ET MALWARE [PTsecurity] Botnet Nitol.B Checkin

alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE [PTsecurity] Botnet Nitol.B Checkin";
    flow:established,to_server,no_stream;
    dsize:<400;
    content:"|00 00 77 00 00 00|"; depth:30; fast_pattern;
    content:"MHz"; within:350;
    content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; depth:120;
    classtype:command-and-control;
    sid:2025135; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_06, deployment Perimeter, malware_family nitol, performance_impact Moderate, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_19;
)