alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Dooptroop CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?num="; fast_pattern; content:"&rev="; distance:0; pcre:"/^\/[a-z]+\.php\?num=\d+&rev=/"; http.header_names; content:!"Referer"; reference:url,blog.eset.com/2012/03/17/drive-by-ftp-a-new-view-of-cve-2011-3544; classtype:command-and-control; sid:2014112; rev:6; metadata:attack_target Client_Endpoint, created_at 2012_01_10, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_08_18, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)