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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questions
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Is decompilation significantly more limited when performed on handwritten assembly?
I understand C language decompilers are designed to decompile code produced by a C compiler, and that such decompilers have a lot of limitations and sometimes are actually wrong (though I don't ...
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23 views
Is there a way to get Ghidra to show the result of an integer division function (div_t) returned in a register more sensibly?
The program I am reverse engineering has a function which I have identified as the C standard div function div_t div(int, int). The div_t result is returned in two ARM registers, r0 for the quotient ...
2
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0answers
57 views
How can I extract working files (in the form of graphics) from these MZP executables?
There's a 1999 PC/Mac game that I'm hoping to extract assets from. All game data appears to be stored in various files with the extension .rsc. I've been able to extract all the game's audio from the ...
2
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0answers
78 views
How to decompile python ELF file (Compiled with Nuitka)?
I have some files that compiled with nuitka. formats are .bin. I could get shell access to running process with pyrasite same as this guide. but I cannot decompile function codes or anything else, and ...
0
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2answers
116 views
convert code to python
i have snippet code that i want to convert to python to understand the types that ghidra use such *(byte *) and *(code *) and *(uchar *) etc..
the first code:
void one(int param_1,int param_2) {
int ...
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0answers
45 views
How to retrieve the encryption key from a dll file?
I have a dll file that makes an http post request to a webserver , request looks something like this :
UmdUsFrEB3wGMuuAz1Znywuedx6+...
0
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0answers
103 views
How do I decode or decompile this class It seems codes are encrypted?
I've used JD-Gui, Luyten and other couple of Java Decompilers but it's not working what is the problem in here? Thanks! It's A Mod (Minecraft) and I'm porting into different versions.
Code:
public ...
1
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1answer
70 views
Decompilation of CIL code into some high level code - do I need to introduce new variables during data flow analysis?
I'm writing a compiler from .NET CIL code to some high level language. Process is similar to decompilation. I have done some control flow analysis - detecting loops, ifs, and so on. In terms of data ...
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2answers
57 views
what does an integer modulus 32 cast to (byte *) points to?
As part of a CTF challenge I have to understand the inner workings of a cryptlock type malware, and use it to decrypt a file containing the flag.
I used GHIDRA to decompile the binary.
The encryption ...
0
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1answer
220 views
Modifying program using IDA/Hexrays decompilation pseudocode
A bit long-winded, apologies in advance. Updates to the question are at the end.
I'm experimenting with hooking functions in a program & modifying them based on the decompilation pseudocode from ...
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50 views
Change PHP Function behaviour on a encrypted file
I have a PHP file that is encrypted with Ioncube. Searching on the internet I found one guy which has decoded it, but when I run the decoded file, the code behavior changes so I can't replace the ...
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1answer
59 views
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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1answer
100 views
What are the way I can reverse engineer an obfuscated C++ program?
I am reverse engineering an program. I encountered a problem where I can't reverse engineer it as the program code is obfuscated. I realised the program is obfuscated thanks to my friend who noticed ...
3
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1answer
90 views
Specifying the register value which is constant for all the functions
In the firmwares I met the situation when some register value is set at startup, and then it's implicitly used as a base address to access the variables.
e.g. register r13 is set to 0x40000000 which ...
0
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0answers
28 views
IDA Pro having issue decompiling gcc compiled ELF64 function with more than one leave/ret
I am new to IDA Pro and am not familiar with anything beyond default settings for decompilation. I have an ELF64 kernel module compiled with gcc and, in several cases, IDA Pro's decompilation is ...
0
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1answer
33 views
How to force a program to run as monothread for dynamic analysis?
I'm reversing a program with x64dbg and ida (I switched from ghidra), hence disassembled and decompiled, I need to understand what is happening with dynamic analysis, but I have a tricky part where ...
0
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1answer
71 views
How to export arm64 and x86-64 binary into one?
I am trying to export a binary that contains both AARCH64-64 and x86-64 in Ghidra. I only opened the x86-64 counterpart to perform some changes.
When I tried to export it, it exported a .bin file that ...
0
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1answer
41 views
Reverse engineering mode X VGA function(s)
I'm trying to reverse engineer an old DOS game. At the moment I'm stuck at a function that implements some functionality of VGA running in mode X. My issue is that any of the available sample codes on ...
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28 views
Ghidra SDK Register TypeFlags are not populated
I am using the Ghidra P-Code in a Ghidra script and I am looking for an architecture-independent way to decide if a register used in a P-Code Op is the Stack or the Base Pointer (basically making the ...
2
votes
1answer
67 views
Can obfuscation be applied on certain parts?
I am newbie to this field. I am still learning from your wonderful contributions, help and guidance.
I have had an app that i want to study in-depth. How the the it is constructed? What components ...
1
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1answer
73 views
Converting a data address offset to the equivalent struct in a C++ module
I have an offset to a property within a player class that I need to access data from. It's made of a specific struct that I have already assembled. IDA reports the accessing offset as so:
v32 = ( v3 + ...
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2answers
606 views
Modifying UnityPlayer.dll with dnSpy or other
I've been looking into reverse engineering a game developped with Unity 2017.4.10, to find a way to get a freely controlled camera. I found the values that interest me in Managed/Assembly-CSharp.dll ...
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1answer
926 views
How can I modify or decompile Hermes JS bytecode?
Since React Native 0.60.4 developers can opt-in to use the Hermes JS Engine. This generates an index.android.bundle binary that contains Hermes JS bytecode.
The Hermes documentation mentions hbcdump ...
0
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1answer
36 views
LPC2378FBD144 Arm7 hex file
I have binary file for the LPC2378FBD144 processor ineed to reverse engineer it using IDA V7.3
im little confused about memory organization values i should put in the memory organization thank you for ...
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1answer
124 views
Why does decompiling a C++ using Snowman yield some full variable names and some obfuscated ones?
I decompiled a C++ exe file using Snowman, hoping to see if it was malware or not (Although, honestly, I have no clue how to continue that - The file is really large, and the decompilation mostly ...
2
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0answers
108 views
Accessing Windows 10 Feedback Hub Data
I'm trying to make a website that displays the feedback from the Windows 10 Feedback Hub but i have met a roadblock. I'm using Fiddler 4 (Fiddler Everywhere doesn't have support for UWP yet and ...
3
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2answers
154 views
How can I get xrefs to class member variables in IDA?
I'm working on a decompilation of a windows PE (with its full debug symbols in a PDB) and I'm using IDA to help with it.
I want to know how I can get a list of all references to a given class member ...
2
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1answer
117 views
How to reverse engineer cx_Freeze exe's?
How to reverse engineer Python scripts turned into binaries with cx_Freeze?
0
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1answer
86 views
Converting rep movsd to to C without memcpy
So I am currently in the stages of creating binexact version of functions in decompiled code. I noticed that in this function the rep movsd is called and logically this is translated as Qmemcpy/memcpy ...
0
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1answer
59 views
Custom IDA Decompilation Format
Is there a way to customize the format of IDA's decompiled code?
e.g.
char buf[7]; // [rsp+5h] [rbp-1Fh]
to
char buf[ 7 ]; // [ rsp + 5h ] [ rbp - 1Fh ]
or
switch (c)
to
switch( c )
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1answer
101 views
Can you decompile code if you Know the Complier?
My company has a small number of .exe that were written in the '80s that are performing some minorly important tasks. Source code is gone and documentation is scarce. In order to run them we need to ...
3
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2answers
225 views
How to show KUSER_SHARED_DATA members in decompiled C code?
Here is a sample C code which prints Windows version directly from address
of KUSER_SHARED_DATA. Tested in Windows 10 only. The raw memory address
differ in Windows version but that's not the point.
#...
0
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1answer
106 views
How to inform Hex-Rays decompiler (7.0) of known register values?
I'm currently working on a binary that has encrypted strings, using IDA 7.0. The encrypted data is copied to another location in memory, which is then decrypted. I have already decrypted the strings ...
0
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1answer
325 views
Extract PYZ Error
I successfully recovered some PYC files from an ELF built by PyInstaller (https://github.com/extremecoders-re/pyinstxtractor/wiki/Extracting-Linux-ELF-binaries). There is a PYZ archive in the dump. I ...
0
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0answers
61 views
Volatile data Ghidra
Is it possible to set a local stack variable volatile? I'm trying to reverse a program full of concurrent threads which exploit this mechanism: https://en.wikipedia.org/wiki/Setcontext to obfuscate ...
3
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0answers
154 views
Legality of publishing decompiled code
The situation is the following:
Binary file of a computer game from the 1980s. The binary file ran on a platform that doesn't exist anymore (not x86).
The binary file does not contain any symbols or ...
0
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1answer
50 views
Understanding how a WiFi camera app goes from packet data to video stream
I have a WiFi webcam that I'm trying to get to stream to my computer. I'm able to get the camera to send data to my computer, but I don't know how to decode it. The data consists of 11 1450 byte ...
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1answer
173 views
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 ...
0
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1answer
94 views
How do i identify parameters function of md5sum of specific binary?
So, i downloaded the binary. Here are some details before moving forward:
revbinary: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2,...
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2answers
189 views
STL Data Structures Hex-Rays
We all know that reversing STL code is no fun. To make it easier, I usually create some of the strucutres so I can reference the created STL structures in another custom structure.
For example, msvc - ...
0
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1answer
49 views
Any ways to combine Android APK with Expansion pack file?
I want to have only one APK that contains all files and resources without having to download expansion pack every time.
Is there any way to combine Android APK with Expansion pack file?
My expansion ...
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2answers
110 views
How would I start to decode this? Asking for help from a friend (Alien Hominid Invasion)
I have literally no idea how to start to decode this kind of a file, but I really want these fonts and a decoder would be huge for the community, so any help would be great. Linked below is a google ...
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1answer
80 views
Is decompilation easier or generally more accurate for smaller ISAs?
I am wondering if decompilation would be easier for an ISA with fewer instructions. For example, RISC-V vs x86.
0
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2answers
129 views
Is manually converting/decompiling x86 source code to C/C++/etc… considered reverse engineering?
I have the source code of an old program written in 32-bit x86 assembler that I am working on manually rewriting in C.
The first time someone asked me about this project I told them I was 'reverse ...
0
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1answer
297 views
How to make Ghidra recognize bit fields?
Suppose we have the following C source:
typedef struct {
int bit0 : 1;
int bit1 : 1;
int bit2 : 1;
int bit3 : 1;
} bit_struct;
bit_struct a;
void setBit3()
{
a.bit3 = 1;
}
When we compile ...
2
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0answers
70 views
Ghidra is mishandling a field access
I have a program which decompiles in Ghidra to include the line
temp_5f2f2f81bc = *(CPedIntelligence **)(&DAT_000010c0 + (longlong)pCVar2);
temp_5f2f2f81bc is a CPedIntelligence*. pCVar2 is a ...
2
votes
1answer
229 views
How do we decompile java so easy?
I have seen a lot of videos where everyone is decompiling the jar files so easily. but I learnt that we cannot decompile any compiled file so easily. I have a little bit of experience in Gidhra. I ...
1
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2answers
596 views
Batch decompile using IDA Pro 7.5
I am trying to batch disassemble and decompile 500 binaries using the IDA Pro 7.5 disassember and Hex rays decompiler. I can get the .i64 output from the disassembler, but I do not have a way to batch ...
5
votes
2answers
324 views
What kind of function creates this code pattern?
Apologies if this is a duplicate. Don't know what words to search for as that's what the question is about.
I'm relatively new to reverse engineering binaries and while using Ghidra I've noticed that ...
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1answer
122 views
How can I analyze this code? [closed]
I wanted to analyse the code for some functionality.
in my understanding the code contains a logic handling intents with extras. I want to know how these Works! and also how can I pass extras using ...
