ET MALWARE 123Stealer Obfuscated CnC Exfil (POST) M1

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;
)