alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.Nurjax Downloading PE"; flow:established,to_server; http.uri; content:".exe?dummy="; fast_pattern; pcre:"/\.exe\?dummy=\d+$/"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,6b7759565454fb7d02fb5bc638136f31; classtype:trojan-activity; sid:2020032; rev:4; metadata:created_at 2014_12_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_29;)