alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT Possible Oracle Opera RCE Attempt (CVE-2023-21932)"; flow:established; http.method; content:"POST"; http.uri; content:"/Operajserv/webarchive/FileReceiver?filename="; fast_pattern; nocase; startswith; pcre:"/^[a-zA-Z]\x3a\x5cMICROS\x5c/R"; content:"&jndiname="; distance:0; content:"&username="; distance:0; http.content_type; content:"multipart/form-data|3b 20|boundary="; startswith; http.header_names; content:!"Referer|0d 0a|"; reference:url,blog.assetnote.io/2023/04/30/rce-oracle-opera/; reference:cve,2023-21932; classtype:attempted-admin; sid:2045307; rev:1; metadata:attack_target Web_Server, created_at 2023_05_03, cve CVE_2023_21932, deployment Perimeter, performance_impact Low, confidence Low, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_03;)