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Citat:How Regmon Works
The heart of Regmon on Windows 9x is in the virtual device driver, Regvxd.vxd. It is dynamically loaded, and in its initialization it uses VxD service hooking (see our May 1996 Dr. Dobb's Journal article on VxD service hooking for more information) to insert itself onto the call chain of 16 registry access functions in the Windows 95 kernel (Virtual Machine Manager). All registry activity, be it from 16-bit programs, Win32 applications, or device drivers, are directed at these routines, so Regmon catches all registry activity taking place on a machine.
On Windows NT, 2000 and XP the Regmon loads a device driver that uses a technique we pioneered for NT called system-call hooking. When a user-mode component makes a privileged system call, control is transfered to a software interrupt handler in NTOSKRNL.EXE (the core of the Windows NT operating system). This handler takes a system call number, which is passed in a machine register, and indexes into a system service table to find the address of the NT function that will handle the request. By replacing entries in this table with pointers to hooking functions, it is possible to intercept and replace, augment, or monitor NT system services. Regmon, which obviously hooks just the Registry-related services, is merely one example of this capability in action.
On Windows .NET Server Regmon takes advantage of a new operating system Registry callback mechanism to register for and receive information about Registry accesses as they occur. When you run Regmon on .NET Server it loads a version of the Regmon driver utlizing the callbacks.
When Regmon sees an open, create or close call, it updates an internal hash table that serves as the mapping between key handles and registry path names. Whenever it sees calls that are handle based, it looks up the handle in the hash table to obtain the full name for display. If a handle-based access references a key opened before Regmon started, Regmon will fail to find the mapping in it hash table and will simply present the key's value instead.
Information on accesses is dumped into an ASCII buffer that is periodically copied up to the GUI for it to print in its listbox.
For more detailed information on how Regmon works on Windows NT, see:
* "Windows NT System Call Hooking," by Mark Russinovich and Bryce Cogswell, Dr. Dobb's Journal, January 1997
* "Inside NT Utilities", Windows NT Magazine, February 1999.
http://www.sysinternals.com/Utilities/Regmon.html
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