alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Maldoc Domain (travelcrimea .info in TLS SNI)"; flow:established,to_server; tls.sni; content:"travelcrimea.info"; bsize:20; fast_pattern; reference:md5,126110a4b240f1fedba2ff8d3d8e2ebe; reference:url,twitter.com/h2jazi/status/1490829405106569217; classtype:domain-c2; sid:2035135; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_02_08, deployment Perimeter, malware_family Maldoc, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_09, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)