Questions tagged [dll]

Dynamic-link library, or DLL, is Microsoft's implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems.

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Proxy dll doesn't load the original dll

I have relatively simple code here for the proxy DllMain() function: BOOL APIENTRY DllMain(HMODULE hDll, DWORD reason, LPVOID reserved) { if (reason != DLL_PROCESS_ATTACH) { return TRUE; } ...
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What's the meaning of @ tag on proxy dll?

In proxy dll in .def file I can see the following notation: _CreateFrameInfo=PROXY__CreateFrameInfo @1 Others use in the following format: _AIL_3D_position@16 = vcruntime140_._AIL_3D_position@16 ...
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How to modify a function without disassembling the entire class

If I want to modify a function which has calls to other classes and functions in the application, but I don't want to reverse all of those other classes and leave them as they are, how do I go about ...
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163 views

How to disassemble an obfuscated .NET DLL?

I asked earlier about unpacking a packed .NET exe. But now I need to see the source code for an obfuscated DLL: Any idea how to unpack it?
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The method of searching for similar code in a binary file of a new release

Got into the hands of such a task. There are two dlls. As the second file was explained to me (new.dll) this is a new release of the first file (old.dll). Both files are compiled for x64. I need to ...
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63 views

Why rundll32.exe could be loading a DLL multiple times?

Since I started reverse engineering I've found multiple DLLs that when being debugged(IDA + WindDBG) would be unloaded and reloaded continuously without any evident reason. Most of the time I use ...
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64 views

How to mark data as pointer to external functions in ghidra

I'm examining a piece of malware with Ghidra, and like most malware it uses LoadLibrary and GetProcAddress to dynamically load libraries and functions. GetProcAddress stores the function addresses in ...
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Why can C# applications be reverse-compiled with variable names while C++ ones can't?

Why can programs written in C# be reverse-compiled essentially to their original form with variables names (such as dnSpy) while C++ decompilers (such as Ghidra) are unable to decode the variable ...
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How to retrieve the encryption key from a dll file?

I have a dll file that makes an http post request to a webserver , request looks something like this : UmdUsFrEB3wGMuuAz1Znywuedx6+...
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42 views

Editing assembly language to bypass the condition

I want to edit the compiled DLL code to bypass the variable checking condition. I tried to change the value in the condition but it causes an application crash. How can I "remove" this ...
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72 views

Add new bytes into DLL file

I have a source code of dll file from IDA Disassembler and Hex Editor. Now i want add new bytes (not overwrite). https://imgur.com/VtAK4sw I would like to add support for a new version of the ...
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41 views

c# - Eject Injected Dll From Proc. Then Re-Inject Capability

I made a simple c# application to inject .dll to given process. But I also want to have a capability to eject then depending on user's choice, can re-inject the same .dll to same process. I'm working ...
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45 views

When is a wide-character function called?

I am rather new to reversing and currently I am trying to reverse and understand one of the malware samples that seem to be used by DPRK actors to target security researchers. https://norfolkinfosec....
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59 views

FINDING & EXECUTING a function from an exe/dll (not compiled by me)?

my Problem is, i have bought a Huion Kamvas 22 Plus pen display for drawing and painting. On my old Wacom tablet i had some hardware buttons and could map functions/setting of the driver to these ...
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1answer
54 views

open decompiler view of current module (dll) in dynamic analysis

I have a program (P.exe) with several dependencies (A.dll, B.dll etc). I decompiled and studied B.dll, but at runtime, P.exe is using A.dll. The horizon is updating in ISA view-RIP, but I don't have ...
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273 views

How do I execute "File -> Add To Program..." in a Ghidra script?

I'm reversing an old video game with large number of shared libraries, and in order to reference them all correctly (via "thunk" functions?) I think I need to import all of the raw files ...
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2answers
63 views

Cannot disassemble exported functions

I want to disassemble a function from Kernel32.dll to see what it does, but every single function I try looks like this in the decompiler: Function: jmp ds:Function_0 Where is the function? ...
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77 views

Adding an export entry into dll file

There is an dll file which i need to edit, Using PE Explorer option, Export Viewer i can see a long list of items and i suppose each entry is called "Export Function". Using notepad++ i can ...
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389 views

Rebuild IAT after manually unpacking DLL

I've been trying to unpack this dll and I'm pretty sure that 0x7c3ea902 or 0x1007A9D2 (ASLR disabled) or simply 0x7A9D2 is OEP. But after dumping with OllyDumpEx and trying to fix IAT with ImpREC it ...
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Error 0xc00007b while trying to do DLL Proxying

I have been trying to do DLL Proxy to load my code on a target process. The dll I'm building is just the sample template that comes with Visual Studio. I've just added the function exports and a ...
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1answer
89 views

Statically recovering thunks in Windows x86_64 DLL

I just started working my way to reversing Windows binaries and I stumbled upon the Import Address Table. When reversing a particular DLL I encountered many thunk-functions which all supposedly ...
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77 views

how can ı debug encrypted dll with x32dbg and look getregistery request

I have an executable with 2 .dll calls 1 of this dll is guard.dll others name is guardlib.dll both of them is encrypted c++ library file and they are called before executable entry point. I can bypass ...
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78 views

How do you recommend going for applying minor changes in an executable through a dll?

My choice of words in the title might be poor, I apologize: english is not my primary language and I have no idea how to word it better. I have a game executable to which I applied several changes, ...
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1k views

Getting Ghidra project to recognize referenced DLL

I am reverse engineering a very old game and when I load up the executable in Ghidra, I see a handful of imported dlls I do however not see one of the DLLs the game uses to wrap various client ...
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ILSpy edits wont save .dll

(I'm on mac btw) So I want to try game hacking, and I've done some research. So I made a simple unity first-person shooter and built it, and I went into the files and found Assembly-Csharp.dll and I ...
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x64dbg how to find name of DLL not found

I have a program that hangs at start on my Window 10 system but runs ok on a VM running a vanilla Windows 10 system. Using x64dbg I get to an error where it states a DLL is not found. I have been ...
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52 views

Debug dll file used in python script IDA

I am fairly new to RE on windows. I have a python script which via ctypes uses functions from a dll. I don't know if it's possible, but I would like to debug the dll used in the python script (the dll ...
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56 views

Can I reverse engineer a DLL file and add SEH or some error handing codes to it?

I am using some DLL files in my Java application using JNI library. The dlls are not written by me and I do not have access to their source codes. They are so buggy and throw lots of exceptions. ...
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214 views

Is there a way to view the complete "Additional Information" log of Ghidra's "Import Results Summary"?

I'm currently trying to look into Q.U.B.E. 2's internal mechanics, so I decided to look at it using Ghidra. Q.U.B.E. 2 is built upon UnrealEngine, so it it's pretty big (~50 Mb's). However, when ...
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157 views

what routine in ntdll.dll is responsible of dispatching DllMain function of loaded dll?

I'm trying to debug a dll file using Ida disassembler and Windbg. I'm debugging rundll32.exe and passing the target dll (debugee) as an argument. I'm able to have a breakpoint on each Dll load & ...
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49 views

Specifying DLL imports within the PE?

I have unpacked and dumped a dll that uses a custom IAT to resolve Win32 API calls (143 of them). Is there anyway to modify the dumped dll PE to include these imports dynamcially and forward their ...
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2answers
293 views

How to decompile "call eax" in IDA Pro?

I know that there is a similar question but the answers didn't provide any fix for that problem. I am decompiling a .dll file, and I have found out the subroutine that I needed, but it's throwing a "...
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246 views

Loading a PE32 executable DLL Intel 80386 into a c# program

I'm new here so I'm sorry if this isn't the right section for my question. I'm reverse engineering a software that's written in .net 3.5 c# which loads a weird dynamic dll, which has an important ...
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3answers
237 views

How does an application identify a DLL file

Sorry if this is a basic question, as I'm very new at this. I'm trying to get an .exe to load a dummy .dll. I've created an example .dll project in VC++ 2019, added the functions listed in the .exe's ...
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2answers
98 views

Access DLL PE file by PEB dllbase address

I got the dllbase address from PEB InMemoryOrderModuleListItem list and I am trying to access the PE dos header file of a DLL. I am new to reverse engineering and in the past, I accessed the dos ...
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50 views

Develop a Hello World plugin for Ollydbg

I wanted to write a plugin for Ollydbg 2 which shows just a simple message. I write the following one but it doesn't load in ollydbg. I am using ollydbg 2 and my DLL can't load by it. Where is the ...
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1answer
403 views

c++ reading process memory with injected DLL

The reading works fine until it reaches base+27.058.176(bytes) address. At this address VirtualProtect() failes with error 487 (Attempt to access invalid address). Why does it return this error? Btw ...
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2answers
195 views

Function Prologue, add esp directive

I need to see how a DLL was written and I am using a x32dbg to do it at run-time. I am a newbie to this reversing stuff, so I am confused with this piece of code: push ebp ;...
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1answer
801 views

Reverse engineer Listen to this device on Windows - Reverse engineer Windows when there's no API

I'm writing an Autohotkey script to toggle Listen to this device for my microphone, without interacting with a GUI. I thought it would be a simple registry key being modified so I used RegShot to ...
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85 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 ...
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1answer
421 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
942 views

Ghidra can't Decompile kernelbase.dll exported functions?

I was trying to understand the IsDebuggerPresent() function exported by kernelbase.dll by importing the file on Ghidra. But Ghidra can't show me the proper disassembly or decompilation of function ...
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196 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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1answer
247 views

mfc140 dll , what is the usage?

While I open exe file in ida I can see lot of calls to mfc140_6153 or mfc140_8718. What are those functions ? what they do ? thanks
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X32DBG ignores dependent DLL

I have EXE file which calls one specific DLL among other system DLLs. When I change a string value in this specific DLL I can see the changes when I execute the EXE file. For example I can change text ...
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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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1answer
420 views

Start vs WinMain()

I am trying to analyze a malicious DLL and when I loaded it in IDA, I can see two functions - DLLEntryPoint and DLLMain. I then proceeded to change the format by switching the characteristics bit that ...
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1answer
273 views

DLL obfuscator - what kind of obfuscator is this?

when I am looking for packet editor, I found open project on http://www.packeteditor.com/ when I learn how it works, I see that the application is injecting a dll named WSPE.dat, when I load this WSPE....
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86 views

Exported DLL function has only stdcall with some offset

I am quite new to reverse engineering. I have opened .dll (x86) in IDA Pro and I have noticed few exported functions. The issue is that all of them looks like this: IDA pseudocode: int __stdcall ...
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3answers
11k 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\...