ET POLICY Observed External IP Lookup SSL Cert

Query · suricata

flow:from_server,established;
tls.cert_subject;
content:".iplocation.com"; nocase; fast_pattern;
tls.cert_issuer;
content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3";
Raw source ET POLICY Observed External IP Lookup SSL Cert · 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 POLICY Observed External IP Lookup SSL Cert";
    flow:from_server,established;
    tls.cert_subject;
    content:".iplocation.com"; nocase; fast_pattern;
    tls.cert_issuer;
    content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3";
    classtype:external-ip-check;
    sid:2026882; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2019_02_05, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag IP_address_lookup_website, updated_at 2024_09_19, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1614, mitre_technique_name System_Location_Discovery;
)

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