alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (
msg:"ET WEB_SERVER Generic Mailer Accessed on Internal Compromised Server";
flow:established,to_client;
file.data;
content:"<title>Priv8 Mailer"; fast_pattern;
content:"document.getElementById(|22|sender-email|22|"; distance:0;
content:"document.getElementById(|22|xmailer|22|"; distance:0;
classtype:web-application-attack;
sid:2031079; rev:2;
metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_10_22, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_22;
)