ET MALWARE Covenant .NET Framework SSL/TLS Certificate Observed

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"CN=Covenant"; fast_pattern;
tls.cert_issuer;
content:"CN=Covenant";
Raw source ET MALWARE Covenant .NET Framework SSL/TLS Certificate Observed · Suricata
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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 Covenant .NET Framework SSL/TLS Certificate Observed";
    flow:established,to_client;
    tls.cert_subject;
    content:"CN=Covenant"; fast_pattern;
    tls.cert_issuer;
    content:"CN=Covenant";
    reference:url,github.com/cobbr/Covenant;
    reference:url,github.com/cobbr/Covenant/blob/5decc3ccfab04e6e881ed00c9de649740dac8ad1/Covenant/Covenant.cs#L202;
    classtype:domain-c2;
    sid:2054619; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2024_07_19, deployment Perimeter, former_category ATTACK_RESPONSE, malware_family Covenant, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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