Ida deobfuscator plugin

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Reverse Engineering Stack Exchange is a question and answer site for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation. It only takes a minute to sign up. I am trying to reverse engineer an executable that uses a lot of control flow flattening obfuscation i. But it generates a lot of data. I know there is a vm hanging around somewhere in there and I am having trouble finding it just because of all the obfuscation.

When I open it in yEd Live it looks like there are multiple virtual machines or something? Yeah not really sure where to go with this, if anyone has any advice that would be awesome.

But what throws me off is how much branching goes on later on through the execution. One would have to look at the code. How are the jump targets calculated? From your diagrams it could also be something as simple as:. And they just replaced all absolute jumps in the.

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Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How to deal with heavy control flow flattening? Ask Question. Asked 2 years ago. Active 2 years ago. Viewed times. Jeremy Jeremy 1 1 silver badge 5 5 bronze badges. Have you considered trying Triton?

Or any symbolic execution based analysis tool? I have looked at Triton and angr but the code I am studying is unpacked and written to memory during execution and has a lot of anti-debugging techniques. So I'm not sure how to use the tool. Would it work to run it and them dump the executable and do symbolic execution on that?

Then I don't have any state information. It mainly depends on the complexity of the packer. If it relies heavily on crypto and on low-level system calls, then you can forget about these tools. But, if this is only easy compression or encoding, then it is still possible though the symbolic execution is not really efficient against packers.

I'll run it through angr and see what I get anyways; but I'm skeptical how useful the output could be. Well, if you can create a core file at some point, I am quite sure that the binary loader of angr has an entry to load those files see here.

But, I never tried it Active Oldest Votes. Jump targets are calculated using heap data as input. I believe it may be possible to reverse engineer nut there are a lot of subroutines.

ida deobfuscator plugin

Jeremy okay, that does indeed smell like a vm.In our knowledge, Unicorn has been used by following products listed in no particular order. Radare2 : Unix-like reverse engineering framework and commandline tools. Unicorn-decoder : A shellcode decoder that can dump self-modifying-code.

Decode : Decode obfuscated shellcodes. Roper : build ROP-chain attacks on a target binary using genetic algorithms.

Patchkit : A powerful binary patching toolkit. Shellbug : Basic command-line, text-based, shellcode debugger. Ripr : Rip out functionality from binary code to use from Python. Js : A port of the Unicorn emulator for JavaScript. Pwntools : CTF framework and exploit development library. UniversalRop : Small tool for generating ropchains using Unicorn and Z3. Cuckoo : Automated dynamic malware analysis system.

CircuitBreaker : Nintendo Switch hacking toolkit. Syntia : Synthesizing the Semantics of Obfuscated Code.

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Fygimbal : Tools for talking to the Feiyu Tech gimbal via serial. Dbghlpr : It provides various functions useful for debugging using Windbg.

Cxbx-Reloaded : Xbox Original Emulator. EmuHookDetector : Hook detector using emulation and comparing static with dynamic output. Scanr : Detect x86 shellcode in files and traffic.

AndroidNativeEmu : Partly emulate an Android native library. Uses Unicorn as a reference for testing the custom emulator. Unicorn Tracer : Adds some functionalities to the Unicorn framework to ease tracing of changes in memory. Pad unpacker : Puzzle and Dragons binary unpacker. Ryujinx : Experimental Switch emulator written in C. Emusca : Power trace simulator for side channel analysis attack testing. Dwarf : A debugger for reverse engineers, crackers and security analyst. Rainbow : Easy scripting interface to emulate embedded binaries for tracing.

Lightswitch : Run Nintendo Switch homebrew and games on your Android device! Packman deobfuscator : League-of-Legends anti-cheat code deobfuscator. ShellCodeEmulator : Windows shellcode emulator.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. No core dependencies for the plugin. Nevertheless certain fetures will be disabled without these python libraries installed:. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Reverse Engineering — Decompiling A Virus To C Source Code (IDA Pro)

Python Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit.

Reverse engineering tools review

Latest commit a0c53b6 Nov 29, Install Dependencies No core dependencies for the plugin. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Oct 17, Oct 24, Nov 28, Oct 19, Fix compatibility with IDA7 Qt5.

Oct 23, Nov 23, Hi all, this is my new, basic deobfuscator plugin for IDA. Bon giorno pizano, What, and into what does it de-obfusticate to? Can you post a little screen shot?

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From where the obfuscations infos are inserted and so on. Could you provide a little video tutorial on how to use it? Hello, first of all, thanks for the contribution. The plugin seems to work well enough, however I am experiencing some access violation when trying to deobfuscate too much data. Moreover, I have some usability suggestions: what about using the "selection" to determine the boundaries of the code?

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IMHO, it is more convenient than navigating to the end of the obfuscated section, especially when dealing with huge amounts of code again related to huge amount of code: it would be nice to either get rid of the messagebox related to the number of instruction read, or at least make it appear every instructions processed please avoid spawning notepad.

I would say that the txt file is enough, and if you want to have the display integrated into IDA you can create for example another tab and use that to display the results. However, these are minor things, keep up the good job!!! You could also just send it to the clipboard so one can paste the text into notepad or similar. What I would like to have or make as it doesn't seem to exist yet is a Themida clean up plug-in.

Basically something that goes through a dumped Themida target and cleans it up to make it more readable, thus easier to RE.

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Ideally it would understand what Themida opcodes are and place names for them I. At least go through and mark the Themida'ized groups with colored text or something and then fix the real 0x86 code around them IDA gets confused over it.

Fixing functions that have Themida codes in them too, as it stands with the default meta PC? Edit: A lot of work in the area already I found today. However, in. Next version will be available for both olly and IDA, as it will use libdisasm as 'neutral layer' for disasm purposes.

Analysing automatically complex VM But go for it. All rights reserved.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Reverse Engineering Stack Exchange is a question and answer site for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation.

It only takes a minute to sign up. Trying to deobfuscate x64 code. This is the same as the Variant 2, except it has been broken into two sections. Planned solution will involve distorm3's flow control flags, and rewriting jmp to 0xfe7a What a horrifically long way to effect to decrement RSP by 8. I am also starting to suspect that there are going to be many permutations of all these techniques, and I need to start addressing the problem in IDA.

The problem is, the only sample source I can find uses IDAPython idaapi low-level functions, so the code is ridiculously long, and as I am replacing a 5 byte instruction with a 4 byte one, I cannot find a way to alter the operand I have inadvertently created. Fortunately, in this case, it's just CLC. Update: I have fixed this issue, and the solution has drastically reduced the size of my script.

The pertinent fix is below:. I want a better solution, and I am not afraid to code it. I am how-ever in need of some starting advice, plus I need to make sure I am not re-coding the wheel here. I have since written some other IDAPython code using the higher level idautils to create call trees, and collate xrefs and such. But I don't know how to rewrite the actual disassembled code at that level. I have looked at various examples of quite nice IDAPython code that can:.

I am not adverse to writing an. I'm learning Python as I go, but. Because the code I am working with is exclusively bit, there is little basically no pre-existing deobfu samples or code out there. And so here I find myself, asking for your patient guidance. Very patient if you actually read all of that.

ida deobfuscator plugin

PS: I took the time to document everything I had done, because I know how little respect we all have for people who don't even attempt something before hollering for help.

Definitely there are several possibilities to remove the obfuscation. I will try to describe one of them which I partly applied. Scenario I is straightforward and with that one I made some successful tries and wrote a program for it :. Identify the pattern "by hand", write down the bytecode sequence, and write down the - simpler - bytecode replacement. Let the program replace all found occurrences with the hopefully simpler replacement.

ida deobfuscator plugin

You might gain a lot of space for possible patches. Scenario II is the more difficult part, as the breaks can show up anywhere and no unique bytecode sequence is possible any more for an obfuscation pattern.

I would probably proceed in the following way, however not having tried it yet:. Independent from obfuscation, find a solution to remove the "breaks" in the code, i.It would consist of something like a compiler with JIT optimizer such that the new generated assembly code and executable would be slightly less obfuscted, the original recompiler idea would have some features like:.

The best option may be IDA's deobfuscator plugin which crashes for a large ammount of code.

ida deobfuscator plugin

What would "codeflow rebounding" be? Anyway, there have been attempts that apply compiler optimizations for deobfuscation and they seem to work well enough for the targets they were written for. There are already loads of different static binary analysis frameworks out there, don't add yet another one. None of the above mentioned tools work on everything you throw at them -- if that's what you mean when talking about serious stuff.

But focus your effort on fixing an existing tool anyway. Codeflow rebounder I mean to try to robound the broken code. Its very tipicall to see instructions like:. DeCV works for devirtualization for that particular VM.

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What I am trying to accomplish here is a generic deobfuscation notice that I am just trying to make the code a little bit more readable tool that might work better than the currently available tools. E: work for larger amount of code lines in a decent time.

My experience with IDA deobfuscation plugin is that it doesn't work when the code is too large. The problem is that its internal IR is very difficult to deal with if we wish to represent a stack based machine like x I used it for some "practical" purposes but its very limitative.

I really think it would be better to start by 0 and build a whole new compiler.

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But the more feedback I have from other people, the better this will be. You'll spend lots of time on it, it may or may not work, and then everyone who wants to contribute will have to learn this new complex system before doing anything.

I would do the first version yes, I was just trying to understand what others think. But like I said, it may take some time untill I have the time to work in it and I may realise in the meantime that it may be computationally untreatable?

I don't know lets just see how far the rabbit hole goes. You need to be a member in order to leave a comment. Sign up for a new account in our community. It's easy! Already have an account? Sign in here. Future Community Projects Search In. Recommended Posts. Posted May 20, Share this post Link to post. Posted May 21, Posted May 21, edited. So, bottom line, you think this is a bad idea? Edited May 21, by xSRTsect see edit history.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again.

IDA Technology: Open Plug-In Architecture

I'll be organizing the plugins over time. Please submit PRs if you have any other outstanding plugins. I would like to tag each plugin with its corresponding IDA version, but it will take me a long time to test.

If you can help there, please do. If a plugin is only a source repo with no description or documentation, I am not adding it. Adobe Flash disassembler : The 2 plugins present in this archive will enable IDA to parse SWF files, load all SWF tags as segments for fast search and retrieval, parse all tags that can potentially contain ActionScript2 code, discover all such code a dedicated processor module has been written for it and even name the event functions acording to event handled in it eg.

Currently, the heuristics in this module find code in a few different ways. Some instructions identify and define new code by looking for comon byte sequences that correspond to particular ARM opcodes.

Other functions in this module define new functions based on sequences of defined instructions. Android Debugging : This version have both support for native arm debugging via usb and sdk ADV manager. Android Scripts Collection : Collection of Android reverse engineering scripts that make my life easier. The output is an ordered list of identified Windows API references with some meta information, and an ApiVector fingerprint. AutoRE : Auto-renaming plugin with tagging support.

BinAuthor : Match an author to an unknown binary. BinNavi : BinNavi is a binary analysis IDE - an environment that allows users to inspect, navigate, edit, and annotate control-flow-graphs of disassembled code, do the same for the callgraph of the executable, collect and combine execution traces, and generally keep track of analysis results among a group of analysts. Bin Sourcerer : BinSourcerer a. Places structure defs, names, labels, and comments to make more sense of class vftables "Virtual Function Table" and make them read easier as an aid to reverse engineering.

Creates a list window with found vftables for browsing. This module will annotate the firmware vector table, which contains a number of function pointers. This vector table annotation will cause IDA Pro to perform auto analysis against the functions these pointers point to.

Data Xref Counter : Enumerates all of the the x-references in a specific segment and counts the frequency of usage. The plugin displays the data in QtTableWidget and lets the user filter and sort the references. You can also export the data to a CSV file.

It was released during SyScan Drop : An experimental IDA Pro plugin capable of detecting several types of opaque predicates in obfuscated binaries. It leverages the power of the symbolic execution engine angr and its components to reason about the opaqueness of predicates based on their symbolic context.

This can then be imported in to gdb and other tools, allowing you to debug using info you have recovered in IDA even when you cannot connect the IDA debugger. This is done using the IDA Debugger API, by placing breakpoints in key locations and saving the current system context once those breakpoints are hit. From the instruction trace, register values and code coverage of the run-time information are visualized in IDA Pro through instruction comments and line colorations.

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