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The current article is devoted to an easy approach for setting up global API hooks on a system-wide scale. For DLL injection, we will utilize a registry key called AppInit_DLLs, and to perform API hooking in Windows, we will utilize the Mhook library. This article will also provide you a DLL injection example: we will demonstrate how you can easily make the calc.exe process invisible in the running process list.
Author:Sergey Podobriy,Leader of Driver Team
Contents:
About API hookingAPI hook typesApplint_DLLsMhook libraryImplementation exampleSource functionFunction after hookingWindows hook set upUnhookingAPI hooking sample executionLimitationsReferences
About API hooking
Windows API hooking is a process allowing to intercept API function calls. This gives you the control over the way operating system or a piece of software behaves. Some of the software solutions that utilize hooks include: antimalware software, application security solutions, security monitoring tools, system utilities, tools for programming, and many others.API hook types
API hooks can be divided into the following types:
*Local hooks: These influence only specific applications.
*Global hooks: These affect all system processes.
The type of hook technique for Windows that we cover here belongs to the global type. It affects all processes across all sessions (as opposed to the SetWindowsHooks method, which is limited only to a selected desktop).AppInit_DLLs infrastructure
The AppInit_DLLs infrastructure loads a predefined set of DLLs to all user-mode processes connected with the User32.dll library (in fact, there are almost no executables, which wouldn’t be connected with it). When User32.dll is initialized, it loads the corresponding DLLs, thus performing the DLL injection into processes.
To change the way the AppInit_DLLs infrastructure behaves, you need to configure the HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NT CurrentVersionWindows registry key values. The following values are available:ValueDescriptionSample valuesLoadAppInit_DLLs (REG_DWORD)Allows you to switch AppInit_DLLs on or off on a global scale.0x0 disables AppInit_DLLs 0x1 enables AppInit_DLLs
AppInit_DLLs (REG_SZ)Allows you to specify the list of DLLs for loading. The items must be separated either by commas or spaces. To specify the full path to a DLL, use short file names.C:PROGRA~1TestSample.dllRequireSignedAppInit_DLLs (REG_DWORD)Allows you to limit the range of DLLs only to code-signed ones.0x0 allows loading of any DLLs 0x1 allows loading of only code-signed DLLs.Mhook libraryTime Slot Informatica App
Several API hooking libraries exist. Typically, they do the following:Time Slot Informatica Game
*Replace the initial part of a defined function code with our own code (also known as trampoline). Upon execution, the function jumps to a hook handler.
*Store the original version of the replaced code of the defined function. This is required for the defined function to operate properly.
*Restore the replaced part of the defined function.Time Slot Informatica Software
As I mentioned before, when building our global hooks, we will use Mhook library. It is a free and easy-to-use open-source library for Windows API hooking supporting x32 and x64 system architectures. Its interface isn’t complicated and is self-explanatory:
Register here: http://gg.gg/p0ev3
https://diarynote.indered.space
Ask An Expert is a unique channel for our customers to engage directly with Informatica subject matter experts. Customers can use the dedicated time (up to 45-minutes) to discuss best practices, product roadmap, understand product features, functionalities, and other use cases within the scope of support. The next video is starting stop.
*Time Slot Informatica App
*Time Slot Informatica Game
*Time Slot Informatica Software
The current article is devoted to an easy approach for setting up global API hooks on a system-wide scale. For DLL injection, we will utilize a registry key called AppInit_DLLs, and to perform API hooking in Windows, we will utilize the Mhook library. This article will also provide you a DLL injection example: we will demonstrate how you can easily make the calc.exe process invisible in the running process list.
Author:Sergey Podobriy,Leader of Driver Team
Contents:
About API hookingAPI hook typesApplint_DLLsMhook libraryImplementation exampleSource functionFunction after hookingWindows hook set upUnhookingAPI hooking sample executionLimitationsReferences
About API hooking
Windows API hooking is a process allowing to intercept API function calls. This gives you the control over the way operating system or a piece of software behaves. Some of the software solutions that utilize hooks include: antimalware software, application security solutions, security monitoring tools, system utilities, tools for programming, and many others.API hook types
API hooks can be divided into the following types:
*Local hooks: These influence only specific applications.
*Global hooks: These affect all system processes.
The type of hook technique for Windows that we cover here belongs to the global type. It affects all processes across all sessions (as opposed to the SetWindowsHooks method, which is limited only to a selected desktop).AppInit_DLLs infrastructure
The AppInit_DLLs infrastructure loads a predefined set of DLLs to all user-mode processes connected with the User32.dll library (in fact, there are almost no executables, which wouldn’t be connected with it). When User32.dll is initialized, it loads the corresponding DLLs, thus performing the DLL injection into processes.
To change the way the AppInit_DLLs infrastructure behaves, you need to configure the HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NT CurrentVersionWindows registry key values. The following values are available:ValueDescriptionSample valuesLoadAppInit_DLLs (REG_DWORD)Allows you to switch AppInit_DLLs on or off on a global scale.0x0 disables AppInit_DLLs 0x1 enables AppInit_DLLs
AppInit_DLLs (REG_SZ)Allows you to specify the list of DLLs for loading. The items must be separated either by commas or spaces. To specify the full path to a DLL, use short file names.C:PROGRA~1TestSample.dllRequireSignedAppInit_DLLs (REG_DWORD)Allows you to limit the range of DLLs only to code-signed ones.0x0 allows loading of any DLLs 0x1 allows loading of only code-signed DLLs.Mhook libraryTime Slot Informatica App
Several API hooking libraries exist. Typically, they do the following:Time Slot Informatica Game
*Replace the initial part of a defined function code with our own code (also known as trampoline). Upon execution, the function jumps to a hook handler.
*Store the original version of the replaced code of the defined function. This is required for the defined function to operate properly.
*Restore the replaced part of the defined function.Time Slot Informatica Software
As I mentioned before, when building our global hooks, we will use Mhook library. It is a free and easy-to-use open-source library for Windows API hooking supporting x32 and x64 system architectures. Its interface isn’t complicated and is self-explanatory:
Register here: http://gg.gg/p0ev3
https://diarynote.indered.space
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