public IntPtr Call()
{
// Write the DLL path into the remote process
var dllPathBuffer = _injectionWrapper.MemoryManager.AllocateVirtualMemory(_injectionWrapper.DllPath.Length);
var dllPathBytes = Encoding.Unicode.GetBytes(_injectionWrapper.DllPath);
_injectionWrapper.MemoryManager.WriteVirtualMemory(dllPathBuffer, dllPathBytes);
// Write a UnicodeString representing the DLL path into the remote process
var unicodeStringBuffer = _injectionTools.CreateRemoteUnicodeString(dllPathBuffer);
// Call LdrLoadDll in the remote process
var moduleHandleBuffer = _injectionWrapper.MemoryManager.AllocateVirtualMemory <IntPtr>();
_injectionTools.CallRemoteFunction("ntdll.dll", "LdrLoadDll", 0, 0, (ulong)unicodeStringBuffer, (ulong)moduleHandleBuffer);
// Free the buffers allocated in the remote process
_injectionWrapper.MemoryManager.FreeVirtualMemory(dllPathBuffer);
_injectionWrapper.MemoryManager.FreeVirtualMemory(unicodeStringBuffer);
try
{
return(_injectionWrapper.MemoryManager.ReadVirtualMemory <IntPtr>(moduleHandleBuffer));
}
finally
{
_injectionWrapper.MemoryManager.FreeVirtualMemory(moduleHandleBuffer);
}
}
public IntPtr Call()
{
// Write the DLL path into the remote process
var dllPathBuffer = _injectionWrapper.MemoryManager.AllocateVirtualMemory(_injectionWrapper.DllPath.Length);
var dllPathBytes = Encoding.Unicode.GetBytes(_injectionWrapper.DllPath);
_injectionWrapper.MemoryManager.WriteVirtualMemory(dllPathBuffer, dllPathBytes);
// Write a UnicodeString representing the DLL path into the remote process
var unicodeStringBuffer = _injectionTools.CreateRemoteUnicodeString(dllPathBuffer);
// Get the address of the LdrLoadDll function in the remote process
var ldrLoadDllAddress = _injectionWrapper.RemoteProcess.GetFunctionAddress("ntdll.dll", "LdrLoadDll");
// Write the shellcode used to call LdrLoadDll from a thread into the remote process
var moduleHandleBuffer = _injectionWrapper.MemoryManager.AllocateVirtualMemory <IntPtr>();
var shellcode = _injectionWrapper.Assembler.AssembleThreadHijackFunctionCall(ldrLoadDllAddress, 0, 0, (ulong)unicodeStringBuffer, (ulong)moduleHandleBuffer);
var shellcodeBuffer = _injectionWrapper.MemoryManager.AllocateVirtualMemory(shellcode.Length);
_injectionWrapper.MemoryManager.WriteVirtualMemory(shellcodeBuffer, shellcode);
// Open a handle to the first thread in the remote process
var firstThreadHandle = PInvoke.OpenThread(Enumerations.ThreadAccessMask.AllAccess, false, _injectionWrapper.RemoteProcess.Process.Threads[0].Id);
if (_injectionWrapper.RemoteProcess.IsWow64)
{
// Suspend the thread
if (PInvoke.Wow64SuspendThread(firstThreadHandle) == -1)
{
ExceptionHandler.ThrowWin32Exception("Failed to suspend a thread in the remote process");
}
// Get the context of the thread
var threadContextBuffer = Marshal.AllocHGlobal(Marshal.SizeOf <Structures.Wow64Context>());
Marshal.StructureToPtr(new Structures.Wow64Context {
ContextFlags = Enumerations.ContextFlags.Control
}, threadContextBuffer, false);
if (!PInvoke.Wow64GetThreadContext(firstThreadHandle, threadContextBuffer))
{
ExceptionHandler.ThrowWin32Exception("Failed to get the context of a thread in the remote process");
}
var threadContext = Marshal.PtrToStructure <Structures.Wow64Context>(threadContextBuffer);
// Write the original instruction pointer of the thread into its stack
threadContext.Esp -= sizeof(uint);
_injectionWrapper.MemoryManager.WriteVirtualMemory((IntPtr)threadContext.Esp, threadContext.Eip);
// Overwrite the instruction pointer of the thread with the address of the shellcode buffer
threadContext.Eip = (uint)shellcodeBuffer;
Marshal.StructureToPtr(threadContext, threadContextBuffer, true);
// Update the context of the thread
if (!PInvoke.Wow64SetThreadContext(firstThreadHandle, threadContextBuffer))
{
ExceptionHandler.ThrowWin32Exception("Failed to set the context of a thread in the remote process");
}
Marshal.FreeHGlobal(threadContextBuffer);
}
else
{
// Suspend the thread
if (PInvoke.SuspendThread(firstThreadHandle) == -1)
{
ExceptionHandler.ThrowWin32Exception("Failed to suspend a thread in the remote process");
}
// Get the context of the thread
var threadContextBuffer = Marshal.AllocHGlobal(Marshal.SizeOf <Structures.Context>());
Marshal.StructureToPtr(new Structures.Context {
ContextFlags = Enumerations.ContextFlags.Control
}, threadContextBuffer, false);
if (!PInvoke.GetThreadContext(firstThreadHandle, threadContextBuffer))
{
ExceptionHandler.ThrowWin32Exception("Failed to get the context of a thread in the remote process");
}
var threadContext = Marshal.PtrToStructure <Structures.Context>(threadContextBuffer);
// Write the original instruction pointer of the thread into its stack
threadContext.Rsp -= sizeof(ulong);
_injectionWrapper.MemoryManager.WriteVirtualMemory((IntPtr)threadContext.Rsp, threadContext.Rip);
// Overwrite the instruction pointer of the thread with the address of the shellcode buffer
threadContext.Rip = (ulong)shellcodeBuffer;
Marshal.StructureToPtr(threadContext, threadContextBuffer, true);
// Update the context of the thread
if (!PInvoke.SetThreadContext(firstThreadHandle, threadContextBuffer))
{
ExceptionHandler.ThrowWin32Exception("Failed to set the context of a thread in the remote process");
}
Marshal.FreeHGlobal(threadContextBuffer);
}
// Resume the thread
if (PInvoke.ResumeThread(firstThreadHandle) == -1)
{
ExceptionHandler.ThrowWin32Exception("Failed to resume a thread in the remote process");
}
firstThreadHandle.Dispose();
PInvoke.SwitchToThisWindow(_injectionWrapper.RemoteProcess.Process.MainWindowHandle, true);
while (!_injectionWrapper.RemoteProcess.Modules.Any(module => module.FilePath.Equals(_injectionWrapper.DllPath, StringComparison.OrdinalIgnoreCase)))
{
_injectionWrapper.RemoteProcess.Refresh();
}
// Free the buffers allocated in the remote process
_injectionWrapper.MemoryManager.FreeVirtualMemory(dllPathBuffer);
_injectionWrapper.MemoryManager.FreeVirtualMemory(unicodeStringBuffer);
try
{
return(_injectionWrapper.MemoryManager.ReadVirtualMemory <IntPtr>(moduleHandleBuffer));
}
finally
{
_injectionWrapper.MemoryManager.FreeVirtualMemory(moduleHandleBuffer);
}
}