alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Owl PHPMailer Accessed on External Server"; flow:established,to_client; file.data; content:"<title>Owl PHPMailer"; fast_pattern; content:"function stopSending()"; content:"function startSending()"; classtype:web-application-attack; sid:2029906; rev:2; metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_14, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_14;)