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API hooking revealed

, 2 Dec 2002 CPOL
The article demonstrates how to build a user mode Win32 API spying system
//---------------------------------------------------------------------------
//
// NtProcessMonitor.h
//
// SUBSYSTEM: 
//				API Hooking system
// MODULE:    
//				Implements a thread that uses an NT device driver
//              for monitoring process creation
//
// DESCRIPTION:
//
// AUTHOR:		Ivo Ivanov (ivopi@hotmail.com)
//                                                                         
//---------------------------------------------------------------------------

#if !defined(_NTPROCESSMONITOR_H_)
#define _NTPROCESSMONITOR_H_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "..\Common\LockMgr.h"

//---------------------------------------------------------------------------
//
// typedefs
//
//---------------------------------------------------------------------------

// Structure for Process callback information
typedef struct _CallbackInfo
{
    HANDLE  ParentId;
    HANDLE  ProcessId;
    BOOLEAN bCreate;
} CALLBACK_INFO, *PCALLBACK_INFO;

//---------------------------------------------------------------------------
//
// Forward declararion
//
//---------------------------------------------------------------------------

class CNtDriverController;

//---------------------------------------------------------------------------
//
// class CNtProcessMonitor
//
//---------------------------------------------------------------------------
class CNtProcessMonitor  
{
public:
	CNtProcessMonitor();
	virtual ~CNtProcessMonitor();
	//
	// Activate / Stop the thread which gets the notification from the 
	// device driver
	//
	void SetActive(BOOL bVal);
	HANDLE Get_ShutdownEvent() const;
	HANDLE Get_ProcessEvent() const;
	//
	// Retrieves data from the driver after received notification 
	//
	void RetrieveProcessInfo(
		CALLBACK_INFO& callbackInfo,
		CALLBACK_INFO& callbackTemp
		);
protected:
	virtual void OnCreateProcess(DWORD dwProcessId) = 0;
	virtual void OnTerminateProcess(DWORD dwProcessId) = 0;
private:
	BOOL Get_ThreadActive();
	void Set_ThreadActive(BOOL val);
	static unsigned __stdcall ThreadFunc(void* pvParam);

	CNtDriverController* m_pDriverCtl;
	CCSWrapper           m_CritSec;
	HANDLE               m_hShutdownEvent;
	HANDLE               m_hProcessEvent; 
	BOOL                 m_bThreadActive;
	DWORD                m_dwThreadId;
	HANDLE               m_hDriver;
};

#endif // !defined(_NTPROCESSMONITOR_H_)
//----------------------------End of the file -------------------------------

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Ivo Ivanov
United States United States
I specialize in OS Internals and Reverse Engineering.
Before joining my current employer I used to run a security blog for malware analysis: http://vinsula.com/security-blog

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Article Copyright 2002 by Ivo Ivanov
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