alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.Nurjax Retrieving Domains via JS"; flow:established,to_server; http.uri; content:".txt?dummy="; fast_pattern; pcre:"/^\d+$/R"; http.user_agent; content:"Mozilla"; depth:7; http.header_names; content:!"Accept-"; content:!"Referer"; reference:md5,1837561f9537d2fcc2b4f0ea6fd3a095; classtype:trojan-activity; sid:2020031; rev:5; metadata:created_at 2014_12_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_17;)