alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/HydraCrypt CnC Beacon 1"; flow:established,to_server; urilen:11; http.method; content:"GET"; http.uri; content:"/flamme.php"; fast_pattern; http.header; content:"Cache-Control|3a 20|no-cache"; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a|Cache-Control|0d 0a 0d 0a|"; startswith; http.connection; content:"Keep-Alive"; bsize:10; classtype:command-and-control; sid:2022495; rev:4; metadata:attack_target Client_Endpoint, created_at 2016_02_08, deployment Perimeter, malware_family Win32_HydraCrypt, confidence High, signature_severity Major, tag c2, updated_at 2020_10_05, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)