ET MALWARE Covenant Framework HTTP Hello World Server Response

Query · suricata

flow:established,to_client;
file_data;
content:"Hello World! eyJHVUlEIjoi"; fast_pattern;
threshold:type limit, count 1, seconds 60, track by_dst;
Raw source ET MALWARE Covenant Framework HTTP Hello World Server Response · 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 http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Covenant Framework HTTP Hello World Server Response";
    flow:established,to_client;
    file_data;
    content:"Hello World! eyJHVUlEIjoi"; fast_pattern;
    threshold:type limit, count 1, seconds 60, track by_dst;
    reference:url,posts.specterops.io/entering-a-covenant-net-command-and-control-e11038bcf462;
    classtype:trojan-activity;
    sid:2027794; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_08_04, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_04;
)

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