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Questions tagged [decompilation]

Process of translating assembly code extracted from a binary file in a structured programming language, such as C.

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71 votes
7 answers
143k views

What are the possibilities for reverse engineering an IPA file to its source?

I browsed a lot, but can't find any resources for reverse engineering an IPA file (iPhone application). Is there any method to reverse engineer an IPA file to its source? I've tried to rename it to ...
BlueBerry - Vignesh4303's user avatar
63 votes
7 answers
135k views

What is a good Java decompiler and deobfuscator?

I am using JD-GUI to decompile Java JAR files, but the problem is that it leaves many errors, such as duplicate variables which I have to fix myself and check to see if the program still works (if I ...
43 votes
3 answers
28k views

Unpacking binaries in a generic way

I find that more and more often binaries are being packed with exe protectors such as upx, aspack etc. I tried to follow a few tutorials on how to unpack them but the examples are often quite easy ...
Remko's user avatar
  • 3,273
42 votes
8 answers
82k views

Is there any way to decompile a .NET assembly or program?

Are there any tools available to take an already compiled .dll or .exe file that you know was compiled from C# or Visual Basic and obtain the original source code from it?
APerson's user avatar
  • 927
42 votes
1 answer
94k views

Decompiling iPhone App

I've been searching this site and more, but I haven't had much luck. I want to decompile an app to see how part of it works, and I've tried multiple programs. I've tried Hopper, IDA, and some other ...
user94584392's user avatar
37 votes
3 answers
32k views

How do I figure out what is burned on an Arduino ROM?

I have an Arduino Uno Rev3. I would like to extract and find out what code is burned on the ROM of the micro-controller board. How do I extract the code from the board? How do I figure out the ...
asheeshr's user avatar
  • 2,465
33 votes
5 answers
30k views

Open source GUI tool for decomposing a PDF

I've been looking for an open-source GUI tool to extract PDF's in an automated way on Windows systems. I've used Didier Steven's tools with great interest for a while, but cannot make sense of how to ...
Lizz's user avatar
  • 443
32 votes
4 answers
12k views

Why are machine code decompilers less capable than for example those for the CLR and JVM?

Java and .NET decompilers can (usually) produce an almost perfect source code, often very close to the original. Why can't the same be done for the native code? I tried a few but they either don't ...
Rolf Rolles's user avatar
  • 9,198
31 votes
6 answers
13k views

Decompiling Android application

The Android java code is compiled into Dalvik byte code, which is quite readable. I wonder, is it possible in theory and in practice to write a decompilation software for Dalvik byte code?
Mellowcandle's user avatar
  • 4,825
27 votes
7 answers
96k views

Decompiling .pyc files

Does anybody have a suggestion for (non commercial) software to decompile "byte-code" Python (.pyc) files? Everything I've found seems to break...
Carlos Garcia's user avatar
20 votes
1 answer
8k views

What is the state of art in LLVM IR decompilation?

LLVM IR is a fairly high-level, typed bitcode which can be directly executed by LLVM and compiled to JIT on the fly. It would not surprise me if a new executable format or programming language was ...
nneonneo's user avatar
  • 1,283
19 votes
4 answers
15k views

Checking if an .exe is actually a .jar wrapped in an .exe

Let's say I have a .jar file and wrap it into a .exe using any number of free utilities out there, like JSmooth. Would it be possible to tell, given just the .exe, if it was generated using one such ...
APerson's user avatar
  • 927
18 votes
4 answers
179k views

Converting assembly code to c

I have the following assembly code over Linux distro: # using the .data section for write permission # instead of .text section .section .data .globl _start _start: # displaying some characters ...
MLSC's user avatar
  • 331
16 votes
4 answers
5k views

How to recover variables from an assembly code?

Assuming we have an assembly code, what are the known techniques that could be used to recover the variables used in the original high-level code ? Edit: By recovering variables, I do not mean ...
perror's user avatar
  • 19.1k
16 votes
6 answers
15k views

Decompilation techniques for DOS .COM files

I've found a binary copy of a DOS freeware game I was fond of back in the day (Firefighter, downloadable as FIRE.COM) but the source code is not available. I'd like to re-implement it in C or Python ...
ESR's user avatar
  • 161
15 votes
3 answers
39k views

Reverse engineering a Visual Basic p-code binary

p-code is the intermediate code that was used in Visual Basic (before .NET). I would like to know where I can find resources/tools related to analysis of these virtual machine codes.
viv's user avatar
  • 784
15 votes
3 answers
68k views

How to decompile Linux .so library files from a MS-Windows OS?

I would like to decompile the Linux .so files. Any tool to decompile .so files in MS-Windows based operating system ? Any tools/methods to decompile .so files ?
BlueBerry - Vignesh4303's user avatar
13 votes
4 answers
30k views

Recovering .NET sources into full blown project

I wonder if total decompilation of arbitrary non packed project .NET is possible? If no, what is the conditions that should be met to make it possible? If yes, is there tools that can automate this? I'...
see ya's user avatar
  • 823
13 votes
1 answer
8k views

concat22 in ghidra decompiler

Some portion of code I am analyzing gets decompiled as below in ghidra: if (((*puVar8 == CONCAT22(DAT_0040a37a,DAT_0040a378)) && (*(uint *)((int)puVar9 + 6) == (CONCAT22(...
Gaurav Sehgal's user avatar
12 votes
3 answers
9k views

Reverse engineer an old DOS QBasic executable

I recently decided to try my hand at reverse engineer an old DOS text based game that was coded in QBasic. I found some info online about old DOS games disassembly but mostly for Wacom compiled C/C++ ...
ricardojoaoreis's user avatar
12 votes
1 answer
3k views

Delphi Pascal Try..Except..Finally block

I'm having trouble reverse-engineering a specific Delphi Pascal .exe (old vsn., pre-1995 so probably v.3). From the system calls I understand this is probably a try..except..finally block, but I am at ...
Jongware's user avatar
  • 2,364
12 votes
1 answer
11k views

Where can I find tools for reverse engineering Lua

Since Lua is an interpreted/compiled language that its own compilers and isn't usually translated/compiled with a C compiler. What tools should be used to reverse engineer an application written in ...
cb88's user avatar
  • 2,330
11 votes
3 answers
111k views

How to obtain x86-64 pseudocode in IDA Pro?

Does anyone know about obtaining pseudocode for x86-64 in IDA Pro? I already tried the Hex-Rays plugin to obtain pseudocode, but when I try it, the following error pops up: "only 32bit code is ...
john's user avatar
  • 119
11 votes
4 answers
19k views

How to decompile a C# .exe on macOS?

It this even possible? Are there any free tools?
ttt's user avatar
  • 227
11 votes
3 answers
21k views

How to decompile an Objective-C static library (for iOS)?

I'm trying to use IDA Pro v6.5 (freeware) (demo) to decompile an objective-c library compiled for ARM7-7S. I tried Hopper v2.8.8 (freeware) with no success. I had no problem until I tried to display ...
kl94's user avatar
  • 213
11 votes
2 answers
1k views

Is there a collaborative reversing forum for people that deal with firmware?

The question pretty much says it. Beyond knowing people that are interested in the same things, is there a collaborative reversing dumping ground for documenting specifically disassembly of closed ...
RobotHumans's user avatar
11 votes
1 answer
6k views

Are the EU laws preventing reverse engineering of software products?

Would it be legal to decompile and/or reverse engineer a commercial java JAR file to view the inner workings of a library in order to write original code for use with the library in the EU or UK?
Jesson Atherton's user avatar
11 votes
2 answers
10k views

Decompile and recompile C?

What tools produce C code that does not produce errors when you try to recompile it again? Can Hex-Rays decompiler convert everything to project files in a single folder and just compile it?
user8005's user avatar
  • 151
10 votes
9 answers
9k views

Is it "theoretically" possible/impossible to reverse any binary?

I know that reverse engineering from binary to source code (e.g. C++) is generally considered hard or impossible but has any computer scientist actually proven "mathematically" that it's impossible or ...
Mark's user avatar
  • 253
10 votes
3 answers
18k views

Reverse engineer Android native code

I am looking for an reverse engineering tool or a way to decompile the existing android native code to an human understandable format rather than Assembly language. Can anyone please suggest me as i ...
msk's user avatar
  • 109
10 votes
3 answers
4k views

Can you decompile Actionscript 3 on a Mac?

Reverse engineering SWFs with ActionScript 3 on a Mac typically requires a Windows VM and a lot of copying and pasting. There are some good decompilers for Windows such as as3extractor but I haven't ...
Jay's user avatar
  • 101
10 votes
2 answers
8k views

How to load symbols from a symbol server in Ghidra?

I've been trying to learn Ghidra by attempting to reverse the comctl32.dll system library, which has many of its functions documented. I started the de-compilation analysis in it, and after a while it ...
c00000fd's user avatar
  • 1,691
10 votes
4 answers
17k views

AirPlay Mirroring decryption (FairPlay)

I've been spending a good chunk of time looking at some 3rd party applications that were successful in "reproducing" (although I believe not necessarily by understanding the algorithm completely but ...
Roberto Andrade's user avatar
10 votes
1 answer
6k views

Can I define custom enum-type to be used in Ghidra as a data type?

I'm trying to learn Ghidra. Say, if it generated the following code for loading functions from an array of function names from gpfnCommCtrlAPI: I was able to retype gpfnCommCtrlAPI into char*[14] ...
c00000fd's user avatar
  • 1,691
9 votes
3 answers
23k views

Get jar back from wrapped(into exe) jar

Is there any way to get a jar file from a jar wrapped using a exe wrapper. I have an exe file and I know that it was wrapper using exe wrapper (launch4j to be precise). How do I unwrap this jar to get ...
meain's user avatar
  • 243
9 votes
1 answer
1k views

Becoming A Better Reverse Engineer

I have been looking on the net and all I see when it comes to reverse engineering are a bunch of silly crackme tutorials. I want to be better at taking code from assembly to c or c++. I am getting the ...
LUser's user avatar
  • 793
9 votes
1 answer
543 views

How to convert this one-liner asm to C

I want to convert this to C: SHR CL,1 rECX is the name of the (32bit unsigned int)register variable. It should be simple, but I can't figure out the proper pointer magic :/
user3590's user avatar
  • 101
9 votes
2 answers
11k views

How to extract functions from one executable to include/link in another

I'm wondering what are the options (aside from attempting disassembly/decompilation and reassembly/recompilation) one has when it comes to extracting a series of functions from one binary, compiled ...
Roberto Andrade's user avatar
9 votes
3 answers
598 views

How to differentiate from different hex files of different families of microcontrollers?

Is there any way to differentiate different microcontroller's hex files? I have a hex file and now I have forgotten of which micro-controller it belongs. Is there any available tool to tell this? or ...
Abdul Rehman's user avatar
9 votes
2 answers
384 views

Decompiling return-oriented programs

How are return-oriented programs decompiled/reverse engineered ? Any pointers to any papers or reports would be appreciated.
debray's user avatar
  • 668
9 votes
1 answer
972 views

Decompile "Internal Call"

I have a .NET method which is marked as an "Internal Call", meaning that it is implemented within the CLR itself. Is there any way to locate the code for and/or decompile such a method?
Levi Botelho's user avatar
9 votes
1 answer
4k views

Decompiling an executable compiled by vercel/pkg

I have a .exe file that I am trying to get the source code of, After some digging I figured out that it's in node.js and was compiled using vercel/pkg I tried using pkg-unpacker however the output is ...
Anon's user avatar
  • 91
8 votes
5 answers
1k views

Is it possible to hide the details of which compiler was used?

The compiler adds system information to the output/object file that is created on compilation. Is there any compiler option that can prevent this information from being added? Can the compiler ...
asheeshr's user avatar
  • 2,465
8 votes
1 answer
1k views

How do you optimise AST's or convert them to a real language

I have been interested in automatic vulnerability assessment and decompilation of code for a while now. And as a result I have been building parsers in Python that reads a bin, disassembles it ...
Stolas's user avatar
  • 2,331
8 votes
2 answers
4k views

How to retrieve native asm code from .NET mixed mode dll file?

This is seriously one question I couldn't find the answer to anywhere on Google.com When I mean mixed mode I mean .NET application which has unmanaged and managed code together. I used tools .NET ...
SSpoke's user avatar
  • 759
8 votes
2 answers
3k views

How to deal with Static Memory Allocation while modifying an executable?

I'm not new to StackExchange, but I'm quite new to reverse engineering, so please be patient with me! :P At present I'm dealing with an executable that I would like to modify a little bit, for ...
Zarathos's user avatar
  • 185
8 votes
2 answers
1k views

IL for decompiler to human-readable format

After writing my own disassembler, I am now looking to making its assembly listing more human readable, e.g. from an (artificial) example push ebp mov ebp, esp sub esp, 10h mov eax, ...
Jongware's user avatar
  • 2,364
8 votes
1 answer
5k views

Understanding __PAIR__ macro from IDA PRO Pseudo Decompiler to look better

When I decompile using IDA PRO I get code which could look like both of these Understanding the __PAIR__ macro. Macro itself. // The following definition is not quite correct because it always ...
user3435580's user avatar
8 votes
0 answers
717 views

How do I reverse this firmware? 8-bit handheld console

I recently bought this chinese console that supposedly has 328 8-bit games. I want to understand the code and how it works to hack it and maybe load other ROMs. It has a chip covered in black epoxy ...
Lorenzo Ivan's user avatar

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