Thanks for the shout out. This is Dev from the team that just released Ranger at BSides Charm this weekend. Happy to get Chris and Jon involved if anyone has some questions.
I begin by saying promise I read the README :-) but is that something that is run on an attackers machine, or does it rely on running on the target machine itself?
No worries - Ranger would run on the "attackers" machine. You have to specify the delivery method (wmiexec, psexec, smbexec or atexec) which Ranger utilizes to access the target machine and execute the attack.
Sorry in advance if that's a silly question.