ET MALWARE Buer Loader Update Request

Query · suricata

flow:established,to_server;
urilen:>200;
http.method;
content:"GET";
http.uri;
content:"/api/update/"; depth:12;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
http.user_agent;
content:"Mozilla/5.0 (Apple-iPhone7C2/1202.466|3b 20|U|3b 20|CPU like Mac OS X|3b 20|";
http.header_names;
content:!"Accept";
content:!"Referer";
Raw source ET MALWARE Buer Loader Update Request · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Buer Loader Update Request";
    flow:established,to_server;
    urilen:>200;
    http.method;
    content:"GET";
    http.uri;
    content:"/api/update/"; depth:12;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
    http.user_agent;
    content:"Mozilla/5.0 (Apple-iPhone7C2/1202.466|3b 20|U|3b 20|CPU like Mac OS X|3b 20|";
    http.header_names;
    content:!"Accept";
    content:!"Referer";
    reference:md5,8a47ed652ce8c2dee39c8fa8fcb3fa9d;
    classtype:command-and-control;
    sid:2029768; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_31, deployment Perimeter, malware_family BuerLoader, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_03_31;
)

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