alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Generic Mailer Check Accessed on Internal Server"; flow:established,to_client; file.data; content:"Upload is <b><"; content:"Check Mailling ..<br>"; nocase; distance:0; fast_pattern; content:"<input type=|22|submit|22 20|value=|22|Send test >>|22|>"; nocase; distance:0; classtype:web-application-attack; sid:2030064; rev:2; metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_29, deployment Perimeter, confidence Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_29;)