ET MALWARE Malicious CobaltStrike SSL/TLS Certificate Observed

Query · suricata

flow:established,to_client;
tls.cert_serial;
content:"33:00:14:46:13:a5:f5:e2:96:09:bb:55:f2:00:00:00:14:46:13"; fast_pattern;
target:dest_ip;
Raw source ET MALWARE Malicious CobaltStrike SSL/TLS Certificate Observed · 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 CobaltStrike SSL/TLS Certificate Observed";
    flow:established,to_client;
    tls.cert_serial;
    content:"33:00:14:46:13:a5:f5:e2:96:09:bb:55:f2:00:00:00:14:46:13"; fast_pattern;
    classtype:domain-c2;
    sid:2055755; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state TLSEncrypt, created_at 2024_09_05, deployment Perimeter, malware_family CobaltStrike, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:dest_ip;
)

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