alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE AMOS Stealer CnC Checkin (POST)"; flow:established,to_server; urilen:8; http.method; content:"POST"; http.uri; content:"/contact"; http.user_agent; content:"curl"; startswith; http.header_names; content:"|0d 0a|user|0d 0a|BuildID|0d 0a|cl|0d 0a|cn|0d 0a|"; fast_pattern; reference:md5,e6899ff5b47f01113c522ca1e0a405c3; classtype:command-and-control; sid:2061835; rev:1; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_04_23, deployment Perimeter, malware_family AMOSStealer, confidence High, signature_severity Critical, tag c2, updated_at 2025_04_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)