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Questions tagged [deobfuscation]

Techniques to remove obfuscation from a piece of program.

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427 views

How to use Ghidra to work with VM obfuscated binaries?

By "VM obfuscated binary", I mean a binary that contains one or more implementations of a VM internally, and also some bytecode that can run on this VM. One of the reasons why this binary is this way, ...
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0answers
65 views

Reverse engineering hidden audio track in this MPEG-1 video file?

No matter what video player or video analysis software I throw this video at, neither are able to reproduce or detect the audio track of the video: Introduction video of Wipeout XL PC version (...
2
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1answer
713 views

How to reverse engineer an exe built using nexe?

I am working on an express application. I obfuscate the source code using javascript-obfuscator. I am using nexe cli for generating a single exe from the obfuscated code. Can anyone tell me if there ...
2
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1answer
747 views

De-obfuscating code ran through JScrambler 3x via Eval() functions

I am relatively new to JS and de-obfuscation in general and I am having difficulties reversing some complicated JS. I know the code itself is obsfucated via jscrambler 3-4x and therefore is ran ...
2
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1answer
185 views

Does a symbolic disassembler exist?

I would like to know if there are disassemblers based on a symbolic analysis, I'm beginner in RE, but I think that a disassembler based on symbolic techniques can be very interesting and could ...
2
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0answers
1k views

How to decompile a obfuscated mach-o dylib?

I am trying to decompile a dylib called libConfigurer64.dylib, which is loaded from the environment variable "DYLD_INSERT_LIBRARIES" I want to analyze what it really does, so I dragged it in to IDA,...
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0answers
2k views

Can de4dot deobfuscate Dotfuscator Professional?

I ran de4dot on a Xamarin app obfuscated using Dotfuscator Professional. However, there's still the random switches and strange ints everywhere. Can de4dot decode this? If not, is there another tool ...
2
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0answers
743 views

Decode RubyEncoder

I was trying out some things when I came across some RubyEncoder encoded code. After searching the web, I found basically nothing useful on how to reverse them (Except this and [this][2], but I had no ...
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0answers
1k views

Do any known deobfuscateors work on Agile.net 6.4?

As a company we are going to start obfuscating our released binaries, so far the best front runner we have found has been Agile.net 6.4. I took one of our binaries we obfuscated with the trial ...
2
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0answers
565 views

find CRC algorithm, having some input and output data pairs

I'm trying to discover the algorithm of a lost software, there is an equipment that requiest some data, and validates the data using the "KEY", if you change any parameter of the data then you need a ...
2
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0answers
196 views

Javascript equivalent of JEB

In case you already know, there is a full-feature decompiler for Java/Android called JEB (https://www.pnfsoftware.com/) Some of the most important features include the ability to rename identifiers ...
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1answer
3k views

What kind of obfuscate is this?

I'm trying to deobfuscate a .NET exe file, using de4dot. I have many dll files, when I open the dll file with .NET Reflector, it appears like this: And when I did the deobfuscation again with de4dot, ...
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1answer
2k views

How to deobfuscate native Android library obfuscated with OLLVM?

When I load the binay in IDA, all I can see are loads of .datadiv_decodeXXX... functions and this is because of OLLVM. I know it is possible as a Chinese article I found said they were able to ...
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2answers
5k views

(de4dot) The file isn't a .NET PE file

Probably, many of you have ever seen the message from de4dot while trying to deobfuscate app/dll: WARNING: The file isn't a .NET PE file: What steps to take in such cases to proceed? How to make the ...
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2answers
677 views

Debugging Win32.Upatre - why does Ollydbg fail to analyze this?

So I've been looking at this thread - Where can I, as an individual, get malware samples to analyze? And grabbed myself a binary sample of Win32.Upatre from Halvar Flake's blog. I started analyzing ...
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1answer
242 views

Is it possible to completely reverse this code?

i have this code i'm trying to deobfuscate https://pastebin.com/g5mHpWE4 I used https://beautifier.io/ and http://www.jsnice.org/ but the result is still not good, current code: https://pastebin.com/...
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1answer
4k views

Is deobfuscation of my javascript code hard or easy?

I am trying to protect my app code from theft. Since most of it is written in javascript I had to use many obfuscation techniques to make it incomprehensible. I have written a very small piece of ...
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2answers
1k views

how to deobfuscate Autoit strings?

The code is: https://pastebin.com/ZwvySjgy Is it possible to deobfuscate the strings protected with STRINGDEC?
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1answer
6k views

Decompiling and deobfuscating APK file

Let's suppose that I have an APK file. I decompiled it but I have very obfuscated code. Is it possible to analize this APK in such way that application will be executed step by step (instruction after ...
1
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1answer
386 views

Reversing a key-gen firmware for RISC-V

I would like to study this firmware for Sipeed MAix, a RISC-V development board. You can download it here: key_gen_v1.2.zip. As the name suggests, its purpose is to calculate and print a "machine key"...
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1answer
492 views

What's this obfuscation technique?

I'm reverse-engineering a particular dylib on Mac OS X. The dylib is highly obfuscated, but I suspect it's from some well-known technique that I'm not aware of. I'd like to describe it in the hope ...
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1answer
263 views

What is the difficulty/advantage to obfuscate a multi-thread program?

According to my knowledge, several obfuscation strategies are widely used(or at least described in academic) like: complicating control flow inserting bogus control-flow control-flow flattening jump ...
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1answer
186 views

Any good places to learn about JS de-obfuscation?

I am trying to make a bot on a specific website, so I have to reverse a lot of JS scripts. The reversing it self is not that hard but the de-obfuscation is. Lots of the scripts are obfuscated with ...
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1answer
284 views

devirtualize? or what is this obfuscator? and how to get rid of this

from previous question i still dont get any info or any process at all... now i asking again with this question is this virtualize code or something? i try many thing and it still didnt work [i unpack ...
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1answer
40 views

Is there a way in ida pro to see the address where I have explicitly marked them as code or data, etc?

I'm analyzing an obfuscated binary. IDA did a pretty good job of doing the initial auto-analysis. Later, I went through and marked some sections as undefined, or code, etc. Now IDA can't re-create ...
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1answer
335 views

How to decompile heavily obfuscated classes mixed with Arabic/Chinese/Korean characters?

I recently downloaded a jar file and was curious to see if it was malicious, so I ran it through FernFlower and it wasn't able to deobfuscate it. When I unzipped the jar, I looked inside it and saw ...
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2answers
277 views

Working with strong obfuscated Java

I've got a jar file, that is strong obfuscated. When I tried to put it into decompilers such as bytecode-viewer and luyten I seen many lines of traps and Chinese letters. I tried to deobfuscate it ...
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1answer
222 views

Reverse Engineering Java - Deobfuscating symbols

I'm new to Java and working on cleaning up a fairly large Java .jar sample where the obfuscator has renamed symbols into invalid names. For example: import org.lib.00.0.2; public final class 90 ...
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1answer
263 views

De-obfuscation - Emulation-oriented vs Script-oriented

What are the advantages of each method when employing de-obsfucation of potentially malicious code? I've been told to always use emulators like x86emu since it doesn't actually run the code when ...
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1answer
321 views

deobfuscating javascript injected into Wordpress

Found a WP site (not mine) with lovely obfuscated code injected into the footer so I've been trying to de-obfuscate it. I ran it through unpacker, then converted hex to ASCII, then un-minified to ...
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2answers
3k views

Renaming entitites in obfuscated java bytecode

I'm working with an SDK for developing apps that's distributed as an AAR, and has been obfuscated with ProGuard. I'm just trying to reverse a few things it does. The classes, methods and variables ...
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1answer
1k views

Are .NET DLLs, even the best obfuscated ones, less secure than C++ DLLs?

From what I understand about .NET code, it is first compiled to Microsoft Common Intermediate Language (MSIL) before being translated to machine code at runtime. Whereas C++ code is compiled directly ...
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1answer
1k views

Cannot detect obfuscator of the obfuscated DLL

I want to do a reverse-engineering of an obfuscated Unity DLL assembly, but de4dot doesn't work. It says "Unknown Obfuscator". Also tried iMPROVE and it says that there is a 97% chance that it is a ...
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1answer
2k views

Decompiled Java classes span multiple files

I've been playing around with decompiling Android apps from dex/jar files to java source code, with varying success. I've tried the usual suspects - JD-GUI, procyon, cfr, krakatau and jadx. I'm having ...
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1answer
736 views

I'm decompiling an apk file to learn how the creator designed the UI for their app. Are these layout files obfuscated?

I'm new to decompiling apps. Most of the apps I decompile aren't very popular, so obfuscation hasn't been a problem yet. I'm not entirely sure what obfuscation looks like. The current app I'm looking ...
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1answer
5k views

Tools for automated deobfuscation

To evaluate different Java obfuscators, I want also consider if the obfuscators use preventive techniques against common tools used for automated deobfuscation. Therefore I plan to obfuscate a test ...
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1answer
220 views

Reversing Checksum of serial protocol

I'm trying to reverse engineer a serial protocol of a compressor, but i've no luck calculation the checksum. e.g. here are some messages including the 16-bit checksum at the end of the message. ff ...
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0answers
48 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. ...
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0answers
37 views

How can I decode this Malicious php code?

I found this backdoor on a client's website. https://github.com/baogiaphucthinh/Malicious-php/blob/main/1259da6sc.php (original file) I have gotten rid of it and realise it's an obfuscated script but ...
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0answers
44 views

RE on firmware images that seem to use weak encryption/obfuscation. Robot vacuum

I have been playing with some robot vacuums that utilize very basic navigation, and I am wanting to play around with my own provisioning along with adding a Rpi to augment features. These vacuums are ...
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1answer
104 views

How to deal with IDA auto-analysis analyzing invalid paths?

Obfuscation techniques such as opaque predicates often trick IDA's auto-analysis into creating incorrect or contradicting interpretations of the code under analysis. There is some mention of ...
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0answers
84 views

Looking for obfuscation patterns within jumps

I'm working on an obfuscated binary. I recognized some patterns used to confuse the disassembler, some used to obfuscate function calls, some other for conditional jumps and so on. The idea was to ...
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0answers
1k views

Reversing PyArmor + Pyinstaller

Created an application, protected by PyArmor and used pyinstaller. I'm trying to reverse engineer it. So far I've decompiled the exe into pyc files but it's still pyarmor encrypted I can only see the ...
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0answers
175 views

Guidelines for dealing with obfuscated code

I have taken a deep dive into reversing software with IDA, I used Ghidra before. I have already solved a couple of basic crackmes now I have targeted another one which's code is obfuscated, also has ...
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0answers
45 views

Main contemporary deobfuscation techniques

Could you please specify in a few words main contemporary deobfuscation techniques which we can apply to 32/64 bit PE files? For example, (1) using instruction templates, such as: mov edx, 5B1F04F1h ...
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0answers
305 views

What is the header 'X-Goog-Spatula'?

I am blackboxing an android app to write an API for it. Many of the HTTP requests sent include a mysterious header with the name X-Goog-Spatula. If I do not include this structure, the request is not ...
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0answers
120 views

deobfuscating/decompiling extremely complicated javascript [closed]

I am working with some extremely complicated JavaScript. It is around 70,000 lines long and sections of the code look like this U2xx.l11="0x78920d50";m2xx.r9G="11";b2xx.v3y="0x744ebc37";P2xx.K5h="...
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0answers
1k views

How to detect obfuscator (de4dot shows: Detected unknown obfuscator)

Generally, I use de4dot to detect obfuscator or deobfuscate. But some files are protected as they show: Detected unknown obfuscator What are ways to detect the obfuscator of .exe?
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1answer
645 views

Map an obfuscated javascript file to the original

Among other approaches, there are ways to "prettify" obfuscated javascript. But most of such approaches are geared towards someone trying to understand code that's not their own (e.g. from a website, ...
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0answers
1k views

de4dot and Dotfuscator: IL looks different, not DotPeek decompiled code

From the obfuscated to the deobfuscated assemblies, IL code looks different using ILDASM; however, DotPeek decompiled C# code looks exactly the same for both. Any clue why? The obfuscation software ...