ET HUNTING WebDAV Traffic to Cloudflare Tunneling Service (.trycloudflare .com)

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Microsoft-WebDAV-MiniRedir";
http.host;
content:".trycloudflare.com"; endswith; fast_pattern;
threshold:type limit,count 1,seconds 300,track by_src;
target:src_ip;
Raw source ET HUNTING WebDAV Traffic to Cloudflare Tunneling Service (.trycloudflare .com) · 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 HUNTING WebDAV Traffic to Cloudflare Tunneling Service (.trycloudflare .com)";
    flow:established,to_server;
    http.user_agent;
    content:"Microsoft-WebDAV-MiniRedir";
    http.host;
    content:".trycloudflare.com"; endswith; fast_pattern;
    threshold:type limit,count 1,seconds 300,track by_src;
    classtype:misc-activity;
    sid:2065648; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_11_04, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1568, mitre_technique_name Dynamic_Resolution;
    target:src_ip;
)

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