Questions tagged [decompilation]
Process of translating assembly code extracted from a binary file in a structured programming language, such as C.
417
questions
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2answers
36 views
IDA decompiler syntax: for function int __usercall sub_45BD46@ <eax>(char a1@<bl>, int a2@<esi>, int a3)
I have a function with the following header sub_45BD46@eax(char a1@bl, int a2@esi, int a3), my question is: I am right that sub_45BD46@eax means the result value is in eax?
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31 views
Decompiling a Node.js application compiled with nexe
Someone have sent a Discord token stealer and out of curiosity, I would like to decompile it, just to get some info about the attacker.
Judging by folders created in my user directory, multiple ...
0
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0answers
24 views
Injecting class into the JNIEnv in android jni
void *handle = dlopen("/data/local/tmp/libnative-lib.so", RTLD_LAZY);
if (!handle) {
printf("\nFailed to load library\n");
}
void *offset = dlsym(handle, "...
0
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0answers
21 views
Missing definition of `FuncDefn`
So I used latest (10.0.4) Ghidra to decompile a x86 binary to c file and h header/ then I preprocessed it with the msvc cl compiler but in the result, while parsing it - turns out the typedefs for ...
1
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0answers
40 views
identify the functions of stripped binaries
As far I know that stripped binaries when we decompile it we can't know what most of functions (sub_XXXXXX) really do becuase they are not part of the binary's symbol table, so the names are ...
1
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1answer
63 views
Re-analyse HexRays decompiled output
I have analysed a large library in an older version of IDA and want to upgrade. I have marked lots of functions as "decompiled" and changed their function signatures.
How do I automatically ...
2
votes
1answer
92 views
Useless instructions in a compiled getter
This is the second time I see this kind of function today :
.text:00000000000010B0 sub_10B0 proc near ; CODE XREF: sub_1120:loc_1143↓p
.text:00000000000010B0 lea ...
1
vote
1answer
140 views
Hex-rays decompiler incorrect logic
I'm practicing reverse engineering in IDA and I created an example application in Visual C++ to practice working with classes/structs and the decompiler output seems to be incorrect - I would like to ...
5
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1answer
1k views
Decompile a NodeJS compiled program maybe by NEXE
I recently got idiotly scammed one of my discord account but kept the malware in case.
Curious, I would love today to break into the executable to fetch any information about the scammer.
I decompiled ...
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0answers
69 views
The way to determine how the decompiled constructor is structured
I have the following constructor decompiled by Ghidra, i.e. Game. I know some of the functions, which are part of that constructor. And thus I have created my interpretation of that structure. But I ...
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0answers
30 views
What is the correct argument for the disassembled function / constructor?
I have the following code disassembled by Ghidra. It first initialises the local variable of the particular type (local_68) and then passes it to the constructor. The variable seems to be initialised ...
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3answers
127 views
x64dbg Crash on Dynamic Debugging Remove Anti-Debugging Protection
I am trying to run Dynamic code analysis using x64dbg for Windows 64 bit executable. I install the anti-debugging plugin for x64dbg from https://github.com/x64dbg/ScyllaHide. I still find the ...
0
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0answers
28 views
Decompiled VB 6.0 Application Call Statement
I decompiled a VB application using VB Decompiler pro. It contains the following call statements:
Call {EEF18FCD-D67D-4E3C-AA21EC9AF56F90E9}.Method_arg_B8 (global_248, CStr(var_98))
Can you please ...
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vote
1answer
25 views
Is there a way to find the implementation of methods with MethodImplOptions.InternalCall attribute?
Background:
The Unity engine provides a number of PlayerPrefs.SetXxx functions that can be used to save user data. However, it will automatically append a hash to the name of what you saved. For ...
1
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1answer
154 views
How to find offset to a function address from the base address in decompiled image (IDA or Ghidra)
Let's say there is a default base address for the application image on both IDA and Ghidra and it is equal to 140 000 000.
If the function address is: 140 039 ea0
Does it mean that the offset from the ...
0
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0answers
63 views
Procyon vs CFR for Java Decompiler
I'm trying to find the best Java class decompiler thats the most reliable. What's the difference between Procyon and CFR as far as decompiling the most classes sucessfully?
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1answer
194 views
convert C++ code to python code
while I'm doing RE using ghidra i saw this code
byte bVar1;
byte bVar2;
uint uVar3;
uVar3 = 0;
while (bVar2 = (byte)uVar3, (char)bVar2 < '\b') {
bVar1 = *(byte *)(uVar3 + param_1) ^...
0
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2answers
70 views
why does dalvik remove invocations during optimisation?
This is original smali code of a classes.dex method before installation
.method public static createAutoMatchCriteria(IIJ)Landroid/os/Bundle;
.registers 6
new-instance v0, Landroid/os/Bundle;
...
0
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1answer
83 views
How to make sense of the pointer in reversed function call?
I have the code below, derived from the reversed function in the original application:
gladius::world::World::create(*(gladius::world::World**)(*(char*)(this + 0x5e8) + 0x50));
The create function ...
0
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0answers
36 views
Baksmali services.odex from Android L (5.1, API22)
I'm trying to deodex a system file (/system/framework/arm/services.odex) as I need to modify it.
I've tried every possible commands found online, but
baksmali complains for "unsupported oat ...
0
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0answers
68 views
Ghidra: Identify and display a struct broken into multiple smaller fields
Me vs the 90s game, part two.
I'm trying to figure out how the game detects the current date, since that part doesn't work correctly anymore. At some point, GetLocalTime() from kernel32.dll gets ...
0
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1answer
463 views
How to find main() of Windows EXE with Ghidra?
I'm new to Ghidra, my goal is to add localizations for a small EXE program. The program was written in Visual Studio and has Russian dialogs, which I like to convert to English.
I've loaded the EXE ...
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0answers
82 views
IDA: Function arguments detection
I have searched here and there for this, but I could not find anything really related to it. So, I have been meaning to ask how IDA's algorithm to detect function arguments and return values works. ...
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0answers
65 views
ZKM 15 Deobfuscation (Jar file) [closed]
Hello I am looking for someone who can deobfuscate a ZKM 15 obfuscated jar file for me.
I am willing to pay money for this.
I mostly just need Strings from the jar file. It doesn't need to be perfect.
...
0
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0answers
144 views
Improving Ghidra's Auto-Structure creator
I'm currently attempting to read decompilation in Ghidra. I've identified what I believe to be a "God object" that the library is uses to store state for the entire program. It's passed ...
2
votes
2answers
179 views
MIPS assembly to C code
I think I'm really brain-dead and am not really sure what to do next, but I am trying to manually convert assembly code to a C program. It's not really working, but I'm not sure what is wrong. I would ...
2
votes
0answers
77 views
Understanding Hex-Rays syntax
I have a Ida decompiled function that invokes another function through a function pointer but I'm really confused how it calculates it's address. I'm new to hex-rays syntax.
int __fastcall SUB_XXXX(...
2
votes
2answers
281 views
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 (in the sense that ...
0
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0answers
71 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
82 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
542 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
156 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
61 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
121 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
vote
1answer
83 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 ...
0
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2answers
92 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
231 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 ...
0
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0answers
66 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 ...
0
votes
1answer
68 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...
0
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1answer
229 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
votes
1answer
143 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
37 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
36 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
134 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
49 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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0answers
61 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
117 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
vote
1answer
84 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 + ...
0
votes
2answers
1k 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 ...
1
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1answer
2k 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 ...
