kernel exploit in csharp

Kernel exploitation in C# can be achieved using P/Invoke calls to interact with the Windows API. One common method for kernel exploitation is to use a technique called direct system calls, which involves the direct invocation of system calls from user-mode code.

To accomplish this in C#, you can define a delegate and use its address to call into the kernel, using a technique called "delegate marshaling". Here is an example of how to call the ZwQuerySystemInformation function from the kernel:


main.cs
using System;
using System.Runtime.InteropServices;

public static class Kernel
{
    private const int SystemModuleInformation = 11;

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    private struct SYSTEM_MODULE_INFORMATION
    {
        public IntPtr Reserved1;
        public IntPtr Reserved2;
        public IntPtr ImageBaseAddress;
        public uint ImageSize;
        public uint Flags;
        public ushort Id;
        public ushort Rank;
        public ushort NameOffset;
        public byte NameSize;
        public byte Reserved3;
        public IntPtr Reserved4;
    }

    private delegate int ZwQuerySystemInformationDelegate(int InfoClass, IntPtr Info, int Size, out int ReturnLength);

    public static void ListModules()
    {
        // Load the NTDLL.dll library and get the function address of ZwQuerySystemInformation
        IntPtr hModule = LoadLibrary("ntdll.dll");
        IntPtr pFunction = GetProcAddress(hModule, "ZwQuerySystemInformation");

        // Create a delegate for the function
        ZwQuerySystemInformationDelegate ZwQuerySystemInformation = (ZwQuerySystemInformationDelegate)Marshal.GetDelegateForFunctionPointer(pFunction, typeof(ZwQuerySystemInformationDelegate));

        // Call the function and output the results
        IntPtr pBuffer = Marshal.AllocHGlobal(256);
        int length;
        int result = ZwQuerySystemInformation(SystemModuleInformation, pBuffer, 256, out length);

        if (result == 0)
        {
            int offset = 0;

            while (true)
            {
                SYSTEM_MODULE_INFORMATION moduleInfo = (SYSTEM_MODULE_INFORMATION)Marshal.PtrToStructure(pBuffer + offset, typeof(SYSTEM_MODULE_INFORMATION));

                if ((moduleInfo.Flags & 0x00000001) != 0)
                {
                    // Output the name and base address of the module
                    byte[] nameBytes = new byte[moduleInfo.NameSize];
                    Marshal.Copy(pBuffer + moduleInfo.NameOffset, nameBytes, 0, moduleInfo.NameSize);
                    string name = Encoding.Unicode.GetString(nameBytes);

                    Console.WriteLine("{0} at 0x{1:X16}", name, moduleInfo.ImageBaseAddress.ToInt64());
                }

                offset += Marshal.SizeOf(moduleInfo);

                if (offset >= length)
                {
                    break;
                }
            }
        }

        // Free the memory allocated for the buffer and unload the library
        Marshal.FreeHGlobal(pBuffer);
        FreeLibrary(hModule);
    }

    [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern IntPtr LoadLibrary(string lpFileName);

    [DllImport("kernel32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
    private static extern IntPtr GetProcAddress(IntPtr hModule, string lpProcName);

    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool FreeLibrary(IntPtr hModule);
}
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This code defines a delegate for the ZwQuerySystemInformation function, loads the NTDLL.dll library, gets the function address, creates the delegate, calls the function, and outputs the results. Note that this code is for educational purposes only and should not be used for malicious activities.

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