alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (
msg:"ET WEB_SERVER Generic PHP Mailer Accessed on Internal Compromised Server";
flow:established,to_client;
file.data;
content:"<title>Priv8 Mailer Inbox"; nocase; fast_pattern;
content:"document.getElementById(|22|xmailer"; nocase; distance:0;
classtype:web-application-attack;
sid:2029951; rev:2;
metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_17, deployment Perimeter, confidence Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_17;
)