alert http $EXTERNAL_NET any -> any any (msg:"ET SCAN Zmap User-Agent (Inbound)"; flow:established,to_server; http.user_agent; content:"Mozilla/5.0 zgrab/0.x"; startswith; endswith; classtype:network-scan; sid:2029054; rev:3; metadata:created_at 2019_11_26, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13;)