ET MALWARE Stealbit Variant Data Exfil M1

alert http $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (
    msg:"ET MALWARE Stealbit Variant Data Exfil M1";
    flow:to_server,established;
    http.method;
    content:"POST";
    http.uri;
    content:!".html";
    http.request_body;
    content:"&filesize=";
    content:"&framesize="; fast_pattern;
    content:"&framenum=";
    content:"&filecrc=";
    content:"&filename=";
    content:"&pcname=";
    reference:md5,f05af511670dba679d845e3d477e789d;
    reference:url,twitter.com/James_inthe_box/status/1425921372987944961;
    reference:url,blog.reversinglabs.com/blog/data-exfiltrator;
    classtype:command-and-control;
    sid:2033727; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_30;
)