ET MALWARE GCleaner Loader CnC Checkin (/update)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE GCleaner Loader CnC Checkin (/update)";
    flow:established,to_server;
    urilen:7;
    http.method;
    content:"GET";
    http.uri;
    content:"/update"; fast_pattern;
    http.accept; bsize:117;
    content:"text|2f|html|2c 20|application|2f|xml|3b|q|3d|0|2e|9|2c 20|application|2f|xhtml|2b|xml|2c 20|image|2f|png|2c 20|image|2f|jpeg|2c 20|image|2f|gif|2c 20|image|2f|x|2d|xbitmap|2c 20 2a 2f 2a 3b|q|3d|0|2e|1";
    http.accept_lang;
    content:"ru-RU"; startswith;
    http.user_agent; bsize:1;
    pcre:"/^.$/";
    reference:md5,e627cad277450feb0685a9b2abd981f8;
    reference:md5,9c44f98f428e7a562553944c3067f73b;
    classtype:trojan-activity;
    sid:2064241; 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_09_02, deployment Perimeter, malware_family GCleaner, performance_impact Moderate, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)