ET MALWARE Observed Malicious FIN12 Related SSL Cert

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"OU=Delegated Licensor,KYP SDT LTD"; fast_pattern;
pcre:"/CN=(?:[^\r\n]+?\.)?OU=Delegated\ Licensor,KYP\ SDT\ LTD(?!\.)/";
Raw source ET MALWARE Observed Malicious FIN12 Related SSL Cert · 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 Observed Malicious FIN12 Related SSL Cert";
    flow:established,to_client;
    tls.cert_subject;
    content:"OU=Delegated Licensor,KYP SDT LTD"; fast_pattern;
    pcre:"/CN=(?:[^\r\n]+?\.)?OU=Delegated\ Licensor,KYP\ SDT\ LTD(?!\.)/";
    reference:url,www.mandiant.com/resources/fin12-ransomware-intrusion-actor-pursuing-healthcare-targets;
    classtype:trojan-activity;
    sid:2034177; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_10_12, deployment Perimeter, malware_family Fin12, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_12;
)

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