Windows Userinit persistence

[6a6f656c]

fixes #20820

Introduces a new persistence module that abuses the Windows UserInit registry mechanism, ensuring a shell is executed each time a user logs in.

Verification

List the steps needed to make sure this thing works

1. get an admin session on windows
2. use exploit/windows/persistence/registry_userinit
3. set session #
4. exploit
5. logoff and log back in, you should get a shell

[github-actions]

Thanks for your pull request! Before this can be merged, we need the following documentation for your module:

• Writing Module Documentation
• Template
• Examples

[h00die]

I had a few minutes, so did the docs for you: 6a6f656c#1

[6a6f656c]

Reviewed