alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Odyssey Stealer CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/api/v1/bot/joinsystem/"; fast_pattern; startswith; reference:url,censys.com/blog/odyssey-stealer-macos-crypto-stealing-operation; classtype:trojan-activity; sid:2067743; rev:1; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_02_17, deployment Perimeter, malware_family Odyssey_Stealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2026_02_17, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)