ET MALWARE Base64 Encoded Stealer Config from Server - APPDATA or USERPROFILE Environment Variable M1

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Base64 Encoded Stealer Config from Server - APPDATA or USERPROFILE Environment Variable M1";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.response_body;
    content:"MHwwf"; startswith; fast_pattern;
    content:"f"; distance:7; within:1;
    base64_decode:bytes 250;
    base64_data;
    pcre:"/%(?:USERPROFILE|APPDATA)%/i";
    reference:url,blog.malwarebytes.com/threat-intelligence/2022/04/colibri-loader-combines-task-scheduler-and-powershell-in-clever-persistence-technique;
    reference:md5,bb41fbddc48fc3548d55a6ad9c321832;
    reference:md5,1cde32d54a0f0f2ddad79d7df6a7419f;
    classtype:command-and-control;
    sid:2035881; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_08, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2022_04_21;
)