some things are cron jobs. one of which is logrotate.

find is not usually a cron job. why would it be? find is to find a file or folder. why make a cron job out of that?

my suspicion is that someone has hacked into your system. obviously, there not very good or you wouldnt have noticed them.

edit your /etc/securetty and comment out everything (except maybe tty7. thats the one the system uses for X windows).

change your passwords.

tell X windows to tcp-nolisten. /etc/X11/xdm/Xservers

http://mandrakeusers.org/index.php?showtopic=13265 (a security overview i wrote).

uninstall any server (and there are quite a few).