ET MALWARE [401TRG] Malicious SSL Cert (Dreambot CnC)

Query · suricata

flow:from_server,established;
tls.cert_subject;
content:"CN=motylino.xyz"; nocase; fast_pattern; endswith;
tls.cert_issuer;
content:"C=US, O=Let|27|s Encrypt, CN=Let|27|s Encrypt Authority X3";
Raw source ET MALWARE [401TRG] Malicious SSL Cert (Dreambot 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 [401TRG] Malicious SSL Cert (Dreambot CnC)";
    flow:from_server,established;
    tls.cert_subject;
    content:"CN=motylino.xyz"; nocase; fast_pattern; endswith;
    tls.cert_issuer;
    content:"C=US, O=Let|27|s Encrypt, CN=Let|27|s Encrypt Authority X3";
    reference:md5,74487b631e5688ad6affdd23340563bd;
    reference:url,twitter.com/w3ndige/status/1199375393297448961;
    classtype:domain-c2;
    sid:2029130; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2019_12_12, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_24, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

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