On Thu, 2017-06-15 at 14:01 +1000, Michael D. Setzer II wrote: > > Later I found the crontab had a line that would run a script gcc.sh from the > /etc/cron.hourly folder. > Yes, you've been infected (the cronjob name was the clue). It's DDoS malware. It probably runs some /usr/lib library file (which again is not usual). I was looking into a report of this a few days ago, but there was little info I could find. Initial attack may have been through brute force SSH access (as reported by others).
I would at this point urge people to use RKH to monitor their cron (and 'at') systems. Monitoring something like '/var/spool/cron/*' and in particular the '/etc/crontab', '/etc/cron.d/*', '/etc/cron.daily/*, '/etc/cron.hourly/*' etc files and directories will help alert you to these sort of things soon after they happen (depending on how often you run RKH). John. -- John Horne | Senior Operations Analyst | Technology and Information Services University of Plymouth | Drake Circus | Plymouth | Devon | PL4 8AA | UK ________________________________ [http://www.plymouth.ac.uk/images/email_footer.gif]<http://www.plymouth.ac.uk/worldclass> This email and any files with it are confidential and intended solely for the use of the recipient to whom it is addressed. If you are not the intended recipient then copying, distribution or other use of the information contained is strictly prohibited and you should not rely on it. If you have received this email in error please let the sender know immediately and delete it from your system(s). Internet emails are not necessarily secure. While we take every care, Plymouth University accepts no responsibility for viruses and it is your responsibility to scan emails and their attachments. Plymouth University does not accept responsibility for any changes made after it was sent. Nothing in this email or its attachments constitutes an order for goods or services unless accompanied by an official order form. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Rkhunter-users mailing list Rkhunter-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rkhunter-users
