alert http $EXTERNAL_NET any -> any any (msg:"ET SCAN ELF/Mirai Variant User-Agent (Inbound)"; flow:established,to_server; http.user_agent; bsize:3; content:"XTC"; fast_pattern; classtype:attempted-admin; sid:2029790; rev:4; metadata:affected_product Linux, attack_target IoT, created_at 2020_04_02, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_08;)