alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Generic Mailer Accessed on Internal Server"; flow:established,to_client; file.data; content:"<title>:: Mailer Inbox"; fast_pattern; content:"document.getElementById(|22|emails|22|"; distance:0; content:"document.getElementById(|22|txtml|22|"; distance:0; classtype:web-application-attack; sid:2030544; rev:2; metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_07_16, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_16;)