alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed BazarLoader Domain (vighik .xyz in TLS SNI)"; flow:established,to_server; tls.sni; content:"vighik.xyz"; bsize:10; fast_pattern; reference:url,github.com/blacklotuslabs/IOCs/blob/main/domains_assoc_ryuk.txt; classtype:domain-c2; sid:2031150; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_10_30, deployment Perimeter, malware_family BazarLoader, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)