ET MALWARE Suspected Chinese Based APT Malware Retrieving File (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/v1/disk/resources/download?path="; startswith;
content:"/a.psd"; endswith; fast_pattern;
http.host;
content:"cloud-api.yandex.net"; bsize:20;
http.header_names;
content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Authorization|0d 0a 0d 0a|"; bsize:33;
Raw source ET MALWARE Suspected Chinese Based APT Malware Retrieving File (GET) · 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 MALWARE Suspected Chinese Based APT Malware Retrieving File (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/v1/disk/resources/download?path="; startswith;
    content:"/a.psd"; endswith; fast_pattern;
    http.host;
    content:"cloud-api.yandex.net"; bsize:20;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Authorization|0d 0a 0d 0a|"; bsize:33;
    reference:md5,0c4540f659d3942a28f158bce7be1143;
    reference:url,www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/apt31-cloud-attacks/;
    classtype:trojan-activity;
    sid:2038751; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_09_07, deployment Perimeter, deployment SSLDecrypt, malware_family TontoTeam, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_07;
)

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