예제 #1
0
        /// <summary>
        /// Injects a dll into a process by hijacking the given thread and redirecting it to LoadLibrary.
        /// </summary>
        /// <param name="hProcess">Handle to process into which dll will be injected.</param>
        /// <param name="hThread">Handle to thread that will be hijacked.</param>
        /// <param name="szDllPath">Full path to the dll to be injected.</param>
        /// <returns>Returns the base address of the injected dll on success, zero on failure.</returns>
        public static uint InjectDllRedirectThread(IntPtr hProcess, IntPtr hThread, string szDllPath)
        {
            const uint INITIAL_EXIT_CODE = 0xFFFFFFFF;

            if (hProcess == IntPtr.Zero)
            {
                throw new ArgumentNullException("hProcess");
            }

            if (hThread == IntPtr.Zero)
            {
                throw new ArgumentNullException("hThread");
            }

            if (szDllPath.Length == 0)
            {
                throw new ArgumentNullException("szDllPath");
            }

            if (!szDllPath.Contains("\\"))
            {
                szDllPath = System.IO.Path.GetFullPath(szDllPath);
            }

            if (!System.IO.File.Exists(szDllPath))
            {
                throw new ArgumentException("DLL not found.", "szDllPath");
            }

            uint          dwBaseAddress = RETURN_ERROR;
            uint          lpLoadLibrary, lpAsmStub;
            CONTEXT       ctx;
            StringBuilder AssemblyStub = new StringBuilder();
            ManagedFasm   fasm         = new ManagedFasm(hProcess);

            lpLoadLibrary = (uint)Imports.GetProcAddress(Imports.GetModuleHandle("kernel32.dll"), "LoadLibraryA");
            if (lpLoadLibrary == 0)
            {
                return(RETURN_ERROR);
            }

            lpAsmStub = SMemory.AllocateMemory(hProcess);
            if (lpAsmStub == 0)
            {
                return(RETURN_ERROR);
            }

            if (SThread.SuspendThread(hThread) != uint.MaxValue)
            {
                ctx = SThread.GetThreadContext(hThread, CONTEXT_FLAGS.CONTEXT_CONTROL);
                if (ctx.Eip > 0)
                {
                    try
                    {
                        //located at lpAsmStub+0, where we can monitor LoadLibrary's exit code.
                        fasm.AddLine("lpExitCode dd 0x{0:X}", INITIAL_EXIT_CODE);

                        //lpAsmStub+4, where the actual code part starts
                        fasm.AddLine("push 0x{0:X}", ctx.Eip);
                        fasm.AddLine("pushad");
                        fasm.AddLine("push szDllPath");
                        fasm.AddLine("call 0x{0:X}", lpLoadLibrary);
                        fasm.AddLine("mov [lpExitCode], eax");
                        fasm.AddLine("popad");
                        fasm.AddLine("retn");

                        //dll path
                        fasm.AddLine("szDllPath db \'{0}\',0", szDllPath);

                        fasm.Inject(lpAsmStub);
                    }
                    catch
                    {
                        SMemory.FreeMemory(hProcess, lpAsmStub);
                        SThread.ResumeThread(hThread);
                        return(RETURN_ERROR);
                    }

                    ctx.ContextFlags = CONTEXT_FLAGS.CONTEXT_CONTROL;
                    ctx.Eip          = lpAsmStub + 4; //skip over lpExitCode data

                    if (SThread.SetThreadContext(hThread, ctx))
                    {
                        if (SThread.ResumeThread(hThread) != uint.MaxValue)
                        {
                            for (int i = 0; i < 400; i++)
                            {
                                System.Threading.Thread.Sleep(5);
                                if ((dwBaseAddress = SMemory.ReadUInt(hProcess, lpAsmStub)) != INITIAL_EXIT_CODE)
                                {
                                    break;
                                }
                            }
                        }
                    }
                }
            }

            if (fasm != null)
            {
                fasm.Dispose();
                fasm = null;
            }

            SMemory.FreeMemory(hProcess, lpAsmStub);

            return(dwBaseAddress);
        }
예제 #2
0
 /// <summary>
 /// Suspends execution of a thread.
 /// </summary>
 /// <param name="hThread">Handle to the thread to be suspended.</param>
 /// <returns>Returns true on success, false on failure.</returns>
 public bool SuspendThread(IntPtr hThread)
 {
     return((SThread.SuspendThread(hThread) == uint.MaxValue) ? false : true);
 }