alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Katana Botnet Domain (imsowiwiwiwiwi .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".imsowiwiwiwiwi.com"; endswith; fast_pattern; reference:url,github.com/deepfield/public-research/blob/main/katana/iocs/domains.csv; classtype:domain-c2; sid:2068285; rev:1; metadata:affected_product Android, attack_target IoT, created_at 2026_03_17, deployment Perimeter, malware_family Katana, performance_impact Low, confidence High, signature_severity Major, updated_at 2026_03_17, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)