alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Unknown Trojan POST"; flow:established,to_server; content:"POST"; http_method; content:"Content-Length|3a| 0|0d 0a|"; http_header; content:"/a/"; http_uri; fast_pattern; content:"PHPSESSID="; http_cookie; content:!"Referer|3a 20|"; http_header; classtype:trojan-activity; sid:2016834; rev:2; metadata:created_at 2013_05_08, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)