ET MALWARE Fake Software Download Redirect Leading to Malware M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Fake Software Download Redirect Leading to Malware M1";
    flow:established,to_server;
    http.request_line;
    content:"GET|20|/?s="; startswith; fast_pattern;
    content:"&q="; distance:0;
    content:"&g="; distance:0;
    pcre:"/^[a-f0-9]{32}/R";
    http.header_names;
    content:!"User-Agent";
    content:!"Accept|0d 0a|";
    reference:md5,9284526d864c785b1d6bedd7830e8c19;
    reference:url,news.sophos.com/en-us/2021/09/01/fake-pirated-software-sites-serve-up-malware-droppers-as-a-service/;
    classtype:trojan-activity;
    sid:2033953; rev:1;
    metadata:created_at 2021_09_15, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_15;
)