ET MALWARE Possible APT28 DOC Uploader SSL/TLS Certificate Observed

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"CN=mvtband.net";
tls.cert_issuer;
content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3";
tls.cert_serial;
content:"03:04:FF:5D:C9:BB:AC:50:C1:7B:3E:4C:1C:68:26:15:F0:3E";
Raw source ET MALWARE Possible APT28 DOC Uploader 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 Possible APT28 DOC Uploader SSL/TLS Certificate Observed";
    flow:established,to_client;
    tls.cert_subject;
    content:"CN=mvtband.net";
    tls.cert_issuer;
    content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3";
    tls.cert_serial;
    content:"03:04:FF:5D:C9:BB:AC:50:C1:7B:3E:4C:1C:68:26:15:F0:3E";
    reference:md5,9b10685b774a783eabfecdb6119a8aa3;
    classtype:targeted-activity;
    sid:2026539; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_24, deployment Perimeter, confidence High, signature_severity Major, tag APT28, updated_at 2020_08_27;
)

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