alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed IcedID Domain (ldrtoyota .casa in TLS SNI)"; flow:established,to_server; tls.sni; content:"ldrtoyota.casa"; bsize:14; reference:md5,b5e40801df5010e6c18e0ad81806adf7; classtype:trojan-activity; sid:2030658; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_08_05, deployment Perimeter, malware_family IcedID, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)