ET MALWARE Suspected Gamaredon Related Maldoc Activity M2

Query · suricata

flow:established,to_server;
http.method;
content:"OPTIONS";
http.uri;
content:"/USER-"; startswith; fast_pattern;
http.user_agent;
content:"Microsoft Office"; startswith;
http.header_names;
content:"|0d 0a|X-MSGETWEBURL|0d 0a|X-IDCRL_ACCEPTED|0d 0a|";
Raw source ET MALWARE Suspected Gamaredon Related Maldoc Activity M2 · 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 Related Maldoc Activity M2";
    flow:established,to_server;
    http.method;
    content:"OPTIONS";
    http.uri;
    content:"/USER-"; startswith; fast_pattern;
    http.user_agent;
    content:"Microsoft Office"; startswith;
    http.header_names;
    content:"|0d 0a|X-MSGETWEBURL|0d 0a|X-IDCRL_ACCEPTED|0d 0a|";
    reference:md5,fa1039ec7779e5c1431fa072e7aa85aa;
    classtype:trojan-activity;
    sid:2045808; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_05_20, deployment Perimeter, malware_family Gamaredon, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_20;
)

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