alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed MarkiRAT Domain (comesite .website in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".comesite.website"; endswith; fast_pattern; reference:url,www.recordedfuture.com/research/nexus-tag182-disseminates-markirat; classtype:domain-c2; sid:2070166; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2026_07_02, deployment Perimeter, malware_family MarkiRAT, performance_impact Low, confidence High, signature_severity Major, tag TAG_182, updated_at 2026_07_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)