alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Generic Webshell Accessed on Internal Compromised Server"; flow:established,to_client; file.data; content:"<font><font>file Manager</font></font>"; nocase; distance:0; content:"<font><font>Back Connect"; nocase; distance:0; content:"<font><font>CgiShell</font></font>"; nocase; distance:0; content:"<font><font>Symlink</font></font>"; nocase; distance:0; content:"Mailer</font></font>"; nocase; distance:0; content:"<font><font>Auto r00t</font></font>"; nocase; distance:0; content:"<font><font>Upload</font></font>"; nocase; distance:0; content:"Exploiter & scan Tools</font></font>"; nocase; distance:0; fast_pattern; content:"<font><font>Self remove</font></font>"; nocase; distance:0; classtype:web-application-attack; sid:2029917; rev:2; metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_15, deployment Perimeter, confidence Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_15;)