alert http $EXTERNAL_NET any -> any any (msg:"ET EXPLOIT Yachtcontrol Webservers RCE CVE-2019-17270 (Inbound)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/pages/sytemcall.php?command=|7c|"; depth:30; fast_pattern; reference:url,unit42.paloaltonetworks.com/mirai-variant-echobot-resurfaces-with-13-previously-unexploited-vulnerabilities/; reference:cve,2019-17270; classtype:attempted-admin; sid:2029153; rev:2; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2019_12_16, cve CVE_2019_17270, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_26;)