alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE OtterCookie File Exfiltration M1"; flow:established,to_server; urilen:7; http.method; content:"POST"; http.uri; content:"/upload"; http.user_agent; content:"curl"; startswith; http.header_names; content:"|0d 0a|path|0d 0a|"; nocase; content:"|0d 0a|hostname|0d 0a|"; nocase; content:"|0d 0a|userkey|0d 0a|"; nocase; http.header; content:"path|3a 20|C|3a 5c|Users|5c|"; fast_pattern; content:"|0d 0a|userkey|3a|"; http.request_body; content:"name|3d 22|file|22 3b 20|filename|3d 22|"; reference:url,jp.security.ntt/tech_blog/en-contagious-interview-ottercookie; classtype:command-and-control; sid:2060638; rev:1; metadata: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 TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1567, mitre_technique_name Exfiltration_Over_Web_Service; target:src_ip;)