Let's take a look at the following program that calls the NtOpenFileįunction directly. In the following article, we'll take a look how to actually do Obtain their addresses via the GetProcAddress function and call them If we want to call those functions nevertheless, we need to The problem is that some of the functions cannot be called directlyīecause they are not exposed and are only used internally by the library NtOpen, and the NtOpenFile function is among the listed functions. On the picture below, we can see all of the names that start with Let's dump all the entries from theĬ:exports.txt file whose names start with NtOpen. Stumble upon the NtOpenFile function that is part of the ntdll.dll This is that only some of the functions are actually exported, but someĪre hidden and cannot be called directly by the program. Value addresses where the functions can be accessed.

Next are the ordinals, names and their relative The function names from, and also lists the number of functions, which

Notice that the dumping first presents the DLL file that we're dumping Now we can open the C:exports.txt file and observe

On the pictureīelow, we can see that we've passed the /EXPORTS parameter to theĭumpbin command, which dumps all the exported functions and pipes them If we start the Visual StudioĬommand Prompt, we can use the dumpbin command to display all of theĮxported functions available in the ntdll.dll library. Internal ntdll function that isn't exported and easily callable, right? If you're reading this, then you've probably wanted to call some

Dll reverse engineering