ET MALWARE Win32/Blacknix CnC Heartbeat

Query · suricata

flow:to_server,established;
dsize:15;
content:"|7c 78 01|"; offset:2; depth:3;
pcre:"/^[0-9]{2}\x7cx/";
threshold:type both, track by_src, count 5, seconds 60;
Raw source ET MALWARE Win32/Blacknix CnC Heartbeat · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Blacknix CnC Heartbeat";
    flow:to_server,established;
    dsize:15;
    content:"|7c 78 01|"; offset:2; depth:3;
    pcre:"/^[0-9]{2}\x7cx/";
    threshold:type both, track by_src, count 5, seconds 60;
    reference:md5,b4e95d3ec39cf8c7347ca1c64cfed631;
    classtype:command-and-control;
    sid:2027732; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_07_19, deployment Perimeter, malware_family Win32_Blacknix, confidence High, signature_severity Major, tag Blacknix, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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