ET MALWARE Observed Malicious SSL Cert (MirrorThief CnC)

Query · suricata

flow:from_server,established;
tls.cert_subject;
content:"CN=jqueryextd.at"; nocase; endswith; fast_pattern;
tls.cert_issuer;
content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3";
Raw source ET MALWARE Observed Malicious SSL Cert (MirrorThief 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 (MirrorThief CnC)";
    flow:from_server,established;
    tls.cert_subject;
    content:"CN=jqueryextd.at"; nocase; endswith; fast_pattern;
    tls.cert_issuer;
    content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3";
    reference:url,blog.netlab.360.com/xin-yong-qia-shu-ju-xie-lou-chi-xu-jin-xing-zhong/;
    classtype:domain-c2;
    sid:2027355; rev:3;
    metadata:attack_target Client_and_Server, created_at 2019_05_15, deployment Perimeter, malware_family MirrorThief, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

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