Once we have access to a compromised system there are a few ways one can go about increasing your foothold on the system for future return access, a.k.a. persistence. This serves as a way back in should the system be updated or patched rendering the original exploited entry path useless (perhaps you patched yourself to keep other hackers out :p). Persistence can be done in a many ways with many methods, but today I will be explaining how we can take advantage of cron to use cron jobs to create one more layer of persistence using a scheduled backdoor. I will outline things for you an as easiest way possible with basic explanation of cron as I understand it and you should be able to tweak things when done to fit your specific need or clever idea for even more evil trickery 