alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Maldoc CnC Domain (cloud-documents .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"cloud-documents.com"; bsize:19; fast_pattern; reference:url,blog.malwarebytes.com/threat-intelligence/2021/07/crimea-manifesto-deploys-vba-rat-using-double-attack-vectors/; classtype:domain-c2; sid:2033664; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_08_04, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)