ET MALWARE Observed Malicious SSL Cert (BazaLoader CnC)

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"C=KZ, ST=Astana, L=Astana, O=NN Fern, OU=KZ System, CN=forenzik.kz"; bsize:66; fast_pattern;
tls.cert_issuer;
content:"C=KZ, ST=Astana, L=Astana, O=NN Fern, OU=KZ System, CN=forenzik.kz"; bsize:66;
Raw source ET MALWARE Observed Malicious SSL Cert (BazaLoader CnC) · 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 SSL Cert (BazaLoader CnC)";
    flow:established,to_client;
    tls.cert_subject;
    content:"C=KZ, ST=Astana, L=Astana, O=NN Fern, OU=KZ System, CN=forenzik.kz"; bsize:66; fast_pattern;
    tls.cert_issuer;
    content:"C=KZ, ST=Astana, L=Astana, O=NN Fern, OU=KZ System, CN=forenzik.kz"; bsize:66;
    reference:md5,4cca9a1ec4b92df89a8bc992a6ba961f;
    classtype:domain-c2;
    sid:2033034; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2021_05_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_26, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

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