ET HUNTING WebDAV Retrieving .dll

Query · suricata

flow:established,to_server;
http.method;
content:"PROPFIND";
http.uri;
content:".dll"; endswith;
http.user_agent;
content:"Microsoft-WebDAV-MiniRedir/"; startswith; fast_pattern;
http.header_names;
content:!"Referer";
target:src_ip;
Raw source ET HUNTING WebDAV Retrieving .dll · 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 Retrieving .dll";
    flow:established,to_server;
    http.method;
    content:"PROPFIND";
    http.uri;
    content:".dll"; endswith;
    http.user_agent;
    content:"Microsoft-WebDAV-MiniRedir/"; startswith; fast_pattern;
    http.header_names;
    content:!"Referer";
    classtype:bad-unknown;
    sid:2047743; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_08_25, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_25, reviewed_at 2023_08_25;
    target:src_ip;
)

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