alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE SuperSocialat Plugin Backdoor Code Execution Attempt"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/wp-content"; startswith; content:"/plugins/super-socialat/super_socialat.php?dl="; fast_pattern; pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/Ri"; classtype:command-and-control; sid:2028992; rev:1; metadata:affected_product Wordpress_Plugins, created_at 2019_11_18, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_11_18;)