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Questions tagged [obfuscation]

Concealing the nature of how things truly function or work.

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6 views

How to choose a .NET software protector which will have a small impact on run-time performance speed?

I am writing a .NET software which is doing calculations and drawing in real-time i.e when the user is moving the mouse. I want to protect this software from being reverse engineered and restrict its ...
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1answer
357 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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0answers
29 views

Replacing a function call with it's result in a script

I'm working with a heavily obfuscated Autoit malware script and one of the major problems is that almost all variables and lines of code are obfuscated by a custom function. The problem is that this ...
1
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1answer
101 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 ...
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2answers
120 views

Jump in the middle trick

I'm reversing a program that "hides" some instructions using the jump in the middle trick. This trick is a jump to a middle of an instruction, whereas the real address actually contains another opcode....
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0answers
69 views

Decode Rolling Code

I have a motorized curtain, which uses a 433Mhz RF Control. I'm trying to figure out how is it encoded. I could already get the times and converted to HEX representation. Below has 10 samples for ...
1
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1answer
130 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 ...
6
votes
1answer
316 views

Simplifying assembly

I'm analysing some binary trace, it's pretty much obfuscated. What I need to do is to understand work flow of its alghoritms. However I cannot find any reliable tool which would help me with that. I ...
1
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1answer
236 views

Analyzing and deobfuscating complex JS code [duplicate]

I am looking to reverse engineer a very ugly piece of JS found here. As far as I can tell, this script generates and sets some cookies on my browser that identify it on the site. Deobfuscating it ...
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0answers
137 views

C# Hidden Method through transparent proxy object?

I'm dealing with an interesting form of obfuscation. A C# program I am reversing has a central API, let's call it "Central API". This Central API has several functions that aren't exactly defined. ...
7
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2answers
295 views

Why do obfuscators remove line numbers, and can I safely leave them in?

Application security engineer here. When we compile our java code, we obfuscate it using KlassMaster and have it remove line numbers (see KlassMaster docs) because of a handwavy explanation "it makes ...
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1answer
176 views

What is the difference between stripped binary and obfuscated binary

I want to know the difference between stripped binary and obfuscated binary.
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0answers
490 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 ...
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3answers
159 views

Obfuscated code analysis - can unused variables be ignored?

I am analyzing a malicious javascript. The code is encoded and obfuscated in a way that I did not manage to even partially deobfuscate yet and it is filled with long strings. In order to simplify the ...
1
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0answers
47 views

Missing Map from Java Native Method to C Code

When writing a C implementation for a native Java method in Android, the rule is to name the C function according to the convention "Java_com_...". But I encountered an APK in which there are no such ...
1
vote
1answer
965 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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0answers
204 views

Obscure router refuses to flash OpenWrt

This is a very obscure Chinese router from a brand called Wavlink. It's the Model: WN529R2/WN529R2P. It's web interface was pretty limited and wouldn't allow firmware modifications. I found GND/Tx/Rx/...
3
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2answers
142 views

Why doesn't this retn instruction return from the function?

I disassembled an exe file on Windows with IDA and saw this function prologue: I see that when the retn executes instead of returning it jumps to sub_1314cba4. Why doesn't the retn instruction ...
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1answer
2k views

How do I decode this JavaScript code? [duplicate]

Each file starts with the same function: (function(_0x128f83, _0x1ae5b9) { var _0x1b5471 = function(_0x339be5) { while (--_0x339be5) { _0x128f83['push'](_0x128f83['shift']()); ...
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1answer
234 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, ...
0
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2answers
484 views

verifyError in youtube android app modification

I try to decompile youtube android application and modify it but when I build the application and install on a virtual device faced with below error: E/AndroidRuntime(1782): java.lang.VerifyError: ...
3
votes
1answer
199 views

IDA pro obfuscation instance

I have tried all the I have learned so far to figure out how to deal with this instance of obfuscation. So far I understand that an opaque predicate is present, causing an unconditional jump to one ...
3
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1answer
322 views

Deobfuscating overlapping x86 assembly instructions

I'm trying to solve a reverse engineering challenge (http://crackmes.cf/users/beatrix/beaba/) and am having trouble with the obfuscation. Below is a piece of code that gets executed almost immediately ...
3
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3answers
1k views

Exe protection by TLS callback, trying to understand the behaviour

I have an app, obfuscated by FSG protector. When i tried to unpack it, the first thign that i had is, when i start the process with the debugger/or attach debugger later, i immediatly receive ACCESS ...
0
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1answer
351 views

ARM ELF Obfuscation [closed]

Metamorphic is a technique to obfuscate a binary and change the opcode sequence and create new samples with same functionality. In my case, I have some elf binary of ARM processor type and their ...
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2answers
192 views

reverse javascript crackme encryption method algorithm

This crackme contains a text input element on the screen and a button to validate The value you enter is set into _inputValue, afterwards you click on a button, the function executes, in the last ...
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2answers
346 views

Techniques to hide a process (procmon)? [closed]

On Windows, how would one go about hiding procmon from another process? What techniques/terms would I be searching for?
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0answers
630 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 ...
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1answer
126 views

How does the different types of executable packing work?

Reference to this thread: What are the different types of packers? Q1: How do packing methods like compression, protection, and encryption work, how do they differ, and which is more secure? Q2: ...
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0answers
81 views

How to hide / obfuscate the function of an IC?

Let's say I have an IC (integrated circuit) and I want to hide it's function. What would be best practice to do that? Removing the markings with sandpaper or acid? (E.g. atmega328, ATtiny85,... ) ...
8
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2answers
693 views

Is there a name for this kind of “obfuscation” for the machine code from C++?

I was trying to reverse engineer an android ndk (arm) using ida pro on a static analysis. However, it appears there are a lot of useless jumps to the same place and with random values set to R1 to ...
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2answers
486 views

Android App's hardcoded local keystore password r3versing

Novice Android security researcher here. Recently I was tasked with the task/challenge of exposing a certain app's hardcoded local keystore password. I've decompiled it with JEB2 and obviously within ...
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1answer
80 views

What do the unusually named packages and files usually mean?

When decompiling an apk with apktool, the classes.dex file is decompiled into folders smali_classes#, and sorted their respective packages. I recognize some of the files, as they are mentioned in ...
2
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1answer
83 views

Unkown Swap Encoding

I'm trying to figure out this encoding in malware.. All I have are the static strings.. I was able to figure one out so there is plaintext on one: e-snAetgrU$ translates to $User-Agent Here are ...
2
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1answer
222 views

Distribution of malware obfuscation types

There are several statistics and numbers out there of current malware families and their distributions. However, I'am looking for statistics which shows the distribution of malware differed by their ...
1
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2answers
171 views

Obfuscation by changing the order of a malware behaviour

I know that there are some obfuscation techniques which can lead to slowing or even failing the detection of malware when static analysis is used. However, is there a similar technique that changes ...
1
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0answers
272 views

Discovering byte array obfuscation function

I'm in the middle of reverse engineering SafeNet (formerly Rainbow) iKey 1000 USB dongle protocol, in order to create Linux driver for it. I'm using Windows as guest in virtual machine on Linux host ...
1
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1answer
3k views

How to obfuscate x86 assembly code?

For my project, I am performing a kind of checksum operation on a portion of code to protect it and therefore do not want its template to be easily visible and therefore need obfuscation. I have ...
1
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1answer
595 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 ...
2
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1answer
1k views

Any good deobfuscators for java?

So I've built an obfuscator for java source code, would anyone know if there is any good deobfuscators which i could test how well my obfuscator is? I know there are many deobfuscators out there, ...
2
votes
2answers
452 views

Unpacking NSPack v 2.9 based malware to get OEP

recently i am analyzing a malware which is packed with NSPack. when i am trying to unpack it using this blog link,i landed over two instruction PUSHFD,PUSHAD in ollydbg. so i put a breakpoint on the ...
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0answers
62 views

Java source code deobfuscator? [duplicate]

Does anyone know of any source code deobfuscator in java? I'm currently writing an obfuscator for java source code and I want to test how well I have made it with an deobfuscator.
5
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1answer
1k views

Obfuscated AES decryption assembly

I have recently been sifting my way through a whole load of assembly to try to identify how a program is decrypting some data. Thus far I have identified how the IV is extracted, that the IV is 16 ...
2
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0answers
321 views

Jar reversing: Can't open as zip file nor open it with common decompilers

I'm pentesting a JNLP application composed by several .jar files. I'm able to decompile with jd-gui every 3rd party library included in it, but the main .jar coded by my client. So after running JD-...
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1answer
3k views

How to deobfuscated javascript?

How to deobfuscate javascript file, i have a javascript code are deobfuscate . Code: http://pastebin.com/zFH2GidN Help me and thanks you.
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0answers
71 views

Encrypting and packing at functional boundaries for obfuscation

I am interested in software obfuscation techniques. I found your excellent summary of obfuscation in order to avoid (as possible) reverse engineering. One of the proposed technique you quoted: ...
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3answers
1k views

How does PeID calculate entropy?

I'm curious about the entropy field value that shows up when a binary is dropped into PeID. Does someone know how it arrives upon this value?
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2answers
556 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
3k 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 ...
6
votes
2answers
2k views

How are obfuscators detected?

I'm guessing that tools like PeiD detect packers by looking for signatures inside the packed binary and by measuring the entropy. Is there any other work that tries to determine if a binary is ...