: Pure code
How to calculate actual address and location in memory of ...
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what means "ilegal use of registers"?
I read pe program using a Pe Reader to view all sections, the .text section starts is "0x0001000":
What is in the pe program reader:
And is this what i see on the debugguer :
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How to determine ARM architecture from the ELF file extracted from the firmware?
I have extracted the ELF file from the flash dump of a printer, I cannot find too much information about the SoC chip on the printer. What's the best practice to determine the ARM architecture (ARMv7-...
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Recognize of data block
Assembler code from data segment:
.data:006A5038 dword_6A5038 dd 0
.data:006A5038
.data:006A503C ; char *off_6A503C
.data:006A503C off_6A503C dd offset aOption0
.data:...
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How do disassemblers work?
I have 2 questions regarding this, but feel free to elaborate more if you want to, I'm really interested in this topic:
Do they really just read byte by byte until they get a valid instruction? How ...
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Are there some assemblers or disassemblers that allow dw/defw etc directives with specified endianness?
I've been working with reverse engineering tape image and disk image formats and the files and filesystems they contain.
It struck me that sometimes there are data fields that are not in the same ...
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Two copies to store values
I have this a piece of code, disassembled DX:
.text:004386D3 push ecx
.text:004386D4 fld1
.text:004386D6 fstp [esp+26Ch+var_26C] ;load 1.0 value ...
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Why there are only 8 hexa memory digits while my RAM is 16G
I'm totally new to reverse engineering, when I start debugging my c program with radare2, and start showing assembly, I found that addresses are only 8 hexa digits, which means 16^8 = 4294967296 ...
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What to do with a text file of disassembly code and binaries?
I am fairly new to software reverse engineering and I'd like to know how proceed with analyzing a program if I have a text file of disassembly code and a bin file of binary data. I understand ...
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