ET MALWARE Suspected TA451 Related FalseFont Backdoor Activity M2

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/realtime/negotiate?negotiateVersion="; startswith; fast_pattern;
content:!"|2e|";
threshold:type limit, count 1, seconds 300, track by_src;
target:src_ip;
Raw source ET MALWARE Suspected TA451 Related FalseFont Backdoor Activity M2 · Suricata
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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 TA451 Related FalseFont Backdoor Activity M2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/realtime/negotiate?negotiateVersion="; startswith; fast_pattern;
    content:!"|2e|";
    threshold:type limit, count 1, seconds 300, track by_src;
    reference:md5,5b759c6db78de7587a9d201e8ea28c03;
    reference:md5,6fd5d31d607a212c6f7651c79e7655a3;
    reference:url,twitter.com/MsftSecIntel/status/1737895717870440609;
    classtype:trojan-activity;
    sid:2049948; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2024_01_09, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_05, reviewed_at 2024_04_05;
    target:src_ip;
)

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