/invoker

Penetration testing utility.

Primary LanguageC++MIT LicenseMIT

Invoker

Penetration testing utility.

The goal is to use this tool when access to some Windows OS features through GUI is restricted.

Some features require administrative privileges.

Capabilities:

  • invoke the Command Prompt and PowerShell,
  • download a file,
  • add a registry key,
  • schedule a task,
  • connect to a remote host,
  • terminate a running process,
  • run a new process,
  • inject bytecode into a running process,
  • inject DLL into a running process,
  • enable access token privileges,
  • duplicate access token of a running process,
  • list unquoted service paths and restart a running service,
  • replace Sticky Keys.

Built with Dev-C++ IDE v5.11 (64-bit), compiled with TDM-GCC v4.9.2 (32-bit and 64-bit) and tested on Windows 10 Enterprise OS (64-bit). Download Dev-C++ from here.

Made for educational purposes. I hope it will help!

Future plans:

  • DLL Hijacking,
  • DLL Proxying.

Invoker Library

Check all the capabilities here. Feel free to use the library.

PowerShell Scripts

Check all the PowerShell scripts used in the main C++ program here.

How to Run

Run '\exec\Invoker_x86.exe' (32-bit) or '\exec\Invoker_x64.exe' (64-bit).

32-bit Invoker can only inject:

  • a 32-bit bytecode into a 32-bit process,
  • a 32-bit DLL into a 32-bit process.

64-bit Invoker can only inject:

  • a 32-bit bytecode into a 32-bit process,
  • a 64-bit bytecode into a 64-bit process,
  • a 32-bit DLL into a 32-bit process,
  • a 64-bit DLL into a 64-bit process.

Bytecode Injection

Elevate privileges by injecting bytecode into a higher-privileged process.

This tool can parse an HTTP response and extract the payload from a custom element, i.e. from <img class="bc" src="data:image/gif;base64,payload" alt="bc" hidden="hidden"> where payload is a binary code/file encoded in Base64.

This might be useful if antivirus is constantly deleting your local payloads.

You can also specify your own custom element but you will have to modify the program source code and recompile it.

Check an example at pastebin.com/raw/Nd1tCBv6.

Bytecode provided will most certainly not work for you.

Too see if a process is 32-bit or 64-bit open up Task Manager -> click on More details -> go to Details tab -> right click on any of the columns -> click on Select columns -> check the Platform checkbox.

Additionally, to see if a process is running with administrative privileges check the Elevated checkbox.

Generate a Reverse Shell Payload

Find out how to generate a reverse shell payload from my other project.

Get the LocalSystem Account (NT AUTHORITY\SYSTEM)

Run the Invoker as administrator.

Enable all access token privileges.

Duplicate the access token from e.g. Windows Logon Application (winlogon.exe) and run a new instance of Invoker.

Within the new Invoker instance, open the Command Prompt and run whoami, you should now see nt authority\system.

Enable all access token privileges once again.

Close the old Invoker instance.

P.S. You get more access token privileges from Local Security Authority Subsystem Service (lsass.exe).

Images

Invoker

Figure 1 - Invoker

Add/Edit Registry Key

Figure 2 - Add/Edit Registry Key

Bytecode Injection

Figure 3 - Bytecode Injection

Elevated Privileges

Figure 4 - Elevated Privileges