This module exploits unauthenticated simple web backdoor shells by leveraging the common backdoor shell's vulnerable parameter to execute commands. The SecLists project of Daniel Miessler and Jason Haddix has a lot of samples for these kind of backdoor shells which is categorized under Payloads.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.
– Jim O’Gorman | President, Offensive Security