alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed BLINDINGCAN Domain (www .ne-ba .org in TLS SNI)"; flow:established,to_server; tls.sni; content:"www.ne-ba.org"; bsize:13; fast_pattern; reference:url,blogs.jpcert.or.jp/en/2020/09/BLINDINGCAN.html; classtype:domain-c2; sid:2030931; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_09_30, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_31, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)