Auto-Root Android Malware

Hello everyone

I am currently working on how can I take access on android devices with metasploit in kali linux. I have create a malicious apk (some posts here helped me to :) ) I have installed it on my android and everything works fine with the metepreter session...except when I try to navigate on root directory says access denied...I search it on google and it's because my device is not rooted. I know that I can root my device by myself with some programs that I can find on the internet but I would like to check if this can be done automatically/remotelly I made a quick search on google and I find out that there is a new malware that can auto-root any android device automatically once is installed...I searched for it but I found nothing...Does anyone knows how this works? or knows any other way that I can root my phone remotelly? or at least gain root privileges on my meterpreter session without rooting my device! Thanks in advance :)