Hook Windows Api
I am learning to write hooks for Windows API and for exercise I am writing a hook for pDeleteFileA function. When the function will get called, before deleting the file I want to check whether file's name is 'testfile.txt' if yes then instead of deleting it a message will pop up and if its called something else then proceed deleting the file. Apr 06, 2002 General design of an API spying framework Usually a Hook system is composed of at least two parts - a Hook Server and a Driver. The Hook Server is responsible for injecting the Driver into targeted processes at the appropriate moment.
- Hook Windows Api C#
- Dll Injection Example
- Hook Windows Api Software
- Delphi Hook Windows Api
- Hook Windows Api Functions
May 31, 2013 We must understand that there are various methods to hook an API: Overwriting the address of the function with the custom function’s address. Injecting the DLL by creating a new process. This method takes the DLL and forces the executable to load it at runtime, thus hooking the functions defined in the DLL. Feb 02, 2019 Mhook - a Windows API hooking library. Introduction; How to use; License; Version history; Acknowledgements; Introduction. This library was created as a free alternative to Microsoft. Windows API hooking is one of the techniques used by AV/EDR solutions to determine if code is malicious. You can read some of my notes on bypassing EDRs by leveraging unhooking - Bypassing Cylance and other AVs/EDRs by Unhooking Windows APIs.
Hook Windows Api C#
I am learning to write hooks for Windows API and for exercise I am writing a hook for pDeleteFileA function. When the function will get called, before deleting the file I want to check whether file's name is 'testfile.txt' if yes then instead of deleting it a message will pop up and if its called something else then proceed deleting the file.
Dll Injection Example
I have written some code already and the code compiles without any errors but when I try to delete 'testfile.txt' it is just being deleted. Maybe someone could give me a hint what I am doing wrong or what I am not doing?
Here is my code so far:
1 Answer
Each process has it's own address space.
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Each process loads it's DLLs separately and has separate memory. So if you try to overwrite memory - you're overwriting just a copy of DLL that is loaded into your process. This is done for stability and security reasons.
To owerwrite memory and execute code in another process - you need to use DLL Injection, wiki has good overview of scenarios and methods.
So you need to place your code into DLL, then load this DLL into target's process. Then your DLL in it's DLLMain will overwrite function for this process (the hook code). It also means that hook code will run in context of hooked process, so MessageBox or printf might not work as expected.
Hook Windows Api Software
Also I highly recommend to use second PC with remote debug or VM, because hooking system processes may cause instability.
Delphi Hook Windows Api
Edit: some more notes. You're trying to hook DeleteFileA, which is ASCII version and newer software will use DeleteFileW instead.
Edit2: also you can't load 32 bit DLL into 64 bit process and vice versa.