alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.Nurjax Checkin"; flow:established,to_server; http.uri; content:"update.php?"; content:"&key="; distance:0; content:"&dummy="; fast_pattern; distance:0; http.header_names; content:!"Referer"; reference:md5,1837561f9537d2fcc2b4f0ea6fd3a095; reference:url,www.symantec.com/security_response/writeup.jsp?docid=2014-121000-1027-99&tabid=2; classtype:command-and-control; sid:2020034; rev:4; metadata:created_at 2014_12_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_18;)