alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Fake FedEX/Pony spam campaign URI Struct"; flow:established,to_server; content:".php?label="; http_uri; nocase; fast_pattern:only; pcre:"/\.php\?label=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/Ui"; content:!"dynamicdrive.com"; nocase; http_header; classtype:trojan-activity; sid:2017258; rev:5; metadata:created_at 2013_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)