ET MALWARE CloudAtlas APT Related Maldoc Activity M1 (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/?"; startswith;
content:".html_"; fast_pattern; within:15;
http.user_agent;
content:"|3b 20|ms-office|3b 20|";
http.header_names;
content:!"Referer";
target:src_ip;
Raw source ET MALWARE CloudAtlas APT Related Maldoc Activity M1 (GET) · 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 CloudAtlas APT Related Maldoc Activity M1 (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/?"; startswith;
    content:".html_"; fast_pattern; within:15;
    http.user_agent;
    content:"|3b 20|ms-office|3b 20|";
    http.header_names;
    content:!"Referer";
    reference:md5,7bdb049cb0cc3623e4fa1d8e2574f1ce;
    reference:md5,2e950fe4bd76088f89433a6f2146cb67;
    reference:url,www.facct.ru/blog/cloud-atlas;
    classtype:trojan-activity;
    sid:2049730; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_12_19, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_19;
    target:src_ip;
)

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