ET MALWARE Lemon_Duck Powershell CnC Checkin M6

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Lemon_Duck Powershell CnC Checkin M6";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".jsp?&"; fast_pattern;
    content:"&"; distance:0;
    content:"-"; distance:0;
    content:"&"; distance:0;
    content:"|3a|"; distance:2; within:1;
    content:"&"; distance:0;
    content:"&"; distance:0;
    content:"&"; distance:0;
    content:"&"; distance:0;
    content:"&"; distance:0;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|";
    content:!"User-Agent";
    content:!"Accept";
    content:!"Referer";
    reference:md5,293b4a6f18fdf5146b92e87e51cf8aa1;
    classtype:command-and-control;
    sid:2033020; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_05_24, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_24;
)