alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE UpDocX Checkin"; flow:established,to_server; http.uri; content:"/up_docx.php"; fast_pattern; http.header_names; content:!"Referer"; reference:url,pwc.blogs.com/cyber_security_updates/2015/06/unfin4ished-business.html; classtype:command-and-control; sid:2021376; rev:4; metadata:created_at 2015_07_02, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_01;)