alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Medfos Connectivity Check"; flow:established,to_server; http.uri; content:"/uploading/id="; fast_pattern; http.uri.raw; pcre:"/^\/uploading\/id=\d{2,20}&u=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; http.header_names; content:!"Referer|0d 0a|"; classtype:misc-activity; sid:2016800; rev:8; metadata:created_at 2013_05_01, signature_severity Major, updated_at 2020_09_18;)