ET MALWARE UsefulTyphon CnC Activity M2

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".down"; fast_pattern;
pcre:"/\/[a-f0-9]{16}\.down$/";
http.header_names;
content:!"Referer";
Raw source ET MALWARE UsefulTyphon CnC Activity M2 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE UsefulTyphon CnC Activity M2";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".down"; fast_pattern;
    pcre:"/\/[a-f0-9]{16}\.down$/";
    http.header_names;
    content:!"Referer";
    reference:md5,768c84100d6e3181a26fa50261129287;
    classtype:command-and-control;
    sid:2036503; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_10_06, deployment Perimeter, malware_family Kimsuky, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_06;
)

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