alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Generic Webshell Observed Outbound"; flow:established,to_client; http.stat_code; content:"200"; file.data; content:"<form action=|22 22 20|"; content:"<input|20|type=|22|text|22 20|name=|22|_jy|22|><input|20|type=|22|submit|22 20|value=|22|>>"; fast_pattern; classtype:attempted-admin; sid:2031651; rev:1; metadata:attack_target Web_Server, created_at 2021_02_23, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_02_23;)