alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE OtterCookie CnC Checkin Response"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; content:"|22|list|22|"; content:"|22|id|22|"; content:"|22|OS|22|"; content:"|22|platform|22|"; content:"|22|release|22|"; content:"|22|host|22|"; content:"|22|userInfo|22 3a 7b 22|uid|22 3a|"; fast_pattern; pcre:"/^(?:\x2d)?\d{1,}\x2c\x22/R"; reference:url,blackpointcyber.com/blog/malicious-node-package-deploys-ottercookie/; classtype:trojan-activity; sid:2065866; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_11_20, deployment Perimeter, malware_family OtterCookie, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_20, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)