Questions tagged [.net]

The .NET framework is a software framework designed mainly for the Microsoft Windows operating system. It includes an implementation of the Base Class Library, Common Language Runtime (commonly referred to as CLI) and Dynamic Language Runtime. It supports many programming languages, including C#, VB.NET, F# and C++.

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What obfuscator is used?

In version 3.7.3.7 I was able to modify some parts of the code using dnSpy. The language is C#. But in the new(next) version, I did not succeed and I guess the code is obfuscated. De4dot did not help. ...
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Failed to load .net binary on IDA Pro

I tried to use IDA Pro to load a binary file. IDA detected it as a .NET file: but when I click OK to load the program, the following error occured, and the program can't be loaded: I tried to google ...
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1answer
77 views

Disassemble and debug dynamic generated code executed via delegate in c#

I'm trying to reverse engeneer a malware using dnSpy that at some point do this: delegate IntPtr H7IREAEBYY(string path, IntPtr data); byte[] array = new byte[] { 233, 151, ... } IntPtr value ...
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1answer
47 views

Structure of operand bytes in .NET call and data access IL instructions?

I tried googling but couldn't find any good source that explains the structure of memory access instructions like ldstr and call instructions for example based on experience, the last byte of API/...
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368 views

Deobfuscating Unknown C# obfuscator?

Hello, I am having an exe file that I am trying to deobfuscate and debug using dnspy. The exe file was written in C# and obfuscated with unknown deobfuscate according to de4dot! I tried to all my ...
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47 views

.NET - What kind of obfuscation is this?

I'm currently performing some malicious DLL malware analysis, and I'm having some issues figuring out how to de-obfuscate this particular sample. It uses a lot of Reflective Assembly calls, and, a lot ...
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1answer
49 views

Determine Control-Flow Of A .NET Assembly?

Using DnSpy is great, but it's very awkward to ascertain the control-flow of an executable. Is anyone able to advise on free-of-charge helpful apps that display a control-flow graph? IDA Home does not ...
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0answers
78 views

How To Deobfuscate ConfuserEx .NET Assembly?

No matter what I try I cannot deobfuscate this crackme https://crackmes.one/crackme/5d6c847433c5d46f00e2c390. I have tried each & every tutorial on youTube of which this one is the best https://...
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1answer
149 views

How to know where a sequences of bytes are used in a .NET application with Dnspy?

There are a sequence of bytes that i need to find out where are used in dnspy i tried going to hex editor and found the bytes, but right clicking and saying go to code or structure or follow reference ...
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133 views

What are the known techniques used by wrappers and obfuscators to protect against decompiling?

I am NOT looking to make my application 99% safe, nor my goal is to prevent a a determined reverse-engineer to disassemble it, but simply is to protect my source code from lambda user with little ...
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1answer
77 views

I can't understand this algorithm

I'm trying to solve this challenge but I can't understand the algorithm. it takes the name and generate the serial with this algoritm private int Encrypt(string Input) { int num =...
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184 views

How can I debug a non-main .NET assembly using dnSpy?

I am performing a security assessment on a .NET application. dnSpy is a great tool to do this. However, I've reached a module which is not in the "main" section of the program... It is loaded by the ...
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1answer
233 views

Attach one debugger to a DotNet application, and a second one to a loaded DLL

I'm trying to reverse an application that is using a DLL that i'm interested in. I can properly disassemble the application itself with DnSpy, as it is a .Net application, and I can disassemble the ...
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1answer
223 views

ildasm on Linux: “original” ildasm.exe same as dotnet-ildasm?

I would like to use ildasm on Linux. The original one, that comes with the .NET SDK and can be found on Windows e.g. at c:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools\. I ...
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51 views

Extract .NET code from React Native for Windows

I'm interested in reversing a UWP program made using React Native for Windows. Once such applications are compiled, the logic is contained in one dll. After opening this dll into IDA, it appears ...
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131 views

reverse engineering obfuscated .net dll

I am decompiling a third party .NET dll which was obfuscated using codeveil my aim is to get full source code, I tried decompiling using dnSpy, JustDecompile & Reflector however it just shows the ...
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40 views

Is there a way to see 'imports' in a .NET binary?

Programs such as Detect It Easy or IDA can show functions and libraries (DLLs) imported by a binary in the case of C/C++ binaries. I have a collection of .NET malware that I'm analyzing and would like ...
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2answers
585 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/...
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2answers
1k views

How to debug a DLL written in .NET/C#?

I want to reverse engineer an application written in C#. I would like to set a breakpoint at a function and observe the input passed to it during the normal course of the application's functioning.
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0answers
25 views

.NET manifest resource format

Currently I'm writing a parser for .NET files and stuck on manifest resources. My main resources: Huge documentation Short summary For resource format I have found this project made in 2005, all ...
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0answers
43 views

Parse / statically analyzing .NET binaries using python

Which libraries do you use to parse and statically analyze .NET binaries? Is there a python module, or do I have to use a .NET library such as dnlib? Does it make sense to write a python wrapper for ...
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3answers
6k views

Unity game: Assembly dll embedded inside the exe

I'm trying to reverse engineer a game made with the Unity engine, and usually all of the games's scripts are in the files \<Game>_Data\Managed\Assembly-CSharp.dll and \<Game>_Data\Managed\...
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1answer
97 views

Is it possible to detect visual studio version in compiled .net assembly?

I have a .net exe file I want to find out which version of visual studio is used to compile the assembly.. Is there are any solution to find out the IDE version.?
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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 ...
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1answer
224 views

View Array Type in dnSpy

I'm debugging a .NET application and see a declaration of a local array: $ArrayType$$$BY05PAD $ArrayType$$$BY05PAD; I break on an instruction that uses data inside that (char*) array: num9 = <...
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1answer
117 views

Is there a way to see & keep track of registers in dnSpy?

Hello I am trying to see if there is a way to see & keep track of the IP, and other registers as you would in OllyDbg or x64Dbg?
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1answer
64 views

Identify ldfld reference in .NET when parsing GetILAsByteArray

I was experimenting with idea of decompiling a PowerShell cmdlet using reflection. While I got some basics seem to work, how do I resolve the value in OperandField, for example ldfld cmd in this ...
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0answers
59 views

.NET Method Tracing with Parameters

Is there a tool which can profile the .NET binaries (32-bit and 64-bit) during execution to generate an API trace providing details of the methods called and the parameters passed to each method? ...
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0answers
122 views

Re-engineering to create UML Diagrams from .NET binary assembly

What is the base way to generate UML diagrams (both class and sequence) from .NET assembly using OpenSource tools? The 200% Reflective Class Diagram Creation Tool cannot be used due on problems ...
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2answers
2k views

How to disassemble a packed .NET executable?

I'm trying to reverse a Windows executable that shows as having been packed with ENIGMA(5.X): If I later check the class name for one of its UI elements, when the process is unpacked and running, it ...
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0answers
30 views

How to tell when Cor20 starts for DLL's that are supposed to meet ECMA-335?

When I look at a .Net compiled DLL that is supposed to conform to ECMA-335, I see the PE Header well defined up to 0x1EF, but there seems to be block between 0x1F0 and 0x208 which is mainly 00's that ...
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0answers
364 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. ...
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2answers
902 views

.NET assembly IDA PRO, using LDSTR IL op code, how to patch a string?

I'm trying to patch a string. So right now I'm trying to replace instruction LDSTR with LDSTR "mystring"; however, I have been unsuccessful. After assembling the LDSTR op code, I don't quite ...
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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 ...
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2answers
3k views

android unity intercept w/ Frida

I'm trying to extract symbols from an Android Unity game to detect something related to the game which I can intercept and replace variables. The following code will enumerate symbols from libmain.so,...
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0answers
96 views

Decompiling DotNet2JScript malware?

I've got a .NET malware sample that was transpiled to JScript using DotNet2JScript. The .NET malware assembly was serialized to binary form using BinaryFormatter and then embedded into the JScript ...
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1answer
3k views

dnSpy - What do these symbols mean?

When decompiling a dll file there are certain lines of code that read like this: return \u0013.\u0002.\u0001(url, info); I have two questions on this: 1) does \u00xx mean that it is obfuscated, if ...
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2answers
3k views

.NET: It's possible to recover original source code from compiled .exe when I have all the .vshost, .pdb and compiled files?

I have the compiled code with all .pdb, vshost and everything that is generated. I am already using DotPeek without too much hassle. Would like to know If I can retrieve the original code with all the ...
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1answer
571 views

How to tell if a particular .NET assembly was written in C# or F#?

The motivation for this question is that I used JetBrains dotPeek to decompile an .exe written in F#, but the output project directory produced C# code. Why does decompiling an F# assembly produce C# ...
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0answers
2k views

View static field values in dnSpy

I'm using dnSpy (version: 4.5.3) to debug a .NET binary. I can successfully view the values of Local variables in the Locals window but I cannot view the values of static fields. However, per this ...
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1answer
809 views

How to find the name of the method in Managed Code using Windbg and SOS?

I've got a crash dump, the application definitely crash in JIT optimized assembler code. I know the start address of the method. How do I find its name using using Windbg and SOS extension? Currently ...
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1answer
1k views

Unable to unpack heavly obfuscated malware

I'm trying to unpack malware packed with ConfuserEx 1.0.0 and I can't seem to get it to work. Each time I remove the anti-tamper the whole file gets corrupted. I tried all possible tools that I found ...
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1answer
518 views

How to deobfuscation the public class names .NET

I already try de4dot with all dlls and exe and try remove strong name and don't work. what am I doing wrong?
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1answer
915 views

Reverse engineering of Managed C++/C# CrackMe

I'm reverse engineering the CrackMe which is written on Managed C++/C#. Arguments are "string" (email in this case) and "serial". Serial is somehow depends on string and I need to understand how. I ...
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1answer
198 views

Modified dll works as original without debugger attached

I'm trying to make some changes to .Net dll (note: dll is mixed mode module) used by an exe, ProtectionID detected nothing, so I happily jumped into dnSpy and made changes. I ran executable with ...
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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 ...
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2answers
171 views

Do .NET functions have function prologs?

If I'm looking at a binary compiled with VC++ in a hex editor and I want to identify the start of functions - I can look for the hex "55 8B" - which is a common function prolog. Is there something ...
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0answers
487 views

Is there an existing tool to reverse engineer Xamarin AOTDATA files?

I am currently examining a xamarin application. It has used the "ahead of time compilation" feature, which has left some of the associated .net assemblies (.dlls) as lists of function signatures ...
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2answers
890 views

Trying to call a function in an unknown DLL

My goal is far from nefarious. After several polite attempts to try and get Lenovo to implement a proper keyboard backlight control, I've had no response. They do have a Windows Store app which adds ...
3
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1answer
817 views

Modifying a string in a .net binary

I have a .net exe called foo.exe I open foo in a hex editor (HxD) and search for myString. I do not see it. I open foo.exe in ILSpy and was able to find myString. I do see human readable text in the ...