├── README.md ├── universal-syscall-64 ├── Program.cs ├── universal-syscall-64.csproj └── USysCall64.cs ├── LICENSE ├── universal-syscall-64.sln ├── .gitattributes └── .gitignore /README.md: -------------------------------------------------------------------------------- 1 | # universal-syscall-64 2 | Resolve syscall numbers at runtime for all Windows versions. 3 | -------------------------------------------------------------------------------- /universal-syscall-64/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Diagnostics; 3 | 4 | namespace winternl 5 | { 6 | class Program 7 | { 8 | static void Main(string[] args) 9 | { 10 | if (IntPtr.Size == 4) 11 | { 12 | return; 13 | } 14 | 15 | uint dwOld = 0; 16 | IntPtr allocMem = USysCall64.AllocateMemory((IntPtr)0, 0x1000, 0x00001000, 0x40); 17 | bool bSuccess = USysCall64.ProtectMemory(allocMem, 0x1000, 0x10, ref dwOld); 18 | 19 | Debugger.Break(); 20 | } 21 | } 22 | } -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2024 Jack Ullrich 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /universal-syscall-64.sln: -------------------------------------------------------------------------------- 1 | 2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.30907.101 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "universal-syscall-64", "universal-syscall-64\universal-syscall-64.csproj", "{BC304609-8B9B-4E7C-8B70-A2EFFEAFB4DB}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Release|Any CPU = Release|Any CPU 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {BC304609-8B9B-4E7C-8B70-A2EFFEAFB4DB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {BC304609-8B9B-4E7C-8B70-A2EFFEAFB4DB}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {BC304609-8B9B-4E7C-8B70-A2EFFEAFB4DB}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {BC304609-8B9B-4E7C-8B70-A2EFFEAFB4DB}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | GlobalSection(ExtensibilityGlobals) = postSolution 23 | SolutionGuid = {D641DC66-0D94-408E-995A-91C7985570AB} 24 | EndGlobalSection 25 | EndGlobal 26 | -------------------------------------------------------------------------------- /universal-syscall-64/universal-syscall-64.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Debug 6 | AnyCPU 7 | {BC304609-8B9B-4E7C-8B70-A2EFFEAFB4DB} 8 | Exe 9 | winternl 10 | universal-syscall-64 11 | v4.0 12 | 512 13 | true 14 | 15 | 16 | AnyCPU 17 | true 18 | full 19 | false 20 | bin\Debug\ 21 | DEBUG;TRACE 22 | prompt 23 | 4 24 | true 25 | 26 | 27 | AnyCPU 28 | pdbonly 29 | true 30 | bin\Release\ 31 | TRACE 32 | prompt 33 | 4 34 | true 35 | 36 | 37 | 38 | 39 | 40 | 41 | -------------------------------------------------------------------------------- /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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2 | using System.Collections.Generic; 3 | using System.Diagnostics; 4 | using System.IO.MemoryMappedFiles; 5 | using System.Linq; 6 | using System.Runtime.InteropServices; 7 | 8 | /* 9 | * Author: @winternl 10 | */ 11 | 12 | public unsafe class USysCall64 13 | { 14 | #region PINVOKE 15 | 16 | [DllImport("ntdll")] 17 | private static extern long LdrGetDllHandle(IntPtr pwPath, IntPtr unused, ref UNICODE_STRING pszModule, ref UIntPtr ldrHandle); 18 | 19 | #endregion 20 | 21 | #region STRUCTS 22 | 23 | [StructLayout(LayoutKind.Sequential)] 24 | private struct UNICODE_STRING : IDisposable 25 | { 26 | public ushort Length; 27 | public ushort MaximumLength; 28 | private IntPtr buffer; 29 | 30 | public UNICODE_STRING(string s) 31 | { 32 | Length = (ushort)(s.Length * 2); 33 | MaximumLength = (ushort)(Length + 2); 34 | buffer = Marshal.StringToHGlobalUni(s); 35 | } 36 | 37 | public void Dispose() 38 | { 39 | Marshal.FreeHGlobal(buffer); 40 | buffer = IntPtr.Zero; 41 | } 42 | 43 | public override string ToString() 44 | { 45 | return Marshal.PtrToStringUni(buffer); 46 | } 47 | } 48 | 49 | [StructLayout(LayoutKind.Sequential, Pack = 1)] 50 | private struct IMAGE_DOS_HEADER 51 | { 52 | public UInt16 e_magic; // Magic number 53 | public UInt16 e_cblp; // Bytes on last page of file 54 | public UInt16 e_cp; // Pages in file 55 | public UInt16 e_crlc; // Relocations 56 | public UInt16 e_cparhdr; // Size of header in paragraphs 57 | public UInt16 e_minalloc; // Minimum extra paragraphs needed 58 | public UInt16 e_maxalloc; // Maximum extra paragraphs needed 59 | public UInt16 e_ss; // Initial (relative) SS value 60 | public UInt16 e_sp; // Initial SP value 61 | public UInt16 e_csum; // Checksum 62 | public UInt16 e_ip; // Initial IP value 63 | public UInt16 e_cs; // Initial (relative) CS value 64 | public UInt16 e_lfarlc; // File address of relocation table 65 | public UInt16 e_ovno; // Overlay number 66 | public UInt16 e_res_0; // Reserved words 67 | public UInt16 e_res_1; // Reserved words 68 | public UInt16 e_res_2; // Reserved words 69 | public UInt16 e_res_3; // Reserved words 70 | public UInt16 e_oemid; // OEM identifier (for e_oeminfo) 71 | public UInt16 e_oeminfo; // OEM information; e_oemid specific 72 | public UInt16 e_res2_0; // Reserved words 73 | public UInt16 e_res2_1; // Reserved words 74 | public UInt16 e_res2_2; // Reserved words 75 | public UInt16 e_res2_3; // Reserved words 76 | public UInt16 e_res2_4; // Reserved words 77 | public UInt16 e_res2_5; // Reserved words 78 | public UInt16 e_res2_6; // Reserved words 79 | public UInt16 e_res2_7; // Reserved words 80 | public UInt16 e_res2_8; // Reserved words 81 | public UInt16 e_res2_9; // Reserved words 82 | public UInt32 e_lfanew; // File address of new exe header 83 | } 84 | 85 | [StructLayout(LayoutKind.Sequential, Pack = 1)] 86 | private struct IMAGE_OPTIONAL_HEADER64 87 | { 88 | public UInt16 Magic; 89 | public Byte MajorLinkerVersion; 90 | public Byte MinorLinkerVersion; 91 | public UInt32 SizeOfCode; 92 | public UInt32 SizeOfInitializedData; 93 | public UInt32 SizeOfUninitializedData; 94 | public UInt32 AddressOfEntryPoint; 95 | public UInt32 BaseOfCode; 96 | public UInt64 ImageBase; 97 | public UInt32 SectionAlignment; 98 | public UInt32 FileAlignment; 99 | public UInt16 MajorOperatingSystemVersion; 100 | public UInt16 MinorOperatingSystemVersion; 101 | public UInt16 MajorImageVersion; 102 | public UInt16 MinorImageVersion; 103 | public UInt16 MajorSubsystemVersion; 104 | public UInt16 MinorSubsystemVersion; 105 | public UInt32 Win32VersionValue; 106 | public UInt32 SizeOfImage; 107 | public UInt32 SizeOfHeaders; 108 | public UInt32 CheckSum; 109 | public UInt16 Subsystem; 110 | public UInt16 DllCharacteristics; 111 | public UInt64 SizeOfStackReserve; 112 | public UInt64 SizeOfStackCommit; 113 | public UInt64 SizeOfHeapReserve; 114 | public UInt64 SizeOfHeapCommit; 115 | public UInt32 LoaderFlags; 116 | public UInt32 NumberOfRvaAndSizes; 117 | 118 | public IMAGE_DATA_DIRECTORY ExportTable; 119 | public IMAGE_DATA_DIRECTORY ImportTable; 120 | public IMAGE_DATA_DIRECTORY ResourceTable; 121 | public IMAGE_DATA_DIRECTORY ExceptionTable; 122 | public IMAGE_DATA_DIRECTORY CertificateTable; 123 | public IMAGE_DATA_DIRECTORY BaseRelocationTable; 124 | public IMAGE_DATA_DIRECTORY Debug; 125 | public IMAGE_DATA_DIRECTORY Architecture; 126 | public IMAGE_DATA_DIRECTORY GlobalPtr; 127 | public IMAGE_DATA_DIRECTORY TLSTable; 128 | public IMAGE_DATA_DIRECTORY LoadConfigTable; 129 | public IMAGE_DATA_DIRECTORY BoundImport; 130 | public IMAGE_DATA_DIRECTORY IAT; 131 | public IMAGE_DATA_DIRECTORY DelayImportDescriptor; 132 | public IMAGE_DATA_DIRECTORY CLRRuntimeHeader; 133 | public IMAGE_DATA_DIRECTORY Reserved; 134 | } 135 | 136 | [StructLayout(LayoutKind.Sequential)] 137 | private struct IMAGE_DATA_DIRECTORY 138 | { 139 | public UInt32 VirtualAddress; 140 | public UInt32 Size; 141 | } 142 | 143 | [StructLayout(LayoutKind.Sequential)] 144 | private struct IMAGE_EXPORT_DIRECTORY 145 | { 146 | public UInt32 Characteristics; 147 | public UInt32 TimeDateStamp; 148 | public UInt16 MajorVersion; 149 | public UInt16 MinorVersion; 150 | public UInt32 Name; 151 | public UInt32 Base; 152 | public UInt32 NumberOfFunctions; 153 | public UInt32 NumberOfNames; 154 | public UInt32 AddressOfFunctions; 155 | public UInt32 AddressOfNames; 156 | public UInt32 AddressOfNameOrdinals; 157 | } 158 | 159 | #endregion 160 | 161 | private static readonly Dictionary SysCallTable; 162 | 163 | // TODO: Stack alignment 164 | private static readonly byte[] SysCallStub = 165 | { 166 | 0x4C, 0x8B, 0xD1, // mov r10, rcx 167 | 0xB8, 0x00, 0x00, 0x00, 0x00, // mov eax, sys_no 168 | 0x0F, 0x05, // syscall 169 | 0xC3 // retn 170 | }; 171 | 172 | static unsafe USysCall64() 173 | { 174 | UNICODE_STRING szNtdll = new UNICODE_STRING("ntdll"); 175 | UIntPtr ptrNtdll = UIntPtr.Zero; 176 | 177 | long ntstatus = LdrGetDllHandle(IntPtr.Zero, IntPtr.Zero, ref szNtdll, ref ptrNtdll); 178 | 179 | if (ntstatus != 0) 180 | { 181 | Debugger.Break(); 182 | } 183 | 184 | byte* lpNtdll = (byte*)ptrNtdll; 185 | IMAGE_DOS_HEADER* piDH = (IMAGE_DOS_HEADER*)lpNtdll; 186 | IMAGE_OPTIONAL_HEADER64* piOH = (IMAGE_OPTIONAL_HEADER64*)(lpNtdll + piDH->e_lfanew + 0x18); 187 | IMAGE_EXPORT_DIRECTORY* exportDir = (IMAGE_EXPORT_DIRECTORY*)(lpNtdll + piOH->ExportTable.VirtualAddress); 188 | 189 | uint* names = (uint*)(lpNtdll + exportDir->AddressOfNames); 190 | uint* functions = (uint*)(lpNtdll + exportDir->AddressOfFunctions); 191 | ushort* ordinals = (ushort*)(lpNtdll + exportDir->AddressOfNameOrdinals); 192 | 193 | var listOfNames = new List(); 194 | 195 | var dictOfZwFunctions = new Dictionary(); 196 | 197 | for (int i = 0; i < exportDir->NumberOfNames; i++) 198 | { 199 | var name = Marshal.PtrToStringAnsi(new IntPtr(lpNtdll + names[i])); 200 | 201 | if (!name.StartsWith("Zw")) 202 | { 203 | continue; 204 | } 205 | 206 | var fnAddr = new UIntPtr(lpNtdll + functions[ordinals[i]]); 207 | 208 | dictOfZwFunctions.Add(name, fnAddr.ToUInt64()); 209 | } 210 | 211 | var sortedByAddr = dictOfZwFunctions 212 | .OrderBy(x => x.Value) 213 | .ToDictionary(x => "Nt" + x.Key.Substring(2, x.Key.Length - 2), x => x.Value); 214 | 215 | var sysCallLookup = new Dictionary(); 216 | 217 | uint sysNo = 0; 218 | 219 | foreach (var entry in sortedByAddr) 220 | { 221 | sysCallLookup.Add(entry.Key, sysNo); 222 | sysNo++; 223 | } 224 | 225 | SysCallTable = sysCallLookup; 226 | } 227 | 228 | private static unsafe T AllocRWX(byte[] lpBuffer) where T : class 229 | { 230 | try 231 | { 232 | var mapName = Guid.NewGuid().ToString(); 233 | var mapFile = MemoryMappedFile.CreateNew(mapName, lpBuffer.Length, MemoryMappedFileAccess.ReadWriteExecute); 234 | var mapView = mapFile.CreateViewAccessor(0, lpBuffer.Length, MemoryMappedFileAccess.ReadWriteExecute); 235 | 236 | mapView.WriteArray(0, lpBuffer, 0, lpBuffer.Length); 237 | 238 | byte* ptrShellcode = (byte*)IntPtr.Zero; 239 | mapView.SafeMemoryMappedViewHandle.AcquirePointer(ref ptrShellcode); 240 | 241 | return (T)(object)Marshal.GetDelegateForFunctionPointer((IntPtr)ptrShellcode, typeof(T)); 242 | } 243 | catch 244 | { 245 | return null; 246 | } 247 | } 248 | private static byte[] GetSysCallStub(uint sysNo) 249 | { 250 | byte[] locBuffer = new byte[SysCallStub.Length]; 251 | byte[] no = BitConverter.GetBytes(sysNo); 252 | 253 | SysCallStub.CopyTo(locBuffer, 0); 254 | Buffer.BlockCopy(no, 0, locBuffer, 4, 4); 255 | return locBuffer; 256 | } 257 | 258 | #region NTAPI Delegates 259 | 260 | private delegate long NtAllocateVirtualMemory(IntPtr ProcessHandle, ref IntPtr BaseAddress, IntPtr ZeroBits, ref IntPtr RegionSize, uint AllocationType, uint Protect); 261 | 262 | private delegate long NtProtectVirtualMemory(IntPtr ProcessHandle, ref IntPtr BaseAddress, ref uint NumberOfBytesToProtect, uint NewAccessProtection, ref uint OldAccessProtection); 263 | 264 | #endregion 265 | 266 | public static IntPtr AllocateMemory(IntPtr Address, uint Size, uint AllocType, uint Protect) 267 | { 268 | return AllocateMemoryEx((IntPtr)(-1), Address, Size, AllocType, Protect); 269 | } 270 | 271 | public static IntPtr AllocateMemoryEx(IntPtr ProcessHandle, IntPtr Address, uint Size, uint AllocType, uint Protect) 272 | { 273 | var sc = GetSysCallStub(SysCallTable["NtAllocateVirtualMemory"]); 274 | 275 | var AllocMem = AllocRWX(sc); 276 | 277 | if (AllocMem == null) 278 | { 279 | return IntPtr.Zero; 280 | } 281 | 282 | IntPtr baseAddress = Address; 283 | IntPtr regionSize = (IntPtr)Size; 284 | 285 | long ntStatus = AllocMem(ProcessHandle, ref baseAddress, IntPtr.Zero, ref regionSize, AllocType, Protect); 286 | 287 | if (ntStatus != 0) 288 | { 289 | return IntPtr.Zero; 290 | } 291 | else 292 | { 293 | return baseAddress; 294 | } 295 | } 296 | 297 | public static bool ProtectMemory(IntPtr Address, uint ProtectSize, uint NewProtection, ref uint OldProtection) 298 | { 299 | return ProtectMemoryEx((IntPtr)(-1), Address, ProtectSize, NewProtection, ref OldProtection); 300 | } 301 | 302 | public static bool ProtectMemoryEx(IntPtr ProcessHandle, IntPtr Address, uint ProtectSize, uint NewProtection, ref uint OldProtection) 303 | { 304 | var sc = GetSysCallStub(SysCallTable["NtProtectVirtualMemory"]); 305 | var ProtectMem = AllocRWX(sc); 306 | 307 | if (ProtectMem == null) 308 | { 309 | return false; 310 | } 311 | 312 | IntPtr baseAddress = Address; 313 | uint protSize = ProtectSize; 314 | 315 | long ntStatus = ProtectMem((IntPtr)ProcessHandle, ref baseAddress, ref protSize, NewProtection, ref OldProtection); 316 | 317 | if (ntStatus != 0) 318 | { 319 | return false; 320 | } 321 | else 322 | { 323 | return true; 324 | } 325 | } 326 | } --------------------------------------------------------------------------------