ET MALWARE SSL/TLS Certificate Observed (Link Implant Default)

Query · suricata

flow:established,to_client;
tls.cert_serial;
content:"4D:5B:93:D5:0F:D5:2F:C2:9C:9F:66:4B:62:64:DC:52:D6:E0:B7:D5";
Raw source ET MALWARE SSL/TLS Certificate Observed (Link Implant Default) · 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 SSL/TLS Certificate Observed (Link Implant Default)";
    flow:established,to_client;
    tls.cert_serial;
    content:"4D:5B:93:D5:0F:D5:2F:C2:9C:9F:66:4B:62:64:DC:52:D6:E0:B7:D5";
    reference:url,github.com/postrequest/link;
    classtype:domain-c2;
    sid:2037929; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_08_04, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_04;
)

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