Questions tagged [decompiler]

Software used to revert the process of compilation. Decompiler takes a binary program file as input and output the same program expressed in a structured higher-level language.

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In the Hex-Rays decompiler, is it possible to assign macros such as NT_SUCCESS

Suppose the decompiler came up with something like this: if (Status >= 0) { // ... some other pseudo code } Is it possible to prettify this code with the NT_SUCCESS() macro, like this: if (...
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Why does Ghidra save a function return value to a different variable?

I've started learning how to work with Ghidra and I've stumbled upon a problem that I don't know how to solve. The program that I am disassembling calls a function argc_check, which returns a result ...
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Patch .net executable via hex editor

What I am trying to do: I have an .exe written in C#. Ilspy shows the code. Inside it has a class DoWork with static field SomeValue: // Program.DoWork public static int SomeValue => 15; In code, ...
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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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1answer
117 views

What does Ghidra mean by ._0_3_?

What does ._0_3_ mean in the Ghidra decompiler? my_string[0]._0_3_ = CONCAT12(DAT_14123b1f6,DAT_14123b1f4);
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IDA PRO decompiler expression last question (pseudocode)

memory=VirtualAlloc(lpAddress, 3*v48, flAllocationType, 16*v19); ..... shellcode=(int (__stdcall *)(_DWORD, _DWORD))memory; ..... shellcode(&hkernel32, 0) If ...
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Does anyone have any information about the file format of a .jdb2 (Jeb Decompiler's Project file) or how to fix one that is corrupted?

I have a .jdb2 JebDecompiler project file which is corrupted and JebDecompiler can not open it. Any information about .jdb2 file format could be useful for me in order to read data from it and even ...
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Is EVB protector Reverse-able?

i try reverse game that has Enigma Virtual Box as Protector and unable to read it via decomplier program. or the way to reverse this protector is manual only? reverse that i mean is unpack the dll ...
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1answer
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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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Can I ignore this Ghidra USTACK var?

I'm new to ghidra but best I can tell the decompiler here is just plain wrong. Just want to make sure that I'm not somehow missing some x64 or fastcall concept here and that I'm right that I can ...
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Analyzing a Composite Document File V2 Document MSI Installer malware

I have a malware to analyze with md5sum - 000cbfb28e750f2e321551c03e4fe488 When I run the command on linux : file {malware-file-name} it shows : Composite Document File V2 Document, Little Endian, Os: ...
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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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How to stop Hex Rays optimizations?

I know it's not a bug, but a feature. Hex Rays found that there's a variable which is set to specific value, thus there's no need to display the branches where the code will never be run, so it warns ...
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1answer
118 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 ...
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1answer
856 views

Recaf: Recompile disabled, can't edit

I've download recaf jar file and install JDK 8. When I execute it/start it, it all works fine with java -jar recaf-2.12.0-J8-jar-with-dependencies.jar. I open a class file also no problem. The issue ...
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106 views

Change the behavior of any running process

Would it be possible to develop a program that decompiles the instructions of a running process, for example into a C-like language, and allows them to be modified and then injected into the process ...
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1answer
946 views

How to open new window of decompiler or resize the decompiler of Ghidra?

This is very small and inconvenient to read. How do i open new Window (any shortcut key) or resize it, for some reason i cant resize. Any help? EDIT: Oh thanks Shane Riley, i clicked the blue button ...
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What does the code keyword in Ghidra mean?

I'm reversing a binary and I found this strange keyword I haven't seen before called 'code'. I looked up the C++ keywords and there doesn't seem to be one. Could anyone provide me with more ...
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Is there a list of Ghidra's variable prefixes?

In Ghidra, the decompiler prepends various prefixes to variable names. For instance, iVar1 is an integer. However, there are a lot of prefixes that aren't immediately obvious, find some below, but I'm ...
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1answer
279 views

how to infer data type in ghidra decompilation result

how to infer data type in ghidra decompilation result for /usr/bin/ls ?
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How to decompile /usr/bin/ls

How to decompile the following assembly instructions ? Note: this could be reproduced using /usr/bin/ls binary inside ghidra
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1answer
539 views

Ghidra Decompiler Optimized Strings

Looking at a large x86 binary, I'm seeing lots of instances where strings are assembled on the stack as quadwords like so: If I try to set the type of puStack40 to char[38], I get the following ...
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1answer
244 views

Decompiling tools for "Old" exe files?

I heard about dnSpy or ILSpy for decompiling .net files. But how about those files that was NOT written by .net!? Probably those files previous to XP. Is there any tools to decompile it to, ...
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1answer
88 views

Automatic decompilation from Assembly x86

Is there a tool to automatic decompile an assembly x86 code? What I need is a tool where I simply paste my code and it returns C code. Thanks
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Ghidra wrong array size

I'm new to the field, so it's probably a stupid question, but when I tried to decompile this binary from picoCTF 2019 I got an array of size 4 (local_38) when looking at a solution it should be of ...
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1answer
547 views

Need to decompile executable from Openwrt ELF 32-bit

what best tool to use to decompile executable from Openwrt image ELF 32-bit MSB executable, MIPS, MIPS32 rel2 version 1 (SYSV), dynamically linked, interpreter /lib/ld-uClibc.so.0, no section header ? ...
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IDA Hex-Rays structure inline functions recognition

I've seen multiple posts about the subject, but mine is a little bit more specific about what I want to achieve. I have many times situations where Hex-Rays decompiler outputs 16 lines of code and I ...
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1answer
396 views

Stack-pointer analysis failed

I'm testing my toy obfuscating C compiler against IDA's decompiler, but IDA refuses always functions (then the decompilation is not possible). For example, at one of lowest-levels of obfuscating, a ...
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1answer
169 views

Hex-Ray Decompiler: inline function not recognized

While trying to decompile an application with Hex-Ray 7.0, I stumbled upon the problem that in nearly all cases, what seems to be a certain inline function will not be recognised, which bloats the ...
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1answer
62 views

IDA Pro: __GETDS breaks decompiler output

when trying to decompile some interrupt service routines done with Watcom, the __GETDS call at the beginning of the functions will break the decompiler output completely. Here's the disassembly: And ...
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2answers
274 views

Can I decompile a file if I have a compiler? [closed]

Is it possible to reverse the compiled code using a compiler? I have a compiler in the form of exe and using it I can compile the file. But there is no possible instruction I got to decompile a file. ...
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1answer
436 views

Is there a way to show exceptions handlers in Hex-Rays decompiler output?

Is there a way to show these exception handlers in the decompiled code? I can't tell that a block is in a __try block without looking into the disassembly. __int64 __fastcall ...
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2answers
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Template code with 0xcccccccc in every ghidra decompiled function for some executables

I often have some code like this on the beginning of every function of a decompiled program: iVar1 = 0x42; puVar2 = local_10c; while (iVar1 != 0) { iVar1 = iVar1 + -1; *puVar2 = ...
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224 views

IDA Hex-Rays Decompiler Generates ASM Code Issue

For a long time now, I've been struggling with some functions generated with IDA HexRays plugin that seem to be corrupted. Some of the decompiled generated plain C code, show as ASM code :/ i.e: ...
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1answer
6k views

How do I make a hex literal a decimal literal in Ghidra?

There are a few places where the decompiler displays a number as a hex literal when it's much clearer as a decimal literal. How do I change this?
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1answer
117 views

Is it possible to recover the key to a decrypted file?

Is it possible to recover the key to a decrypted file if you have the initialization vector and it uses RijndaelManaged? If so how? The file I want to recover the key from is a xml that looks like ...
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2answers
1k views

NSA Ghidra 9 - Is the decompiler open source?

I recently downloaded Ghidra (link) ver 9 on windows. The decompiler feature is presumable found at <GHIDRA_HOME>\Ghidra\Features\Decompiler There is a lib folder containing the Java code. ...
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1answer
322 views

Is there any decompiler, which can produce a compilable result?

I would like to decompile a 32-bit Linux executable to C, modify some parts of it, and then compile it back. I do not care if the C code is not pretty and really hard to maintain. The only thing I ...
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2answers
608 views

Is PNF's JEB Reverse Engineering platform written in pure Java?

I have seen the JEB decompiler by PNF Software morph from a specialised decompiler to a full fledged reverse engineering platform like Capstone or IDA Pro. While examining the earlier versions of JEB,...
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Decompile Python for ELF Binaries

There are several solutions available to extract Pyc files from Windows binaries and then decompile them using uncompyle2 or uncompyle6. However, I have a Linux ELF 64-bit binary which was compiled ...
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601 views

What's a decompiler that can be extended to new architecture, and how can I do it?

I was reverse engineering a binary file. Details does not matter. The important part is that it is written in an architecture that is very unpopular, and there is no existing disassembler or ...
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4answers
3k views

Can AI be used to write better decompilers/disassemblers? [closed]

In the past for years I used some disassembler and tried some decompiler, nowadays there's so much talking and stuff about deep learning and AI, I wonder if some can be used with those tasks (given ...
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Split variable in Hexrays decompiler?

With Microsoft Visual C++ executables, I often run into decompilations like this: void __cdecl Pbdf::ReadString(char *dst, Pbdf *pbdfOrLength) { Pbdf *pbdf; // esi pbdf = pbdfOrLength; ...
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1answer
527 views

Tools to translate x86-64 ELF to PPC (or i386 decompilation)

I've been working on a project on an IBM POWER8 system. I'd like to translate some very simple binaries from x86-64 to PPC. Is there a tool that can either: Translate the binary from x86-64 to PPC (...
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2answers
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Decompile lua from Unity Games

I discovered that a Unity games have lua scripts. I tried to decompile lua using some tools but they are not working with lua from Unity Games. The header doesn't look the same so they seems encrypted....
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2k views

IDA hex-rays decompiler not loaded

I have an executable that is c++(x64) compiled code upon which the decompiler is not loaded. In other files, it works fine. But they are mostly written in c. I am not sure if it is a limitation in ...
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1answer
58k views

Can we decompile an .exe or .dll as %100? [closed]

Can we decompile a .exe or .dll file as 100%? Also sometimes seems some mistakes on somewhere (like mainfrm.cs) , how can we fix that? What is the best .NET decompiler? or What would you prefer? I ...
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1answer
8k views

Why is IDA call analysis failing?

I am trying to reverse an ELF (C++) binary using IDA v6.95. Decompiler complains that the call analysis is failing. I am attaching the IDB database. What can I do to fix the IDB?
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How can i rename Array to API Name in IDAPro?

I am studying to analysis malware.. While to analysis a malware using IDA, I want to rename array to API Name. To Help your understanding, attached image. Please help. Thank you
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What is a good and reliable C decompiler that support ELF and SH4 Architecture?

I have a ELF file, which is a partial firmware of a navigation module(my BMW idrive CCC), I need to decompile the elf file. I tried Reko Decompiler which said it does not support SH4 and Snowman ...