alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE 123Stealer Obfuscated CnC Exfil (POST) M1"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:47; content:"/api/reobf/"; startswith; fast_pattern; http.content_type; content:"application/json"; http.request_body; content:"function|20 5f|0x"; reference:md5,544be46f232f0cacecf73cc1be65ce62; classtype:command-and-control; sid:2066684; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_01_12, deployment Perimeter, deployment SSLDecrypt, malware_family 123Stealer, confidence High, signature_severity Critical, tag c2, updated_at 2026_01_12, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)