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;
)