DLL Injector

DLL Injector

A free, open-source tool to inject a DLL into a running process, hook and modify WinAPI calls at runtime, check exported functions and unload DLLs - built for developers, QA, reverse engineers and security researchers doing authorized testing.

Download for WindowsSee what it does

A direct tool for DLL injection and WinAPI hooking

DLL Injector brings the essential process-instrumentation workflow into one desktop interface for Windows: choose a process, load a DLL, configure a hook for a supported WinAPI function, check results and clean up - without forcing every task through custom scripts or scattered low-level utilities.

It assumes technical intent and is made for developers, QA engineers, reverse engineers, security researchers working in isolated labs, students of Windows internals and power users who need a practical tool for legitimate DLL testing on owned or authorized systems.

What it does

Inject a DLL into a running process

Select a running process, choose a DLL file and inject it straight from the desktop interface. Processes are listed by name and PID, so picking the right target is faster and less error-prone than working with raw process IDs.

Process + PID listCustom DLL fileOne target at a time

See running processes in a visual grid

Active processes appear in a clear grid with names and PIDs, plus a per-process menu for the available actions. Reload the list when process state changes - no separate PID lookup tool required.

Names + PIDsReload on demandPer-process actions

Hook supported WinAPI functions

Configure hooks for selected API functions to test how a process behaves when file, registry, memory, process or library-loading calls are intercepted in a controlled environment.

File & registryProcess & memoryLibrary loading

Modify call parameters at runtime

For supported hooks, edit parameters such as paths, buffers, handles and access flags, and choose whether a call is passed through or blocked. Redirect a file path, block a delete, change a buffer or alter registry data while the process runs.

Editable paramsBlock or passRedirect paths

Check whether a function is present

The Utils menu can check a target process for a specific exported function. Confirm a function is available before attempting deeper testing, instead of finding out only after a failed hook.

Exported functionsQuick presence check

Unload DLLs from target processes

List the modules loaded in a selected process and attempt to unload a chosen DLL. Useful during iterative development when a DLL needs to be removed, rebuilt and re-tested without restarting the whole workflow.

Module listingUnload a moduleIterate faster

A desktop workflow, not one-off scripts

Repetitive tasks - select a process, choose a DLL, inject, configure a hook, check results and clean up - live in one interface instead of scattered command-line utilities and throwaway scripts.

Flutter UIC++ coreRepeatable

Open source and inspectable

The project is open source, so developers and researchers can read the implementation, verify what the application does and decide whether it fits their own test environment before running it.

AuditableCommunity lineageGPL v3.0

How a session works

The same flow every time: pick a process, choose an action, configure it, run it and clean up. The screenshots above show the process grid, the hook configuration dialog and the unhook step.

1

Launch and load the process list

Open the app and let it populate the list of running processes. Use the reload option whenever process state changes.

2

Select the target process

Choose a process from the visual grid. Each entry shows the process name and PID, so the target is easy to identify.

3

Choose and configure the action

Pick Inject DLL, Utils, Unload Dll or Hook. Select a DLL file, enter a function name, choose a supported hook, or edit its parameters and block/pass behavior.

4

Run, then clean up

Apply the injection or hook and observe the process. When you are done, unhook functions and unload the DLL so the target is left in a clean state.

Supported WinAPI hooks

DLL Injector can hook 17 API functions across six categories. For supported hooks you can inspect and edit parameters such as match_path and lpFileName, and choose whether a call is passed through or blocked.

File operations

  • CreateFileW
  • ReadFile
  • WriteFile
  • DeleteFileW
  • MoveFileW
  • CopyFileW
  • CreateDirectoryW
  • RemoveDirectoryW

Observe or change file reads, writes, copies, moves and deletes, plus directory creation and removal - for example redirect a path or block a delete.

Registry operations

  • RegSetValueExW
  • RegCreateKeyExW

Watch registry keys being created and values being written, and test how an application reacts when that data is changed.

Process operations

  • OpenProcess
  • CreateProcessW
  • CreateRemoteThread

See processes being opened, launched, and injected into through remote-thread creation.

Memory

  • VirtualAllocEx

Detect memory being allocated inside other processes during runtime.

Library loading

  • GetProcAddress
  • LoadLibraryW

See which libraries a process loads and which exported functions it resolves.

Process termination

  • ExitProcess

Intercept a process exit request to study or control how termination is handled.

Hook notes

  • Hooks are configured after a DLL is injected into the target process.
  • Editable parameters let you redirect paths, change buffers, alter registry data or block selected operations.
  • Each hook can pass a call through unchanged or block it, depending on what you are testing.
  • Always unhook functions and unload modules before detaching - some hooks require a process restart if not removed cleanly.

Download and install

dll-injector.zip

WINDOWS · v1.0

The full desktop app: visual process grid, DLL injection, 17 WinAPI hooks, runtime parameter editing, exported-function checks and DLL unloading. Built with Flutter and C++ for 64-bit Windows 10 and 11.

Download dll-injector.zip

Antivirus or SmartScreen may flag injection tooling - this is expected for this class of software.

Before you start

A 64-bit Windows 10 or 11 system The Microsoft Visual C++ runtime (install it if the app reports a missing system DLL) Permission to run as the appropriate user - or as administrator for higher-integrity targets A folder to extract the downloaded archive into
1

Download the archive

Get dll-injector.zip from the card above. It is the genuine release file published on GitHub - nothing is repackaged.

2

Extract the files

Unzip the archive into a folder you control and keep the extracted files together. Allow it through SmartScreen or antivirus only if you trust the source.

3

Run the application

Launch the executable. Run it as administrator when you need to target processes running at a higher integrity level.

Authorized, responsible use

DLL Injector should only be used on systems and processes where you have permission. Run it in a dedicated test environment, unhook and unload before detaching, and never use it to tamper with software you don't own or to bypass protections, licensing, anti-cheat or security tools.

Authorized targets only

Inject into and hook only processes you own or are explicitly authorized to test. Injection and API hooking can destabilize software and trigger security controls when used carelessly.

Open source and inspectable

Because the project is open source, you can review exactly what the application does before running it - an advantage over closed, single-purpose injectors.

Use isolated lab environments

For untrusted code or malware analysis, work inside a virtual machine or disposable lab system with controlled networking. Avoid production and personal machines.

Frequently asked questions

What is a DLL injector?

A DLL injector is a tool that loads a dynamic-link library (DLL) into the address space of a separate running process, so the injected code runs inside that process. DLL Injector does this through a graphical interface, and also lets you hook WinAPI functions, check exported functions and unload DLLs from a target process.

What is DLL Injector used for?

It is used for authorized process testing: loading a custom DLL into a test process, checking whether an exported function is present, observing or modifying supported WinAPI calls, editing hook parameters and unloading modules during repeated development cycles. Typical users are developers, QA engineers, reverse engineers, security researchers and people learning system internals.

What is the difference between injecting a DLL and hooking a function?

Injecting a DLL loads your own library into a target process so its code runs there. Hooking intercepts a specific API call inside a process and applies configured behavior - for example matching a path, redirecting a file, blocking a delete or changing registry data. DLL Injector supports both, plus exported-function checks and module unloading, from one interface.

Is DLL Injector safe to use?

It is safe only when used correctly, on systems and processes where you have permission. Injection and API hooking are powerful low-level techniques that can crash applications, corrupt runtime state, or require a process restart if a hook is not removed cleanly. The recommended setup is a dedicated test machine, virtual machine or isolated lab environment.

Is DLL Injector legal?

It is a technical tool, and its legality depends on how it is used. Using it on your own systems, internal test applications, authorized research targets or lab environments is a normal, legitimate use case. Using it to tamper with third-party software, bypass protections, cheat in games, violate terms of service or access systems without permission may be illegal or prohibited.

Why does antivirus or SmartScreen flag it?

DLL injection and remote-thread creation are techniques also used by malware, so endpoint security tools and SmartScreen often flag any injector - including legitimate ones. Expect a warning, verify you trust the source, and run injection tooling only in environments where this behavior is acceptable.

How do I unload a DLL from a process?

Open the target process, list its loaded modules and attempt to unload the chosen DLL. Unloading is not guaranteed in every scenario, because the target process, module state, active threads and the system loader can all affect whether removal succeeds cleanly. Always unhook functions and unload modules before detaching from a process.

Which Windows versions and architectures does it support?

DLL Injector is a Windows-only application built around concepts such as process enumeration, loaded modules, exported functions and WinAPI hooking. It is intended for current 64-bit Windows 10 and 11 systems. It is not a macOS, Linux, Android or browser-based tool.

Does DLL Injector require administrator privileges?

Some operations require administrator privileges, especially when targeting protected processes or processes running at a higher integrity level. If access is denied, run the application as administrator. Even then, some system-protected or security-sensitive processes may remain unavailable or unstable as targets.

Which API functions can it hook?

It includes hook configuration for supported functions across file operations, registry operations, process operations, memory allocation, library loading and process termination - including CreateFileW, ReadFile, WriteFile, DeleteFileW, MoveFileW, CopyFileW, CreateDirectoryW, RemoveDirectoryW, RegSetValueExW, RegCreateKeyExW, OpenProcess, VirtualAllocEx, CreateProcessW, CreateRemoteThread, GetProcAddress, LoadLibraryW and ExitProcess.

Is DLL Injector free and open source?

Yes. DLL Injector is free and based on an open-source project. That matters for the intended audience: developers and researchers can inspect the source, understand the implementation and verify what the application does before using it in their own test environment.

Who created DLL Injector?

DLL Injector originates from an open-source project published by YashArote. It combines a Flutter-based desktop interface with C++ system-level functionality to make DLL injection, DLL unloading and selected hook workflows easier to use from a graphical interface.

Ready to start injecting?

Inject DLLs, hook and modify API calls, check exported functions and unload modules - from one focused desktop interface, in your own authorized test environment.

Download DLL Injector 1.0Read the FAQ