ET MALWARE [Mandiant] UNC4841 SEASPY Backdoor Activity M2

Query · suricata

flow:stateless,to_server;
flags:S;
dsize:>9;
content:"TfuZ"; startswith;
threshold:type limit,track by_src,count 1,seconds 3600;
target:dest_ip;
Raw source ET MALWARE [Mandiant] UNC4841 SEASPY Backdoor 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 tcp-pkt any any -> $SMTP_SERVERS [25,587] (
    msg:"ET MALWARE [Mandiant] UNC4841 SEASPY Backdoor Activity M2";
    flow:stateless,to_server;
    flags:S;
    dsize:>9;
    content:"TfuZ"; startswith;
    threshold:type limit,track by_src,count 1,seconds 3600;
    reference:url,www.mandiant.com/resources/blog/barracuda-esg-exploited-globally;
    classtype:command-and-control;
    sid:2046274; rev:1;
    metadata:affected_product Barracuda_ESG, attack_target SMTP_Server, created_at 2023_06_15, deployment Perimeter, deployment Internal, malware_family SEASPY, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_06_21, reviewed_at 2023_08_21;
    target:dest_ip;
)

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