ET MALWARE Suspected Gamaredon APT Related Maldoc Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"_";
content:"/office.txt"; within:26; endswith; fast_pattern;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Suspected Gamaredon APT Related Maldoc Activity (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 Gamaredon APT Related Maldoc Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"_";
    content:"/office.txt"; within:26; endswith; fast_pattern;
    http.header_names;
    content:!"Referer";
    reference:md5,97d3d3fe312514f33a44dcd9d5887b54;
    reference:url,unit42.paloaltonetworks.com/gamaredon-primitive-bear-ukraine-update-2021/;
    classtype:trojan-activity;
    sid:2035218; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_02_18, deployment Perimeter, malware_family Gamaredon, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_18;
)

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