private static void PatchImports(JLibrary.PortableExecutable.PortableExecutable image, IntPtr hProcess, int processId)
        {
            string lpBuffer = string.Empty;
            string str2     = string.Empty;

            foreach (IMAGE_IMPORT_DESCRIPTOR image_import_descriptor in image.EnumImports())
            {
                if (image.ReadString((long)image.GetPtrFromRVA(image_import_descriptor.Name), SeekOrigin.Begin, out lpBuffer, -1, null))
                {
                    IMAGE_THUNK_DATA image_thunk_data;
                    IntPtr           zero = IntPtr.Zero;
                    zero = GetRemoteModuleHandle(lpBuffer, processId);
                    if (zero.IsNull())
                    {
                        throw new FileNotFoundException(string.Format("Unable to load dependent module '{0}'.", lpBuffer));
                    }
                    uint ptrFromRVA = image.GetPtrFromRVA(image_import_descriptor.FirstThunkPtr);
                    uint num2       = (uint)Marshal.SizeOf(typeof(IMAGE_THUNK_DATA));
                    while (image.Read <IMAGE_THUNK_DATA>((long)ptrFromRVA, SeekOrigin.Begin, out image_thunk_data) && (image_thunk_data.u1.AddressOfData > 0))
                    {
                        IntPtr hModule    = IntPtr.Zero;
                        object lpProcName = null;
                        if ((image_thunk_data.u1.Ordinal & 0x80000000) == 0)
                        {
                            if (!image.ReadString((long)(image.GetPtrFromRVA(image_thunk_data.u1.AddressOfData) + 2), SeekOrigin.Begin, out str2, -1, null))
                            {
                                throw image.GetLastError();
                            }
                            lpProcName = str2;
                        }
                        else
                        {
                            lpProcName = (ushort)(image_thunk_data.u1.Ordinal & 0xffff);
                        }
                        if (!(hModule = WinAPI.GetModuleHandleA(lpBuffer)).IsNull())
                        {
                            IntPtr ptr = lpProcName.GetType().Equals(typeof(string)) ? WinAPI.GetProcAddress(hModule, (string)lpProcName) : WinAPI.GetProcAddress(hModule, (uint)(((ushort)lpProcName) & 0xffff));
                            if (!ptr.IsNull())
                            {
                                hModule = zero.Add((long)ptr.Subtract(((long)hModule.ToInt32())).ToInt32());
                            }
                        }
                        else
                        {
                            hModule = WinAPI.GetProcAddressEx(hProcess, zero, lpProcName);
                        }
                        if (hModule.IsNull())
                        {
                            throw new EntryPointNotFoundException(string.Format("Unable to locate imported function '{0}' from module '{1}' in the remote process.", str2, lpBuffer));
                        }
                        image.Write <int>((long)ptrFromRVA, SeekOrigin.Begin, hModule.ToInt32());
                        ptrFromRVA += num2;
                    }
                }
            }
        }
Пример #2
0
        /*
         * Handles loading of all dependent modules. Iterates the IAT entries and attempts to load (using LoadLibrary) all 
         * of the necessary modules for the main module to function. The manifest is extracted and activation contexts used to
         * ensure correct loading of Side-By-Side dependencies.
         */
        private static bool LoadDependencies(PortableExecutable image, IntPtr hProcess, int processId)
        {
            List<string> neededDependencies = new List<string>();
            string curdep = string.Empty;
            bool success = false;

            foreach (var desc in image.EnumImports())
            {
                if (image.ReadString(image.GetPtrFromRVA(desc.Name), SeekOrigin.Begin, out curdep) && !string.IsNullOrEmpty(curdep))
                {
                    if (GetRemoteModuleHandle(curdep, processId).IsNull())
                        neededDependencies.Add(curdep);
                }
            }

            if (neededDependencies.Count > 0) //do we actually need to load any new modules?
            {
                byte[] bManifest = ExtractManifest(image);
                string pathManifest = string.Empty;

                if (bManifest == null) // no internal manifest, may be an external manifest or none at all?
                {
                    if (!string.IsNullOrEmpty(image.FileLocation) && File.Exists(Path.Combine(Path.GetDirectoryName(image.FileLocation), Path.GetFileName(image.FileLocation) + ".manifest")))
                    {
                        pathManifest = Path.Combine(Path.GetDirectoryName(image.FileLocation), Path.GetFileName(image.FileLocation) + ".manifest");
                    }
                    else // no internal or external manifest, presume no side-by-side dependencies.
                    {
                        var standard = InjectionMethod.Create(InjectionMethodType.Standard);
                        var results = standard.InjectAll(neededDependencies.ToArray(), hProcess);

                        foreach (var result in results)
                            if (result.IsNull())
                                return false; // failed to inject a dependecy, abort mission.

                        return true; // done loading dependencies.
                    }
                }
                else
                {
                    pathManifest = Utils.WriteTempData(bManifest);
                }

                if (string.IsNullOrEmpty(pathManifest))
                    return false;

                IntPtr pResolverStub = WinAPI.VirtualAllocEx(hProcess, IntPtr.Zero, (uint)RESOLVER_STUB.Length, 0x1000 | 0x2000, 0x40);
                IntPtr pManifest = WinAPI.CreateRemotePointer(hProcess, Encoding.ASCII.GetBytes(pathManifest + "\0"), 0x04);
                IntPtr pModules = WinAPI.CreateRemotePointer(hProcess, Encoding.ASCII.GetBytes(string.Join("\0", neededDependencies.ToArray()) + "\0"), 0x04);

                if (!pResolverStub.IsNull())
                {
                    var resolverStub = (byte[])RESOLVER_STUB.Clone();
                    uint nBytes = 0;

                    // Call patching. Patch the empty function addresses with the runtime addresses.
                    BitConverter.GetBytes(FN_CREATEACTCTXA.Subtract(pResolverStub.Add(0x3F)).ToInt32()).CopyTo(resolverStub, 0x3B);
                    BitConverter.GetBytes(FN_ACTIVATEACTCTX.Subtract(pResolverStub.Add(0x58)).ToInt32()).CopyTo(resolverStub, 0x54);
                    BitConverter.GetBytes(FN_GETMODULEHANDLEA.Subtract(pResolverStub.Add(0x84)).ToInt32()).CopyTo(resolverStub, 0x80);
                    BitConverter.GetBytes(FN_LOADLIBRARYA.Subtract(pResolverStub.Add(0x92)).ToInt32()).CopyTo(resolverStub, 0x8E);
                    BitConverter.GetBytes(FN_DEACTIVATEACTCTX.Subtract(pResolverStub.Add(0xC8)).ToInt32()).CopyTo(resolverStub, 0xC4);
                    BitConverter.GetBytes(FN_RELEASEACTCTX.Subtract(pResolverStub.Add(0xD1)).ToInt32()).CopyTo(resolverStub, 0xCD);

                    // Parameter patching
                    BitConverter.GetBytes(pManifest.ToInt32()).CopyTo(resolverStub, 0x1F);
                    BitConverter.GetBytes(neededDependencies.Count).CopyTo(resolverStub, 0x28);
                    BitConverter.GetBytes(pModules.ToInt32()).CopyTo(resolverStub, 0x31);

                    if (WinAPI.WriteProcessMemory(hProcess, pResolverStub, resolverStub, resolverStub.Length, out nBytes) && nBytes == (uint)resolverStub.Length)
                    {
                        uint result = WinAPI.RunThread(hProcess, pResolverStub, 0, 5000);
                        success = (result != uint.MaxValue && result != 0);
                    }

                    // Cleanup
                    WinAPI.VirtualFreeEx(hProcess, pModules, 0, 0x8000);
                    WinAPI.VirtualFreeEx(hProcess, pManifest, 0, 0x8000);
                    WinAPI.VirtualFreeEx(hProcess, pResolverStub, 0, 0x8000);
                }
            }

            return success;
        }
        private static bool LoadDependencies(JLibrary.PortableExecutable.PortableExecutable image, IntPtr hProcess, int processId)
        {
            List <string> list     = new List <string>();
            string        lpBuffer = string.Empty;
            bool          flag     = false;

            foreach (IMAGE_IMPORT_DESCRIPTOR image_import_descriptor in image.EnumImports())
            {
                if ((image.ReadString((long)image.GetPtrFromRVA(image_import_descriptor.Name), SeekOrigin.Begin, out lpBuffer, -1, null) && !string.IsNullOrEmpty(lpBuffer)) && GetRemoteModuleHandle(lpBuffer, processId).IsNull())
                {
                    list.Add(lpBuffer);
                }
            }
            if (list.Count > 0)
            {
                byte[] data = ExtractManifest(image);
                string str2 = string.Empty;
                if (data == null)
                {
                    if (string.IsNullOrEmpty(image.FileLocation) || !File.Exists(Path.Combine(Path.GetDirectoryName(image.FileLocation), Path.GetFileName(image.FileLocation) + ".manifest")))
                    {
                        IntPtr[] ptrArray = InjectionMethod.Create(InjectionMethodType.Standard).InjectAll(list.ToArray(), hProcess);
                        foreach (IntPtr ptr in ptrArray)
                        {
                            if (ptr.IsNull())
                            {
                                return(false);
                            }
                        }
                        return(true);
                    }
                    str2 = Path.Combine(Path.GetDirectoryName(image.FileLocation), Path.GetFileName(image.FileLocation) + ".manifest");
                }
                else
                {
                    str2 = Utils.WriteTempData(data);
                }
                if (string.IsNullOrEmpty(str2))
                {
                    return(false);
                }
                IntPtr ptr2      = WinAPI.VirtualAllocEx(hProcess, IntPtr.Zero, (uint)RESOLVER_STUB.Length, 0x3000, 0x40);
                IntPtr lpAddress = WinAPI.CreateRemotePointer(hProcess, Encoding.ASCII.GetBytes(str2 + "\0"), 4);
                IntPtr ptr4      = WinAPI.CreateRemotePointer(hProcess, Encoding.ASCII.GetBytes(string.Join("\0", list.ToArray()) + "\0"), 4);
                if (!ptr2.IsNull())
                {
                    byte[] array = (byte[])RESOLVER_STUB.Clone();
                    uint   lpNumberOfBytesRead = 0;
                    BitConverter.GetBytes(FN_CREATEACTCTXA.Subtract(ptr2.Add(((long)0x3fL))).ToInt32()).CopyTo(array, 0x3b);
                    BitConverter.GetBytes(FN_ACTIVATEACTCTX.Subtract(ptr2.Add(((long)0x58L))).ToInt32()).CopyTo(array, 0x54);
                    BitConverter.GetBytes(FN_GETMODULEHANDLEA.Subtract(ptr2.Add(((long)0x84L))).ToInt32()).CopyTo(array, 0x80);
                    BitConverter.GetBytes(FN_LOADLIBRARYA.Subtract(ptr2.Add(((long)0x92L))).ToInt32()).CopyTo(array, 0x8e);
                    BitConverter.GetBytes(FN_DEACTIVATEACTCTX.Subtract(ptr2.Add(((long)200L))).ToInt32()).CopyTo(array, 0xc4);
                    BitConverter.GetBytes(FN_RELEASEACTCTX.Subtract(ptr2.Add(((long)0xd1L))).ToInt32()).CopyTo(array, 0xcd);
                    BitConverter.GetBytes(lpAddress.ToInt32()).CopyTo(array, 0x1f);
                    BitConverter.GetBytes(list.Count).CopyTo(array, 40);
                    BitConverter.GetBytes(ptr4.ToInt32()).CopyTo(array, 0x31);
                    if (WinAPI.WriteProcessMemory(hProcess, ptr2, array, array.Length, out lpNumberOfBytesRead) && (lpNumberOfBytesRead == array.Length))
                    {
                        uint num2 = WinAPI.RunThread(hProcess, ptr2, 0, 0x1388);
                        flag = (num2 != uint.MaxValue) && (num2 != 0);
                    }
                    WinAPI.VirtualFreeEx(hProcess, ptr4, 0, 0x8000);
                    WinAPI.VirtualFreeEx(hProcess, lpAddress, 0, 0x8000);
                    WinAPI.VirtualFreeEx(hProcess, ptr2, 0, 0x8000);
                }
            }
            return(flag);
        }
Пример #4
0
        private static void PatchImports(PortableExecutable image, IntPtr hProcess, int processId)
        {
            string module = string.Empty;
            string fname = string.Empty;

            foreach (var desc in image.EnumImports())
            {
                if (image.ReadString(image.GetPtrFromRVA(desc.Name), SeekOrigin.Begin, out module))
                {
                    IntPtr pModule = IntPtr.Zero;
                    IntPtr tModule = IntPtr.Zero;
                    //Thanks to FastLoadDependencies, all dependent modules *should* be loaded into the remote process already.
                    pModule = GetRemoteModuleHandle(module, processId);

                    if (pModule.IsNull())
                        throw new FileNotFoundException(string.Format("Unable to load dependent module '{0}'.", module));

                    //now have a supposedly valid module handle remote process, all that remains to be done is patch the info.
                    uint pThunk = image.GetPtrFromRVA(desc.FirstThunkPtr); //despite the fact FirstThunk and OriginalFirstThunk are identical within an unmapped PE, only FirstThunk is looked up after mapping.
                    uint szThunk = (uint)Marshal.SizeOf(typeof(IMAGE_THUNK_DATA));
                    IMAGE_THUNK_DATA thunk;

                    while (image.Read(pThunk, SeekOrigin.Begin, out thunk) && thunk.u1.AddressOfData > 0) //final thunk is signified by a null-filled IMAGE_THUNK_DATA structure.
                    {
                        IntPtr remote = IntPtr.Zero;
                        object procVal = null;
                        if ((thunk.u1.Ordinal & 0x80000000) == 0) //import by name
                        {
                            if (image.ReadString(image.GetPtrFromRVA(thunk.u1.AddressOfData) + 2, SeekOrigin.Begin, out fname)) //get the function name.
                                procVal = fname;
                            else
                                throw image.GetLastError(); //error occurred during memory iteration, this is only a safeguard and shouldn't really ever occur, but the universe loves proving me wrong.
                        }
                        else //import by ordinal.
                        {
                            procVal = (ushort)(thunk.u1.Ordinal & 0xFFFF);
                        }

                        // the following section of code simply aims to reduce overhead. A check is first performed to see if the current module
                        // is loaded in the current process first, if so it simply uses relative addresses to calculate the function address in the remote
                        // process. If the module isn't found in our process, a call to GetProcAddressEx is used to find the remote address. Of course, you
                        // could simply guarantee the first case by calling LoadLibrary internally, but I find that can have unwanted side effects.
                        if (!(remote = WinAPI.GetModuleHandleA(module)).IsNull())
                        {
                            IntPtr local = procVal.GetType().Equals(typeof(string)) 
                                            ? WinAPI.GetProcAddress(remote, (string)procVal) 
                                            : WinAPI.GetProcAddress(remote, (uint)((ushort)procVal) & 0x0000FFFF);
                            if (!local.IsNull())
                                remote = pModule.Add(local.Subtract(remote.ToInt32()).ToInt32());
                        }
                        else
                        {
                            remote = WinAPI.GetProcAddressEx(hProcess, pModule, procVal);
                        }
                        
                        if (remote.IsNull()) //alas, couldn't find the function.
                            throw new EntryPointNotFoundException(string.Format("Unable to locate imported function '{0}' from module '{1}' in the remote process.", fname, module));

                        image.Write<int>(pThunk, SeekOrigin.Begin, remote.ToInt32()); //overwrite the thunk and continue on our merry way.
                        pThunk += szThunk;
                    }
                }
            }
        }