Questions tagged [decompilation]
Process of translating assembly code extracted from a binary file in a structured programming language, such as C.
470
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How to exclude "Process Monitor" from Themida's list of monitoring programs
Can Themida be made to whitelist a particular program of its list of "monitoring programs", whether through reversing or compile-flags?
I want to exclude Sysinternals "Process Monitor&...
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1
answer
102
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i need software to decode this subtitle xml file, anyone know what it encodes with?
This is a subtitle file encoded by xml, is there any way to decode this xml file to srt?
Subtitle link xml
1
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0
answers
132
views
Ghidra: undefined4 to bytearray
I am trying to reverse a c++ program and make the decompiler represent a byte-array in a single line.
The c++ code contains the following line:
BYTE fileArray[139] = {0x50, 0x51....}
Ghidra ...
0
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1
answer
97
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Trying to reverse encypter to decrytper in C. Can't figure out what I'm missing
Goal:
Trying to reverse encrypter to decrypter that successfully decrypts.
This is the pseudo-code of the disassembled encrypting program. There are no function calls, and I've been able to somewhat ...
-3
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1
answer
553
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Is it possible to decompile ex5? What are some hints in how one would do so?
I am creating an expert advisor. I am wondering how people can decompile the ex5 to mq5 for meta trader. Does anyone have any insight on this?
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ELF - Why does objdump provide a wrong byte value in the .got?
I seriously can't tell if I'm misunderstanding something grossly or if this is a bug in objdump. Newbie alert.
$ objdump -s --start-address=0x3fc0 --stop-address=0x3fc1 test
test: file format ...
2
votes
1
answer
110
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How to define a 28-bit integer in Ghidra
I'm working on reverse-engineering firmware for an STM32G0B1, which has two onboard CAN modules, in Ghidra.
I think that a proper data structure for both the Tx and Rx FIFO buffers would help me ...
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What are some methods to reverse a ex5 file for metatrader 5?
What are some methods to reverse a ex5 file, for metatrader 5? I would like to understand how people crack ex5 files and make them for use. Any ideas of reverse engineering tools for this scenario?
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How to find where an instance variable of some object is set to some concrete value?
I have a binary which implements license restrictions for concurrent users to a hard-coded value of 4. For various reasons I need to increase that hard-coded value, but am unable to build the app on ...
2
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1
answer
170
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How to map a decompiled c program back into original source code
I developed a program, and sadly I did some updates, compiled it and then lost the updated source code, but I do have the original source code (I think I added like 3 functions in the update).
So is ...
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How to develop an anti-debug library which allow users to debug their own programs but not the library?
I'm going to publish a library which guarded by anti-debug ,(ptrace_trackme for Linux and isDebuggerPresent for windows).
The down side of this library is: users would be abled to debug their own ...
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Need help extracting AP_Pack .obb files
I'm trying to extract the files for the series of 4 games - Sorcery!, which are in the format .obb.
Thanks to a Hex editor I saw that the .obb was an AP_Pack, and looking for more information on the ...
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1
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117
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Replace a function in a Windows 32-bit binary with a custom C function
I am reverse engineering a Windows game from 1995 using Ghidra, and I'm currently documenting all the decompiled functions. My goal is to replace a function in the original binary with a custom C ...
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1
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Stuck decompiling ARM64 function
I am trying to figure out how this function squashes quaternion (double[4], dvar5..6 in the disassembly) data into the 2 int outputs vertexX and vertexY.
As far as I can tell, it reads the raw sensor ...
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168
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IDA Decompiler generates wrong output on array of structures!
There is a structure with size of 16-Bytes, and an array of it is defined.
The disassembly code for navigation through the array is:
MOV i, i,LSL#4
LDR R4, =arr_of_struct
ADD i, i, R4
LDR ...
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2
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How can I disassemble/decompile an immediate value to multiplication/summation of two values with IDA Pro?
Is it possible to force IDA to show "5 * 20" instead of "100" in the below disassembled and decompiled lines?
MOV R1, #100 -> MOV R1, #(5 * 20)
LDR R8, =var | ...
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4
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3
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366
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Help disassembling a simple 16-bit NE function
I am currently attempting to reverse engineer a simple function from within a 16-Bit Windows 3.1 (NE) DLL, which from what I can tell is used to display a message box when required.
I would assume ...
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Santander US - app
I am trying to see the requests of santander us app, but the app in the emulator crashes on open, crashes when using frida, and crashes when I recompile it using apk tool. I also used uber apk signer. ...
2
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0
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439
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Decompiling an APK of Unity framework with IL2CPP
Is it actually possible to decompile the source code from .so files (in this case it's libil2cpp.so) inside the APK of Unity with IL2CPP scripting backed?
I tried stuff like https://github.com/Perfare/...
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1
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Reverse engineering a flutter built apk
I was trying to reverse engineer an apk built with flutter. I actually feel like reversing flutter built apps did not get much reverse writeups on the community. one of the tools for the task ...
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1
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81
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Double constructor when reversing Unity game
When reversing Unity dll, the decompiler (i.e. dnSpy) sometimes would create a class with 2 constructors, which are mostly identical apart from some specific field set / not set.
Here is an example:
...
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Linux Kernel for embedded platform - Available Sources but no configuration
I am trying to recompile the kernel for the Redmi Note 4 (MTK). I have successfully obtained a copy of the stock, pre-compiled kernel, and a variant of sources that seems to coincide quite well with ...
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I trying rewrite asm to c++ [closed]
This code generates an API key. I use it in an android app as .so file,
but I need to rewrite it to java from c++. How do I translate?
push rbp
push r15
push r14
push r13
push r12
push ...
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3
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1
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177
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What tricks can I use to manually decompile a set of instructions
ELF Binary takes user input and stores it in loc.buffer address 0x4020e8. Further, the registers going into the instruction set are
eax
ebx
ecx
edx
esi
length of user input (min length is 3)
0
...
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4
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1
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279
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IDA Pro Flow Chart and Decompiler Doesn't Work on Single Instruction text
Recently I got a program that has two colors of .text segment, one is black and the other is brown:
While the flow chart and the decompiler work well on black part, they are both disabled on the ...
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0
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33
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Is there a way to run arbitrary code on a vtech Nitro Vision?
Note: If this the wrong place to ask the question, please redirect me to the appropriate stack exchange and/or subreddit. I just figured reverse engineering is my best bet since it's kinda what I'm ...
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Find out what is this binary database entry and what format it is
the following varbinary "BUFFER" of a database entry is for an article.
FIELD_0 is in plain text and the item name is "1", which I created with the item management software.
[...
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Which encryption method has been used?
Anyone please can you tell me which method used to encrypt this kind of codes?
im really confused, that would really helps me.
This encrypted data created by a PHP.
Ibª„bÏ}◊Kì-yNî˜>Efi¶ØÁÇ_^§ ...
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1
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78
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How to interpret this __ctype_b based predicate?
I am getting this simplified function from the decomplication results of Ghidra, and I am having a hard time interpreting what the predicate would evaluate to since I do not have access to __ctype_b ...
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342
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How to list all references to memory from selected memory region in ghidra?
I want to find all peripherals used by firmware dumped from embedded device. I loaded SVD file to add registers into memory map. Now I can find a peripheral in the memory region and check if there are ...
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Extracting contents of unknown file format
I would love some help on working with this file format.
I have this archived file from this abandonware game that I like to mess around with, and I have tried all sorts to try and expand it to ...
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1
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Are there websites for reverse engineering challenges similar the programming challenges? [duplicate]
As a developer, reverse engineering has always fascinated me. It amazes me to see what some people can figure out just from a dump of assembly code, and I would like to become better at doing the same....
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2
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Decompiling and Recompiling APK leads to crash using Apktool
Decompiling and recompiling an apk causes it to crash. My goal is simply to insert a method into smali code that prints a stacktrace, but even decompiling and recompiling with no changes causes the ...
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272
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Dumping .NET Dynamic Methods
I have a .NET exe that creates DynamicMethods whose bodies are built from a byte array and later called. I'm able to access the array, and even to disassemble it "raw" starting from the ...
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2
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194
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How to Convert given set of Assembly-Level Instructions to High-Level Language Code?
As I am working on malware analysis, I got stuck in a place where I have to change the given set of assembly-level instructions to high-level code. Example:
Assembly Level Code
mov ebp, esp
...
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1
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0
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101
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IDA Pro maps wrong variable for offset
I hope there is a proper way to fix my issue.
Here's memory layout:
.data:004F3D10 char * * gTownObjNames dd offset aMage ; DATA XREF: townManager::SetupTown(void)+245↑r
.data:004F3D10 ...
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348
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Reverse-engineering a 90s CNC machine (FORTH like) firmware
Here's an undertaking I'm currently in, and would absolutely love someone to assist more directly. I'll list the subjects that I would greatly appreciate more knowledge within. Know anything about one ...
2
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1
answer
2k
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How do I Decompile .Pyd file made with python, cython and pyinstaller 3.6
I created an app in 2018 with python and then used Cython and pyinstaller v 3.6.
I am wondering how to decompile it. I have tried uncompyle6 + pyinstxtractor however this only works for python files,...
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vote
1
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425
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Can I get a valid source code from this assembly?
I've used the IDA 8.0 Demo to retrieve (from a .DLL) the assembly code, such as:
; code
pxor xmm0, xmm0
ucomiss xmm0, xmm1
ja short loc_67F31600
movss xmm2, cs:...
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Decrypting .toc file
So I have a few files from a game on my pc, most of which are .toc files
I believe this means they are a "table of contents" as the ending suggests, but my attempts to read them have been ...
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How to correct decompiled output with `in_stack_` (ppc BE)?
So I have something like:
*************************************************************
* SYS_DRAW_BATCH_RUNS_DATA::Set(matrix4 const*, RECTF con ..
...
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Decompilation output modification in IDA Pro
I am trying to modify cfunc AST from
If (a1 && some_func_ptr) {
some_func_ptr();
}
To
if (a1) {
some_func_ptr();
}
But I constantly get INTERR 50683 error. I tried
new_item = idaapi....
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Crackme assistance - unknown function [closed]
i have a problem about a crackme that my friend sent me for a bet. I solved most of it but i am stuck with this function. I can't even understand what the function is trying to do. Please help.
images ...
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960
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Ida Pro can't decompile big function
I tried to decompile (Pseudocode) a big function into binary with Ida Pro 7.7 but I got error :
The graph is too big (more than 1000 nodes) to be displayed on the screen.
Switching to text mode.
(you ...
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1
answer
457
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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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187
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Python or C for a Qt application and security against reverse engineering
I actually have two choices : C or Python to create my application.
On my application users will need a key (on start) to access it, the key will be verified with an algorythm on the user's computer. ...
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254
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Borland C++ 3.0 - Which code might produce this strangely convoluted ASM sequence?
I'm reverse-engineering a DOS binary that was compiled with Borland C++ 3.0, and I'm trying to create C code that will produce the same assembly as the original when compiled with the same compiler. ...
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768
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STM32 - Disable Voltage Check
I'm planning to edit the binary Firmware for an STM32F030K6T6 ARM microcontroller used in the IKEA Fyrtur blinds. In particular I'm trying to
disable the Voltage check (allow alternative power source)...
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65
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How to utilize `FillOutStructureCmd`?
Basically I'm extending the CreateStructure.java plugin so it iterates all functions and tries to automatically create structures on all variables.
It looks something like this:
public class ...
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