if your ""victims "" are windows-machine for persistence run another ways:
1) stupid_basic....&..more... but effective ...upload the same payload (created previously &tested..with veil.py )...in windows AUTOSTART folder
2) Technic-way...(i think
)
after have a meterpreter:
-if windows-machine have enable UAC ....bypass it.....
-get administrator privileges (privilege-escalation).....
-interact with windows\system32.....
-add a new-viral-key/process in.... HKLM\\software\\microsoft\\windows\\currentversion \\run
bye