Questions tagged [obfuscation]
Concealing the nature of how things truly function or work.
133
questions
0
votes
0answers
25 views
What type is this obfuscation ? (iOS Dylib)
Someone published a patch/crack for my iOS app. I wanted to know what does the dylib but it seems to be heavily obfuscated (all strings are obfuscated too).
You can see some screenshots below.
Can ...
1
vote
1answer
45 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
...
-2
votes
0answers
47 views
Which obfuscation is this?
I want to know which obfuscation is this ? Is there anyone who knows it ? I tried Detect it Easy but no result. Is there any better Detection Program ?
0
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0answers
28 views
How to call strongly encrypted DLL from Resources?
There is a program. This program accepts plugins. Plugins written with C#. I have to encrypt it. But when I use strong obfuscators I have exception. Program doesn't read. How can I fix that ? How can ...
2
votes
0answers
53 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 ...
-1
votes
1answer
98 views
De-obfuscate JS code [closed]
I came across a script that converts font files from one type to another (i.e. WOFF to TTF, etc).
I would like to understand it and incorporate some of the code into a personal project. The script ...
2
votes
2answers
342 views
Dealing with heavily obfuscated Java, possibly on bytecode level
I've got a jarfile from a friend, he told me to put it thru an decompiler. So I did, but:
JD-GUI basically spit out just the imports and didn't show any class data
CFR dumped out stack trace on ...
1
vote
1answer
123 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 ...
1
vote
1answer
74 views
Python self decryption script, as mean of obfuscation
I have a software with an embedded python interpreter. The software can open upon startup a given .py script and execute it. Let's assume that in my python environment I can't open other files, and I ...
1
vote
1answer
185 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/...
0
votes
1answer
89 views
Error After de4dot - Application Does Not Start
There is an application that has been obfuscation to learn. So in an unpack me style. In the first stage I would unpack with de4dot. After you unpack, the running application stops working.
dump and ...
1
vote
0answers
42 views
Possibly infected image
Long story short I'v downloaded a template for my website and instead of images it has the .html files included, and at the beginning those html files do include PNG IHDR , and they are being loaded ...
2
votes
2answers
188 views
Static analysis obfuscated code
I'm reversing a code that is heavily obfuscated. It uses opaque predicates, call stack tampering, junk code and control flow flattering.
Call stack tampering uses indirect branches (push register / ...
2
votes
1answer
840 views
Best way to protect source code of .exe program running on Python?
I am developing proprietary software that would be distributed in a form of .exe file. In order to use it, users will have to authenticate with their whitelist credentials (username + password).
The ...
1
vote
0answers
71 views
API Hiding Issue
I'm trying to analyze a malware which is hiding API names. When I open it with CFF Explorer, except a few API like GetProcAddress, nothing appears. Basically, I know how API hiding works. I set a ...
0
votes
0answers
36 views
IDA Fails to Analyze Stack Pointer Correctly in Heavily Chunked Functions
I am currently dealing with obfuscated code in IDA.
The obfuscation I am combating is control flow obfuscation, where a function is split up into hundreds of basic blocks spread across the entire ...
1
vote
1answer
77 views
J2ME games obfuscator - Spyro and Tekken 5
While reversing some J2ME games like Spyro or Tekken 5 Mobile I have encountered a weird obfuscation where all fields, methods and classes have names like A, a, B, b, Aa, Bb etc.
It's really hard to ...
5
votes
2answers
303 views
Trace Method Calls in .NET/C# Binary
I have a heavily obfuscated Windows service binary. Fields, types and methods are renamed. While it is possible to decompile the binary using dnSpy, it is still very cumbersome to identify important/...
0
votes
0answers
331 views
Obfuscate JSON file that is served client-side
Through some research I have found that obfuscation won't block hackers from retrieving your .json file, but I'd like to have at least a level of obfuscation that deters some people. I ran into a npm ...
0
votes
0answers
39 views
obfuscating mprotect, or run-time alternative
For an anti-debug method, I need to make a stack page executable at run-time, but only briefly. I don't want to use mprotect() as it's easily located and tracing forward reveals the location of the ...
1
vote
0answers
163 views
Mysterious chunk of code in IOLI crackme0x06 challenge
I've been struggling to understand a very strange piece of x86 assembly code from the IOLI crackme0x06 challenge.
Context
But first of all, here is the context : I've successfully cracked the ...
0
votes
0answers
137 views
Reverse engineering .NET malware - iloveyou.exe
I have a .NET malware sample whose dynamic behavior I understand. It is also packed.
de4dot identified the obfuscator as .NET Reactor, so I used de4dot to de-obfuscate it. However, after de-...
1
vote
0answers
46 views
How to choose a .NET software protector which will have a small impact on run-time performance speed? [closed]
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 ...
0
votes
1answer
855 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 ...
2
votes
1answer
139 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
votes
2answers
315 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....
1
vote
1answer
269 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
424 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
vote
1answer
742 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 ...
1
vote
0answers
306 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
votes
2answers
419 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 ...
1
vote
1answer
461 views
What is the difference between stripped binary and obfuscated binary
I want to know the difference between stripped binary and obfuscated binary.
1
vote
0answers
1k 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 ...
4
votes
3answers
235 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
vote
0answers
61 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
2k 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 ...
2
votes
0answers
409 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
votes
2answers
228 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 ...
-3
votes
1answer
7k 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']());
...
1
vote
1answer
440 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
votes
2answers
909 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
393 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
votes
1answer
540 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
votes
3answers
3k 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
votes
1answer
539 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 ...
1
vote
2answers
248 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 ...
1
vote
2answers
580 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?
1
vote
0answers
885 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 ...
0
votes
1answer
199 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: ...
1
vote
0answers
98 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,... ) ...
