ET MALWARE Possible Kimsuky Related Malicious VBScript

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Possible Kimsuky Related Malicious VBScript";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.header;
    content:"Content-Encoding|3a 20|gzip";
    http.response_body;
    content:"language|3d|javascript|3e|document|2e|write|28|unescape|28 27|";
    content:"%47%65%74%4F%62%6A%65%63%74%28%22%22%6E%65%77%3A";
    content:"%2E%76%62%73%20%26%40%65%63%68%6F%20%55%52%4C%20%3D%20%22%22"; distance:0; within:285; fast_pattern;
    content:"%73%65%6C%66%2E%63%6C%6F%73%65";
    reference:md5,d74f268b986fecfa03b81029dd134811;
    classtype:trojan-activity;
    sid:2034697; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_13, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_18;
)