ET MALWARE Possible STEADYPULSE Webshell Accessed M2

alert http [$HOME_NET,$HTTP_SERVERS] any -> any any (
    msg:"ET MALWARE Possible STEADYPULSE Webshell Accessed M2";
    flow:from_server,established;
    http.stat_code;
    content:"200";
    file.data;
    content:"|0d 0a|Results of|20 27|";
    content:"'|27 20|execution|3a 0a 0a|"; distance:1; within:256; fast_pattern;
    reference:url,www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html;
    classtype:attempted-user;
    sid:2032800; rev:1;
    metadata:created_at 2021_04_21, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_21;
)