ET MALWARE Buer Loader Download Request

Query · suricata

flow:established,to_server;
urilen:>200;
flowbits:set,ETPRO.wacatac.b.download;
http.method;
content:"GET";
http.uri;
content:"/api/download/"; depth:14; fast_pattern;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
http.header_names;
content:!"Accept";
content:!"Referer";

Rule dependencies

Feeds into

  • 1 rule read ETPRO.wacatac.b.download · view all
Raw source ET MALWARE Buer Loader Download 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Buer Loader Download Request";
    flow:established,to_server;
    urilen:>200;
    flowbits:set,ETPRO.wacatac.b.download;
    http.method;
    content:"GET";
    http.uri;
    content:"/api/download/"; depth:14; fast_pattern;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
    http.header_names;
    content:!"Accept";
    content:!"Referer";
    reference:md5,a8819db1fa758fd9f1d501dbb50f454f;
    classtype:command-and-control;
    sid:2029078; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_12, deployment Perimeter, malware_family BuerLoader, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_02_11;
)

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