ET MALWARE StealC_V2 CnC Activity (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE StealC_V2 CnC Activity (POST)";
    flow:established,to_server;
    urilen:<24;
    http.method;
    content:"POST";
    http.uri;
    pcre:"/^\x2f(?:[a-z0-9]{14,19})\x2ephp$/";
    http.header_names; bsize:67;
    content:"|0d 0a|content-type|0d 0a|host|0d 0a|content-length|0d 0a|connection|0d 0a|cache-control|0d 0a 0d 0a|"; nocase; fast_pattern;
    http.content_type;
    content:"application/json";
    http.content_len; bsize:3;
    pcre:"/^\d{3}$/";
    http.connection;
    content:"Keep-Alive";
    http.header;
    content:"Cache|2d|Control|3a20|no|2d|cache";
    http.request_body;
    pcre:"/^(?:[a-zA-Z0-9\x2b\x2f\x3d]){100}/";
    classtype:command-and-control;
    sid:2066280; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_12_11, deployment Perimeter, deployment SSLDecrypt, malware_family Stealc, performance_impact Moderate, confidence High, signature_severity Major, tag c2, updated_at 2025_12_11, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)