ET MALWARE W32.Netwire Connectivity Check

Query · suricata

flow:to_server,established;
urilen:1;
http.method;
content:"GET";
http.user_agent;
content:"Mozilla/4.0 (Windows NT 6.1|3b| WOW64|3b| Trident/7.0|3b| rv|3a|11.0) like Gecko"; endswith;
http.host;
content:"checkip.dyndns.org"; endswith; fast_pattern;
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE W32.Netwire Connectivity 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 W32.Netwire Connectivity Check";
    flow:to_server,established;
    urilen:1;
    http.method;
    content:"GET";
    http.user_agent;
    content:"Mozilla/4.0 (Windows NT 6.1|3b| WOW64|3b| Trident/7.0|3b| rv|3a|11.0) like Gecko"; endswith;
    http.host;
    content:"checkip.dyndns.org"; endswith; fast_pattern;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:url,malpedia.caad.fkie.fraunhofer.de/details/win.netwire;
    classtype:trojan-activity;
    sid:2034089; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_10_01, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_01, reviewed_at 2023_08_22;
)

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