public static void RelocateModule(PE.PE_META_DATA PEINFO, IntPtr ModuleMemoryBase) { PE.IMAGE_DATA_DIRECTORY idd = PEINFO.Is32Bit ? PEINFO.OptHeader32.BaseRelocationTable : PEINFO.OptHeader64.BaseRelocationTable; long ImageDelta = PEINFO.Is32Bit ? (long)((ulong)ModuleMemoryBase - PEINFO.OptHeader32.ImageBase) : (long)((ulong)ModuleMemoryBase - PEINFO.OptHeader64.ImageBase); IntPtr pRelocTable = (IntPtr)((ulong)ModuleMemoryBase + idd.VirtualAddress); int nextRelocTableBlock = -1; while (nextRelocTableBlock != 0) { PE.IMAGE_BASE_RELOCATION ibr = new PE.IMAGE_BASE_RELOCATION(); ibr = (PE.IMAGE_BASE_RELOCATION)Marshal.PtrToStructure(pRelocTable, typeof(PE.IMAGE_BASE_RELOCATION)); long RelocCount = ((ibr.SizeOfBlock - Marshal.SizeOf(ibr)) / 2); for (int i = 0; i < RelocCount; i++) { IntPtr pRelocEntry = (IntPtr)((ulong)pRelocTable + (ulong)Marshal.SizeOf(ibr) + (ulong)(i * 2)); ushort RelocValue = (ushort)Marshal.ReadInt16(pRelocEntry); ushort RelocType = (ushort)(RelocValue >> 12); ushort RelocPatch = (ushort)(RelocValue & 0xfff); if (RelocType != 0) { try { IntPtr pPatch = (IntPtr)((ulong)ModuleMemoryBase + ibr.VirtualAdress + RelocPatch); if (RelocType == 0x3) { int OriginalPtr = Marshal.ReadInt32(pPatch); Marshal.WriteInt32(pPatch, (OriginalPtr + (int)ImageDelta)); } else { long OriginalPtr = Marshal.ReadInt64(pPatch); Marshal.WriteInt64(pPatch, (OriginalPtr + ImageDelta)); } } catch { throw new InvalidOperationException("Memory access violation."); } } } pRelocTable = (IntPtr)((ulong)pRelocTable + ibr.SizeOfBlock); nextRelocTableBlock = Marshal.ReadInt32(pRelocTable); } }
public static void RewriteModuleIAT(PE.PE_META_DATA PEINFO, IntPtr ModuleMemoryBase) { PE.IMAGE_DATA_DIRECTORY idd = PEINFO.Is32Bit ? PEINFO.OptHeader32.ImportTable : PEINFO.OptHeader64.ImportTable; IntPtr pImportTable = (IntPtr)((ulong)ModuleMemoryBase + idd.VirtualAddress); Native.OSVERSIONINFOEX OSVersion = new Native.OSVERSIONINFOEX(); Native.RtlGetVersion(ref OSVersion); Dictionary <string, string> ApiSetDict = new Dictionary <string, string>(); if (OSVersion.MajorVersion >= 10) { ApiSetDict = Generic.GetApiSetMapping(); } int counter = 0; Win32.Kernel32.IMAGE_IMPORT_DESCRIPTOR iid = new Win32.Kernel32.IMAGE_IMPORT_DESCRIPTOR(); iid = (Win32.Kernel32.IMAGE_IMPORT_DESCRIPTOR)Marshal.PtrToStructure( (IntPtr)((ulong)pImportTable + (uint)(Marshal.SizeOf(iid) * counter)), typeof(Win32.Kernel32.IMAGE_IMPORT_DESCRIPTOR) ); while (iid.Name != 0) { string DllName = string.Empty; try { DllName = Marshal.PtrToStringAnsi((IntPtr)((ulong)ModuleMemoryBase + iid.Name)); } catch { } if (DllName == string.Empty) { throw new InvalidOperationException("Failed to read DLL name."); } else { if (OSVersion.MajorVersion >= 10 && (DllName.StartsWith("api-") || DllName.StartsWith("ext-")) && ApiSetDict.ContainsKey(DllName) && ApiSetDict[DllName].Length > 0) { DllName = ApiSetDict[DllName]; } IntPtr hModule = Generic.GetLoadedModuleAddress(DllName); if (hModule == IntPtr.Zero) { hModule = Generic.LoadModuleFromDisk(DllName); if (hModule == IntPtr.Zero) { throw new FileNotFoundException(DllName + ", unable to find the specified file."); } } if (PEINFO.Is32Bit) { PE.IMAGE_THUNK_DATA32 oft_itd = new PE.IMAGE_THUNK_DATA32(); for (int i = 0; true; i++) { oft_itd = (PE.IMAGE_THUNK_DATA32)Marshal.PtrToStructure((IntPtr)((ulong)ModuleMemoryBase + iid.OriginalFirstThunk + (uint)(i * (sizeof(uint)))), typeof(PE.IMAGE_THUNK_DATA32)); IntPtr ft_itd = (IntPtr)((ulong)ModuleMemoryBase + iid.FirstThunk + (ulong)(i * (sizeof(uint)))); if (oft_itd.AddressOfData == 0) { break; } if (oft_itd.AddressOfData < 0x80000000) { IntPtr pImpByName = (IntPtr)((ulong)ModuleMemoryBase + oft_itd.AddressOfData + sizeof(ushort)); IntPtr pFunc = IntPtr.Zero; pFunc = Generic.GetNativeExportAddress(hModule, Marshal.PtrToStringAnsi(pImpByName)); Marshal.WriteInt32(ft_itd, pFunc.ToInt32()); } else { ulong fOrdinal = oft_itd.AddressOfData & 0xFFFF; IntPtr pFunc = IntPtr.Zero; pFunc = Generic.GetNativeExportAddress(hModule, (short)fOrdinal); Marshal.WriteInt32(ft_itd, pFunc.ToInt32()); } } } else { PE.IMAGE_THUNK_DATA64 oft_itd = new PE.IMAGE_THUNK_DATA64(); for (int i = 0; true; i++) { oft_itd = (PE.IMAGE_THUNK_DATA64)Marshal.PtrToStructure((IntPtr)((ulong)ModuleMemoryBase + iid.OriginalFirstThunk + (ulong)(i * (sizeof(ulong)))), typeof(PE.IMAGE_THUNK_DATA64)); IntPtr ft_itd = (IntPtr)((ulong)ModuleMemoryBase + iid.FirstThunk + (ulong)(i * (sizeof(ulong)))); if (oft_itd.AddressOfData == 0) { break; } if (oft_itd.AddressOfData < 0x8000000000000000) { IntPtr pImpByName = (IntPtr)((ulong)ModuleMemoryBase + oft_itd.AddressOfData + sizeof(ushort)); IntPtr pFunc = IntPtr.Zero; pFunc = Generic.GetNativeExportAddress(hModule, Marshal.PtrToStringAnsi(pImpByName)); Marshal.WriteInt64(ft_itd, pFunc.ToInt64()); } else { ulong fOrdinal = oft_itd.AddressOfData & 0xFFFF; IntPtr pFunc = IntPtr.Zero; pFunc = Generic.GetNativeExportAddress(hModule, (short)fOrdinal); Marshal.WriteInt64(ft_itd, pFunc.ToInt64()); } } } counter++; iid = (Win32.Kernel32.IMAGE_IMPORT_DESCRIPTOR)Marshal.PtrToStructure( (IntPtr)((ulong)pImportTable + (uint)(Marshal.SizeOf(iid) * counter)), typeof(Win32.Kernel32.IMAGE_IMPORT_DESCRIPTOR) ); } } }