This Metasploit module exploits a default Vagrant synced folder (shared folder) to append a Ruby payload to the Vagrant project Vagrantfile config file. By default, unless a Vagrant project explicitly disables shared folders, Vagrant mounts the project directory on the host as a writable vagrant directory on the guest virtual machine. This directory includes the project Vagrantfile configuration file. Ruby code within the Vagrantfile is loaded and executed when a user runs any vagrant command from the project directory on the host, leading to execution of Ruby code on the host.