alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Latrodectus 404 Response"; flow:established,to_client; http.stat_code; content:"404"; http.server; content:"nginx/"; startswith; file.data; content:"<TITLE>404 Not Found</TITLE>|0a 20 20|"; fast_pattern; content:"</BODY></HTML>"; distance:0; pcre:"/^(?:\r\n){50}$/R"; classtype:trojan-activity; sid:2049233; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_11_15, deployment Perimeter, malware_family Latrodectus, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_15; target:dest_ip;)