ET MALWARE Winter Vivern Retrieving Commands

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/../users/"; fast_pattern; startswith;
content:".php";
http.user_agent;
content:"|3b 20|ms-office|3b 20|";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Winter Vivern Retrieving Commands · 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 Winter Vivern Retrieving Commands";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/../users/"; fast_pattern; startswith;
    content:".php";
    http.user_agent;
    content:"|3b 20|ms-office|3b 20|";
    http.header_names;
    content:!"Referer";
    reference:url,www.domaintools.com/resources/blog/winter-vivern-a-look-at-re-crafted-government-maldocs;
    reference:url,lab52.io/blog/winter-vivern-all-summer/;
    reference:md5,7940c343ae91e7198acf83400b25252f;
    classtype:trojan-activity;
    sid:2034115; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_10_05, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_15, reviewed_at 2023_08_22;
)

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