ET MALWARE TA399/Sidewinder Activity Payload Request M2, Microsoft Office UA Request for .rtf

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".rtf"; endswith; fast_pattern;
http.user_agent;
content:"|3b 20|ms-office|3b 20|";
http.header_names;
content:!"Referer";
Raw source ET MALWARE TA399/Sidewinder Activity Payload Request M2, Microsoft Office UA Request for .rtf · 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 TA399/Sidewinder Activity Payload Request M2, Microsoft Office UA Request for .rtf";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".rtf"; endswith; fast_pattern;
    http.user_agent;
    content:"|3b 20|ms-office|3b 20|";
    http.header_names;
    content:!"Referer";
    reference:url,twitter.com/ShadowChasing1/status/1433038639961804800;
    reference:md5,c9f8addb927c3b96aee6a9f671a1f801;
    classtype:command-and-control;
    sid:2033858; rev:4;
    metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2021_09_01, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag TA399, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_26, reviewed_at 2023_08_22;
)

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