ET INFO Possible Microsoft OMI Agent Default TLS Certificate Observed

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"cloudapp.net";
tls.cert_issuer;
content:".cloudapp.net";
Raw source ET INFO Possible Microsoft OMI Agent Default 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 any [5986,5985,1270] -> any any (
    msg:"ET INFO Possible Microsoft OMI Agent Default TLS Certificate Observed";
    flow:established,to_client;
    tls.cert_subject;
    content:"cloudapp.net";
    tls.cert_issuer;
    content:".cloudapp.net";
    reference:url,attackerkb.com/topics/08O94gYdF1/cve-2021-38647;
    reference:url,msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38647;
    reference:url,www.wiz.io/blog/secret-agent-exposes-azure-customers-to-unauthorized-code-execution;
    classtype:bad-unknown;
    sid:2033955; rev:2;
    metadata:attack_target Server, created_at 2021_09_15, cve CVE_2021_38647, deployment Perimeter, deployment Internet, confidence Medium, signature_severity Informational, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_15;
)

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