alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DarkHotel Initial Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?type=creation"; fast_pattern; content:"result="; distance:1; content:"&info="; distance:0; http.header_names; content:!"Referer|0d 0a|"; reference:url,securelist.com/blog/research/71713/darkhotels-attacks-in-2015/; classtype:targeted-activity; sid:2021610; rev:3; metadata:attack_target Client_Endpoint, created_at 2015_08_11, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_05_29, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)