ET MALWARE Malicious SSL certificate detected (Possible Sinkhole)

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"O=infosec.jp"; fast_pattern;
content:"CN=www.infosec.jp";
content:"snowyowl@jpnsec.com"; distance:0;
Raw source ET MALWARE Malicious SSL certificate detected (Possible Sinkhole) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Malicious SSL certificate detected (Possible Sinkhole)";
    flow:established,to_client;
    tls.cert_subject;
    content:"O=infosec.jp"; fast_pattern;
    content:"CN=www.infosec.jp";
    content:"snowyowl@jpnsec.com"; distance:0;
    reference:md5,ef5fa2378307338d4e75dece88158d77;
    classtype:domain-c2;
    sid:2022323; rev:3;
    metadata:attack_target Client_and_Server, created_at 2016_01_01, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_24, reviewed_at 2024_04_16, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;
)

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