alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ELF/Mirai Variant UA Outbound (Yowai)"; flow:established,to_server; http.user_agent; content:"Yowai"; nocase; startswith; pcre:"/^Yowai(?:\/[0-9]\.0)?$/i"; classtype:trojan-activity; sid:2027123; rev:4; metadata:affected_product Linux, attack_target IoT, created_at 2019_03_27, deployment Perimeter, malware_family Mirai, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_04_13;)