alert http $EXTERNAL_NET any -> any any (msg:"ET SCAN ELF/Mirai Variant User-Agent (Inbound)"; flow:established,to_server; http.user_agent; content:"Katana/"; fast_pattern; startswith; classtype:attempted-admin; sid:2030909; rev:2; metadata:affected_product Linux, attack_target IoT, created_at 2020_09_28, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_28;)