ET MALWARE JasperLoader CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE JasperLoader CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"?b=";
    content:"&v="; distance:0;
    content:"&psver="; distance:0; fast_pattern;
    isdataat:!2,relative;
    http.connection;
    content:"Keep-Alive"; depth:10; endswith;
    http.header_names;
    content:!"Referer";
    content:!"User-Agent";
    content:!"Cache";
    content:!"Accept";
    classtype:command-and-control;
    sid:2027100; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2019_03_19, deployment Perimeter, malware_family JasperLoader, performance_impact Low, confidence High, signature_severity Major, tag Downloader, tag JavaScript, updated_at 2020_09_17;
)