alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MacSync Stealer Exfil (PUT)"; flow:established,to_server; http.method; content:"PUT"; http.uri; content:"|2f|gate|3f|buildtxd|3d|"; startswith; fast_pattern; content:"&upload_id="; content:"&chunk_index="; content:"&total_chunks"; http.user_agent; content:"Macintosh"; classtype:command-and-control; sid:2069444; rev:1; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_05_27, deployment Perimeter, deployment SSLDecrypt, malware_family MacSync, confidence High, signature_severity Critical, tag c2, updated_at 2026_05_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)