alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT Nuuo NVR RCE Attempt (CVE-2018-15716)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"_handle.php?cmd=getupgradinginfo"; fast_pattern; endswith; classtype:attempted-admin; sid:2026982; rev:3; metadata:created_at 2019_02_26, cve CVE_2018_15716, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_09_16;)