Joomla! 3.4.4 and 3.6.3 exploit unauthorised users and escalated privileges hack

http://www.joomlaexpert.ie/joomla-news-tips/item/243-joomla-3-4-4-and-3-6-3-exploit-unauthorised-users-and-escalated-privileges-hack.html
Some of the signs that your #joomla site has been hacked by the recent escalation of privilege attack: