alert http $EXTERNAL_NET any -> $HOME_NET any (
msg:"ET WEB_CLIENT Anonymous Webshell Accessed on External Compromised Server";
flow:established,to_client;
file.data;
content:"<title>AnonyMous SHell</title>"; nocase; fast_pattern;
content:"id=|22|pageheading|22|>AnonyMous SHell"; nocase; distance:0;
classtype:web-application-attack;
sid:2029886; rev:2;
metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_13, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_13;
)