ET HUNTING Terse Request to note .youdao .com - Possible Download

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/yws/api/personal/file/";
content:"?method=download&shareKey="; distance:0;
pcre:"/[a-f0-9]{32}$/UR";
http.host;
content:"note.youdao.com"; fast_pattern; bsize:15;
http.header_names;
content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:22;
content:!"Referer";
Raw source ET HUNTING Terse Request to note .youdao .com - Possible Download · 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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING Terse Request to note .youdao .com - Possible Download";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/yws/api/personal/file/";
    content:"?method=download&shareKey="; distance:0;
    pcre:"/[a-f0-9]{32}$/UR";
    http.host;
    content:"note.youdao.com"; fast_pattern; bsize:15;
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:22;
    content:!"Referer";
    reference:url,twitter.com/malwrhunterteam/status/1509160261881667585;
    classtype:misc-activity;
    sid:2035681; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_03_30, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_31, reviewed_at 2025_04_17;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.