alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Generic Mailer Accessed on External Server"; flow:established,to_client; file.data; content:"<title>Cazanova SMTP Mailer"; nocase; content:">Cazanova SMTP Mailer</div>"; nocase; distance:0; classtype:web-application-attack; sid:2030059; rev:2; metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_29, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_29;)