alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Latrodectus Alive Response M6"; flow:established,to_client; flowbits:isset,ET.Latrodectus.alive; http.stat_code; content:"200"; http.server; content:"nginx/"; startswith; file.data; bsize:13; content:"10,1"; startswith; fast_pattern; pcre:"/^10,1[0-9]{9}$/"; classtype:trojan-activity; sid:2049704; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_12_15, deployment Perimeter, malware_family Latrodectus, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_15; target:dest_ip;)