alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Malicious Macro DL BIN May 2016 (No UA)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/system/"; depth:8; nocase; fast_pattern; pcre:"/^(?:cache|logs)\/[^\x2f]+\.(?:exe|dll|doc|bin)$/Ri"; http.header_names; content:!"Referer"; reference:md5,c6747ca29d5c28f4349a5a8343d6b025; classtype:trojan-activity; sid:2022834; rev:6; metadata:created_at 2016_05_24, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_17;)