alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING MSI download request via curl (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".msi"; endswith; http.user_agent; content:"curl/"; startswith; fast_pattern; reference:md5,e145404c451df696bc9890528311d814; classtype:misc-activity; sid:2069609; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_06_02, deployment Perimeter, deployment SSLDecrypt, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2026_06_02; target:src_ip;)