alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ATTACK_RESPONSE WSO - WebShell Activity - WSO Title"; flow:established,to_client; file_data; content:"<title>"; content:" - WSO "; fast_pattern; distance:0; content:"</title>"; distance:0; classtype:attempted-user; sid:2015905; rev:3; metadata:created_at 2012_11_21, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)