alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Dooptroop Dropper Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/nconfirm.php?"; fast_pattern; content:"rev="; distance:0; content:"code="; content:"param="; content:"num="; http.header_names; content:!"Referer|0d 0a|"; reference:url,blog.eset.com/2012/03/17/drive-by-ftp-a-new-view-of-cve-2011-3544; classtype:command-and-control; sid:2013808; rev:5; metadata:created_at 2011_04_07, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_03;)