Added a section to improve the Desktop file persistence by letting the use remove previous persistence mechanisms. Checks to see if the FileName exists and if so removes it.
Creating persistence by adding the python launcher to the ~/.config/autostart directory. This is based on the CrossRat analysis (https://digitasecurity.com/blog/2018/01/23/crossrat/) and the other links in the comments.
Tested in Ubuntu 16 and Oracle Linux 7.
Updated the crontab persistence so that the Hour option sets the Hour rather than the minute option. This make the crontab execute every 24 hours rather than ever x minutes.
xorrior