ET MALWARE Possible APT 41 Fake Server Response

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
http.server;
content:"Microsoft-IIS|2f 20|10.0|20|Microsoft-HTTPAPI/2.0"; fast_pattern;
Raw source ET MALWARE Possible APT 41 Fake Server Response · Suricata
Esc
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 Possible APT 41 Fake Server Response";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    http.server;
    content:"Microsoft-IIS|2f 20|10.0|20|Microsoft-HTTPAPI/2.0"; fast_pattern;
    reference:url,www.welivesecurity.com/wp-content/uploads/2019/10/ESET_Winnti.pdf;
    classtype:command-and-control;
    sid:2028837; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2019_10_16, deployment Perimeter, malware_family LOWKEY, performance_impact Low, confidence Medium, signature_severity Major, tag APT41, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_16;
)

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