CCob-SylantStrike/SylantStrikeInject/BasicInject.cs

//Based on code from https://codingvision.net/security/c-inject-a-dll-into-a-process-w-createremotethread

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;

public class BasicInject {
    [DllImport("kernel32.dll")]
    public static extern IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    public static extern IntPtr GetModuleHandle(string lpModuleName);

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

    [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
    static extern IntPtr VirtualAllocEx(IntPtr hProcess, IntPtr lpAddress,
        uint dwSize, uint flAllocationType, uint flProtect);

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, byte[] lpBuffer, uint nSize, out UIntPtr lpNumberOfBytesWritten);

    [DllImport("kernel32.dll")]
    static extern IntPtr CreateRemoteThread(IntPtr hProcess,
        IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId);

    // privileges
    const int PROCESS_CREATE_THREAD = 0x0002;
    const int PROCESS_QUERY_INFORMATION = 0x0400;
    const int PROCESS_VM_OPERATION = 0x0008;
    const int PROCESS_VM_WRITE = 0x0020;
    const int PROCESS_VM_READ = 0x0010;

    // used for memory allocation
    const uint MEM_COMMIT = 0x00001000;
    const uint MEM_RESERVE = 0x00002000;
    const uint PAGE_READWRITE = 4;

    public static int Inject(int pid, string dllName) {

        // geting the handle of the process - with required privileges
        IntPtr procHandle = OpenProcess(PROCESS_CREATE_THREAD | PROCESS_QUERY_INFORMATION | PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ, false, pid);

        // searching for the address of LoadLibraryA and storing it in a pointer
        IntPtr loadLibraryAddr = GetProcAddress(GetModuleHandle("kernel32.dll"), "LoadLibraryA");

        // alocating some memory on the target process - enough to store the name of the dll
        // and storing its address in a pointer
        IntPtr allocMemAddress = VirtualAllocEx(procHandle, IntPtr.Zero, (uint)((dllName.Length + 1) * Marshal.SizeOf(typeof(char))), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);

        // writing the name of the dll there
        UIntPtr bytesWritten;
        WriteProcessMemory(procHandle, allocMemAddress, Encoding.ASCII.GetBytes(dllName), (uint)((dllName.Length + 1) * Marshal.SizeOf(typeof(char))), out bytesWritten);

        // creating a thread that will call LoadLibraryA with allocMemAddress as argument
        CreateRemoteThread(procHandle, IntPtr.Zero, 0, loadLibraryAddr, allocMemAddress, 0, IntPtr.Zero);

        return 0;
    }
}