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09/27/2009 at 06:41AM PDT, ID: 24765090
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8.6

GetProcAddress without LoadLibrary only by knowing handle

Asked by DelphiUK in Delphi Programming, Free Pascal

Tags: GetProcAddress without LoadLibrary

HI

I am trying to inject a DLL into a procces. It works fine by using "CreateRemoteThread" and "LoadLibraryA".
In the code below i am using "GetExitCodeThread" to get the handle off the loaded DLL file.

My question is why isn't it possible to use "GetProcAddress" and run a custom procedure in the dll file. Because I am getting the dll file handle from "GetExitCodeThread" I should be able to use "GetProcAddress" to get the address of my custom function, and then run it??

But when I use the code below the returning address of "GetProcAddress" is NIL?? 
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function InjectDll(PID: DWORD; sDll: string): Boolean;
type
  TRestore = procedure; stdcall;
var
  hLib: Pointer;
  hThread: THandle;
 
  hOpen: THandle;
  dWritten: Cardinal;
  ThreadID: Cardinal;
 
  hDll: Dword;
  lpMyFunc: pdWord;
  dwOffset: Dword;
  lpRemoteProc: Dword;
  lpDllBase: Dword;
  d: TRestore;
  f:Pointer;
begin
  Result := FALSE;
  GetDebugPrivs;
 
  hOpen := OpenProcess(PROCESS_ALL_ACCESS, FALSE, PID);
 
  if hOpen <> INVALID_HANDLE_VALUE then
  begin
 
    hLib := GetProcAddress(GetModuleHandle(PChar('kernel32.dll')), PChar('LoadLibraryA'));
 
    pMod := VirtualAllocEx(hOpen, nil, Length(sDll) + 1, MEM_COMMIT or MEM_RESERVE, PAGE_EXECUTE_READWRITE) //PAGE_EXECUTE_READWRITEE
 
 
    if WriteProcessMemory(hOpen, pMod, @sDll[1], Length(sDll), dWritten) then
      Result := TRUE;
   
    hThread := CreateRemoteThread(hOpen, nil, 0, hLib, pMod, 0, ThreadID);
 
 
    WaitForSingleObject(hThread, 5000); //wait for the thread to execute
   // Wait for thread completion and get DLL base
    GetExitCodeThread(hThread, hLibModule);
 
 
    lpDllBase := hLibModule;
 
    CloseHandle(hThread);
   @d := GetProcAddress(lpDllBase, 'Restore');
    d;
 
    VirtualFreeEx(hOpen, pMod, 0, MEM_RELEASE);
  end;
 
  CloseHandle(hOpen);
end;
 
Keywords: GetProcAddress without LoadLibrary …
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About this solution

Zones: Delphi Programming, Free Pascal
Tags: GetProcAddress without LoadLibrary
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Solution Provided By: ThievingSix
Participating Experts: 2
Solution Grade: A
 
 
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