alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE OtterCookie Payload Request"; flow:established,to_server; urilen:51; http.method; content:"GET"; http.uri; content:"/api/service/token/"; startswith; fast_pattern; pcre:"/^[0-9a-z]{32}$/R"; http.user_agent; content:"axios"; startswith; reference:url,jp.security.ntt/tech_blog/en-contagious-interview-ottercookie; classtype:command-and-control; sid:2060644; 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 Major, tag c2, tag Description_Generated_By_Proofpoint_Nexus, 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:src_ip;)