ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response M2

alert tcp $EXTERNAL_NET ![443,80] -> $HOME_NET any (
    msg:"ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response M2";
    flow:established,to_client;
    dsize:<48;
    content:"|00 00 00 3c|"; startswith; fast_pattern;
    content:"|01|"; distance:1; within:1;
    content:"|20|"; distance:4; within:1;
    pcre:"/^[\x01-\x04]/R";
    reference:md5,b3be367b4868d39d6978d27f4d4dfaaf;
    reference:url,www.fortinet.com/blog/threat-research/mirai-based-botnet-moobot-targets-hikvision-vulnerability;
    reference:url,blog.netlab.360.com/ddos-botnet-moobot-en/;
    classtype:command-and-control;
    sid:2034640; rev:2;
    metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2021_12_09, deployment Perimeter, malware_family ELF_MooBot, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_09;
)