alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DefendNot Installer User-Agent Observed"; flow:established,to_server; http.user_agent; content:"defendnot-install/"; startswith; fast_pattern; reference:url,github.com/es3n1n/defendnot; classtype:trojan-activity; sid:2068057; 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_03_06, deployment Perimeter, deployment SSLDecrypt, malware_family DefendNot, confidence High, signature_severity Major, updated_at 2026_03_06; target:src_ip;)