alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Generic Webshell Accessed on External Server"; flow:established,to_client; file.data; content:"<form method=post style=|22|font-family:fantasy|3b 22|>"; content:"Password: <input type=password name=pass style=|22|background-color|3a|whitesmoke|3b|border|3a|1px solid #FFF|3b 22|><input type=submit value='>>' style=|22|border|3a|none|3b|background-color|3a|"; nocase; distance:0; fast_pattern; classtype:web-application-attack; sid:2030065; rev:2; metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_29, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_29;)