alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Glupteba Download"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"|25|"; content:"-rtmd-"; nocase; fast_pattern; content:".exe"; bsize:>50; http.header_names; content:!"Referer"; reference:url,news.sophos.com/wp-content/uploads/2020/06/glupteba_final-1.pdf; reference:md5,e39362df0a751289b6f65b3448ae38f4; classtype:trojan-activity; sid:2030435; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_07_01, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_01;)