ET MALWARE ABUSE.CH SSL Fingerprint Blacklist Malicious SSL Certificate Detected (Malware C2)

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"CN=4b7gf8bngf877"; bsize:16; fast_pattern;
Raw source ET MALWARE ABUSE.CH SSL Fingerprint Blacklist Malicious SSL Certificate Detected (Malware C2) · 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 ABUSE.CH SSL Fingerprint Blacklist Malicious SSL Certificate Detected (Malware C2)";
    flow:established,to_client;
    tls.cert_subject;
    content:"CN=4b7gf8bngf877"; bsize:16; fast_pattern;
    reference:url,sslbl.abuse.ch;
    classtype:domain-c2;
    sid:2022919; rev:3;
    metadata:attack_target Client_and_Server, created_at 2016_06_27, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2022_03_13, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;
)

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