Hi
Great question! Thanks for asking. I found several references online to those files being created by Installatron that looks to be a tool offered by hosting providers who have 'one click' installations of software, like wordpress, joomla , etc. Does your hosting provider use that software? Check your control panel and let us know. You could send me a zipped copy of that file to tim [at] wordfence.com and I could take a look and see whats in it and offer an opinion.
Thanks!
tim