alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Xema dropping file"; flow:to_server,established; http.uri; content:"/pruebas.doc"; fast_pattern; http.header_names; content:!"Referer"; reference:md5,f5fbdb120594f4da7f638122d6635933; classtype:trojan-activity; sid:2018994; rev:4; metadata:created_at 2014_08_25, malware_family Win32_Xema, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_25;)