ET MALWARE Observed Emotet Maldoc Retrieving Payload (2023-03-07) M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Observed Emotet Maldoc Retrieving Payload (2023-03-07) M1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:<60;
    content:"/"; startswith;
    content:"/?0"; fast_pattern; within:50;
    pcre:"/\/\?0[0-9]{5}(?:&c=\d{1,2})?$/";
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    http.accept; bsize:3;
    content:"|2a 2f 2a|";
    classtype:trojan-activity;
    sid:2044502; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2023_03_07, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_09;
)