ET MALWARE Win32/Nitol.A Checkin

alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Nitol.A Checkin";
    flow:from_client,established;
    dsize:1028;
    content:"|01 00 00 00|"; depth:4;
    content:!"|00|"; within:1;
    content:"|00|"; distance:1; within:1;
    content:"|00|"; distance:61; within:1;
    content:"|00 00 00 00 00|Windows|20|"; fast_pattern; distance:0;
    content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; distance:0;
    content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; distance:12; within:20;
    classtype:command-and-control;
    sid:2014600; rev:7;
    metadata:created_at 2012_04_17, malware_family Win32_Nitol_A, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_19;
)