LittleCorporal

LittleCorporal: A C# Automated Maldoc Generator

C:\LittleCorporal\bin\Debug>LittleCorporal.exe C:\Users\ANON\Desktop\beacon.bin explorer.exe
.____    .__  __    __  .__         _________                                         .__
|    |   |__|/  |__/  |_|  |   ____ \_   ___ \  _________________   ________________  |  |
|    |   |  \   __\   __\  | _/ __ \/    \  \/ /  _ \_  __ \____ \ /  _ \_  __ \__  \ |  |
|    |___|  ||  |  |  | |  |_\  ___/\     \___(  <_> )  | \/  |_> >  <_> )  | \// __ \|  |__
| _______ \__||__|  |__| |____/\___  >\______  /\____/|__|  |   __/ \____/|__|  (____  /____/
        \/                        \/        \/             |__|                     \/


             ________
            /        \
         __ /       (o)\__
        /     ______\   \                   I am the strongest debater in the whole Conseil.
        | ____/__  __\____|                 I let myself be attacked, because I know how to defend myself.
           [  --~~--  ]                                                              - Napoleon Bonaparte
            | (  L   )|
      ___----\  __  /----___
     /   |  < \____/ >   |   \
    /    |   < \--/ >    |    \
    ||||||    \ \/ /     ||||||
    |          \  /   o       |
    |     |     \/   === |    |
    |     |      |o  ||| |    |
    |     \______|   +#* |    |
    |            |o      |    |
     \           |      /     /
     |\__________|o    /     /
     |           |    /     /

[+] Parsed Arguments:
   [>] Shellcode Path: C:\Users\ANON\Desktop\beacon.bin
   [>] Target Process: explorer.exe

[+] Embedded shellcode in Loader.cs!
[+] Generated C# Loader artifact!
[+] Ran the .NET assembly through Donut!
[+] Donut artifact is located at: C:\Users\ANON\Desktop\LittleCorporal\Artifacts\payload.bin
[+] Path to Word document: C:\Users\ANON\Desktop\LittleCorporal\Artifacts\Form.doc

How It Works?

LittleCorporal accepts a user-supplied argument for a process to inject into on a remote machine, in which you plan to execute the malicious Word document on, and also accepts a path to a local shellcode file stored in .bin format - such as a Beacon Stageless shellcode blob. LittleCorporal embeds the shellcode and the target process into Loader.cs and then utilizes thread hijacking to perform remote process injection. LittleCorporal then compiles the updates Loader.cs into a .NET .exe artifact and then sends the artifact through Donut to generate position independent shellcode, which will execute the .exe. The shellcode generated by Donut is then base64 encoded, a Word document is generated, and the final Donut blob is stored in an InlineShape.AlternativeText Word property, which is able to hold the entire payload. This is done by inserting an image (currently a blank image, giving the document a "blank" look) property into the Word document, as alternative text on the image, which contains the payload. LittleCorporal then leverages a VBA "template", contained in this project as a text file, and injects this Macro into the newly generated Word document. The Macro is named autoopen, so it opens upon the document opening, and then is configured to extract the value of the alternative text of the previously generated image, which contains the final payload, base64 decodes it, and finally uses Windows API calls, in VBA, to perform local injection into Word. In essence, this project uses a simple "loader" in VBA to perform local injection into Word, which is a bit less scrutinized than remote process injection, and then uses execution from the simple local injection injection to execute the Donut shellcode, which is another loader that performs thread hijacking for the final remote process injection of the user-supplied shellcode into the user supecified process. This is all done in an automated fashion, including generation of the Word document.

Usage

1. YOU MUST FETCH THE ENTIRE PROJECT IN ORDER TO USE! LittleCorporal uses relative paths for additional resources, such as Donut.
2. Once obtaining the entire project, change your working directory to the bin\Debug directory (cd C:\Path\to\LittleCorporal\bin\Debug)
3. Specify the path to your shellcode file and the process on the remote machine which you would like to inject into. The process specified must already be running! (LittleCorporal.exe C:\Path\To\Shellcode.bin explorer.exe)
4. LittleCorporal will then output the path to the final Word document