ET MALWARE Possible SharpShooter Framework Generated VBS Script

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Possible SharpShooter Framework Generated VBS Script";
    flow:established,to_client;
    file_data;
    content:"RC4|28|byteMessage, strKey|29|"; nocase;
    content:"function decodeBase64|28|base64|29|"; nocase; distance:0;
    content:".createElement|28 22|tmp|22 29|"; nocase; distance:0;
    content:"decoded = decodeBase64|28|"; nocase; distance:0;
    reference:url,www.mdsec.co.uk/2018/03/payload-generation-using-sharpshooter/;
    reference:url,blog.morphisec.com/sharpshooter-pen-testing-framework-used-in-attacks;
    classtype:trojan-activity;
    sid:2026919; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2019_02_18, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)