alert http $HOME_NET any -> $EXTERNAL_NET !80 (msg:"ET MALWARE W32/Farfli.BHQ!tr Dropper CnC Beacon 2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/do.asp?search="; fast_pattern; http.header; pcre:"/^Host\x3A\x20\d{1,3}\x2E\d{1,3}\x2E\d{1,3}\x2E\d{1,3}\x3A\d{1,5}\r?$/mi"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,93be88ad3816c19d74155f8cd3aae1d2; classtype:command-and-control; sid:2020913; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_04_15, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_11_19, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)