alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE UNK_FlappyBird Domain in TLS SNI (onnetmais .org)"; flow:established,to_server; tls.sni; bsize:13; content:"onnetmais.org"; fast_pattern; classtype:domain-c2; sid:2058396; rev:6; metadata:attack_target Client_Endpoint, created_at 2024_12_18, deployment Perimeter, former_category PHISHING, malware_family UNK_FlappyBird, confidence High, signature_severity Major, tag SSL_TLS_SNI, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)