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Locates the DLL containing the function. Loads the DLL into memory. Locates the address of the function in memory and pushes its arguments onto the stack, marshaling data as required. P/Invoke is useful for using standard (unmanaged) C or C++ DLLs.
Each function exported by a DLL is identified by a numeric ordinal and optionally a name. Likewise, functions can be imported from a DLL either by ordinal or by name. The ordinal represents the position of the function's address pointer in the DLL Export Address table. It is common for internal functions to be exported by ordinal only.
These normally have reliable and non-conflicting addresses. So the copied DLL can use any kernel32.dll calls, f.e. to load another DLL with full advantages of a locally loaded DLL, i.e. having all relative library-dependencies. The path to that DLL is copied to the foreign address space and given as a void-parameter to the thread-function.
COMCTL32.DLL implements a wide variety of standard Windows controls, such as File Open, Save, and Save As dialogs, progress bars, and list views. It calls functions from both USER32.DLL and GDI32.DLL to create and manage the windows for these UI elements, place various graphic elements within them, and collect user input.
The code is compiled into a DLL file then loaded into the target process using any method of DLL injection. Using a backup of the original function one might then restore the first six bytes again so the call will not be interrupted. In this example the win32 API function MessageBoxW is hooked. [2]
C# provides type-safe object-oriented function pointers in the form of delegates. class Program { // Delegate type: delegate int Operation ( int a , int b ); static int Add ( int i1 , int i2 ) { return i1 + i2 ; } static int Sub ( int i1 , int i2 ) { return i1 - i2 ; } static void Main () { // Instantiate the delegate and assign the method to it.
Another method is relative path DLL hijacking, which moves the vulnerable program to a location together with the malicious DLL. The DLL is loaded because the application's directory is searched early. According to CrowdStrike, this method is the most common. [7] DLL sideloading delivers both the legitimate program and malicious library. It may ...
Also, the executable must be linked to each static library that either contains the function code or more commonly defines runtime, dynamic linking to a system dynamic link library (DLL). Generally, for functions in a DLL named like Abc.dll, the program must be linked to a library named like Abc.lib. For MinGW, the library name is like libAbc ...