alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING User-Agent Contains Custom String (Example/1.0)"; flow:established,to_server; http.user_agent; content:"Example/1.0"; endswith; reference:md5,2c19001d5b81037ac70ef17f887cbec0; classtype:unknown; sid:2064127; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_08_22, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_22; target:src_ip;)