ET MALWARE Win32/TrickBot Anchor Variant Style External IP Check

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
urilen:1;
http.user_agent;
content:"WinHTTP loader/"; fast_pattern; startswith;
http.host; bsize:21;
content:"checkip.amazonaws.com";
http.header_names;
content:!"|0d 0a|Referer|0d 0a|";
Raw source ET MALWARE Win32/TrickBot Anchor Variant Style External IP Check · 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 $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/TrickBot Anchor Variant Style External IP Check";
    flow:established,to_server;
    http.method;
    content:"GET";
    urilen:1;
    http.user_agent;
    content:"WinHTTP loader/"; fast_pattern; startswith;
    http.host; bsize:21;
    content:"checkip.amazonaws.com";
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    reference:md5,730b66cd89c8b4751dbe2c5158701a0b;
    classtype:trojan-activity;
    sid:2032216; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_11_16, deployment Perimeter, malware_family AnchorTrickBot, confidence High, signature_severity Major, updated_at 2024_03_12;
)

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