ET MALWARE TA399/Sidewinder Maldoc Activity

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/file.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 Maldoc Activity · 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 Maldoc Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/file.rtf"; endswith; fast_pattern;
    http.user_agent;
    content:"|3b 20|ms-office|3b 20|";
    http.header_names;
    content:!"Referer";
    reference:md5,e096b33467e6018944c05fb6e4bb03a0;
    reference:url,twitter.com/ShadowChasing1/status/1466001768765018116;
    classtype:trojan-activity;
    sid:2034569; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_12_01, deployment Perimeter, deployment SSLDecrypt, malware_family Sidewinder, performance_impact Low, confidence High, signature_severity Major, tag TA399, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_13, reviewed_at 2023_08_22;
)

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