alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE OtterCookie CnC Command Inbound (whour)"; flow:established,to_client; http.response_body; content:"|7b 22|sid|22 3a 22|"; depth:13; pcre:"/^[a-zA-Z0-9]{20}\x22\x7d/R"; content:"|5b 22|whour|22 5d|"; endswith; fast_pattern; reference:url,jp.security.ntt/tech_blog/en-contagious-interview-ottercookie; classtype:command-and-control; sid:2060635; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_03_05, deployment Perimeter, malware_family OtterCookie, confidence High, signature_severity Critical, tag c2, updated_at 2025_03_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:dest_ip;)