How a Simple LoadLibraryA Injector Works

eight-x_cheats · March 4, 2026, 1:03pm

LoadLibraryA DLL Injection — Internal Explained

Windows Usermode Injection • C++ Example • Loader Internals

Beginner Friendly Stable Method Detectable

Table of Contents

• Introduction
• Injection Theory
• Execution Flow
• Windows API Used
• C++ Example
• What Happens Internally
• Common Mistakes

1. Introduction

LoadLibraryA injection is the most classic and documented DLL injection technique on Windows.

Instead of manually mapping a DLL, we force the target process to execute:

LoadLibraryA("C:\\yourdll.dll");

The Windows loader handles everything else.

2. Injection Theory

The injector performs 4 main actions:

Open target process
Allocate memory inside it
Write DLL path
Create remote thread calling LoadLibraryA

That’s it.

3. Execution Flow

Injector
 ├── OpenProcess
 ├── VirtualAllocEx
 ├── WriteProcessMemory
 └── CreateRemoteThread
            ↓
Target Process
 └── LoadLibraryA
        ├── Map sections
        ├── Resolve imports
        ├── Apply relocations
        └── Execute DllMain

4. Windows API Used

• OpenProcess
• VirtualAllocEx
• WriteProcessMemory
• GetModuleHandleA
• GetProcAddress
• CreateRemoteThread
• WaitForSingleObject

5. Minimal C++ Injector

#include <windows.h>
#include <iostream>

int main()
{
    DWORD pid = 1234;
    const char* dllPath = "C:\\mydll.dll";

    HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
    if (!hProcess) return 1;

    LPVOID remoteBuffer = VirtualAllocEx(
        hProcess,
        NULL,
        strlen(dllPath) + 1,
        MEM_COMMIT | MEM_RESERVE,
        PAGE_READWRITE
    );

    WriteProcessMemory(
        hProcess,
        remoteBuffer,
        dllPath,
        strlen(dllPath) + 1,
        NULL
    );

    LPVOID loadLib = GetProcAddress(
        GetModuleHandleA("kernel32.dll"),
        "LoadLibraryA"
    );

    HANDLE hThread = CreateRemoteThread(
        hProcess,
        NULL,
        0,
        (LPTHREAD_START_ROUTINE)loadLib,
        remoteBuffer,
        0,
        NULL
    );

    WaitForSingleObject(hThread, INFINITE);

    CloseHandle(hThread);
    CloseHandle(hProcess);
}

6. What Happens Internally

When LoadLibraryA runs inside the target process:

• LdrLoadDll is called
• PE headers parsed
• Sections mapped into memory
• IAT resolved
• Relocations applied
• TLS callbacks executed
• DllMain triggered

This is why this method is stable.

7. Common Mistakes

Access Denied
→ Run injector as Administrator

Architecture mismatch
→ x64 → x64
→ x86 → x86

Crash after injection
→ Heavy logic inside DllMain
→ Missing dependencies

Simple • Educational • Not Stealth