defense_evasion_dns_over_https_enabled.toml

[metadata]
creation_date = "2021/07/22"
maturity = "production"
updated_date = "2022/03/31"

[rule]
author = ["Austin Songer"]
description = """
Identifies when a user enables DNS-over-HTTPS. This can be used to hide internet activity or the process of exfiltrating
data. With this enabled, an organization will lose visibility into data such as query type, response, and originating
IP, which are used to determine bad actors.
"""
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "DNS-over-HTTPS Enabled via Registry"
note = """## Config

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
"""
references = [
    "https://www.tenforums.com/tutorials/151318-how-enable-disable-dns-over-https-doh-microsoft-edge.html",
    "https://chromeenterprise.google/policies/?policy=DnsOverHttpsMode",
]
risk_score = 21
rule_id = "a22a09c2-2162-4df0-a356-9aacbeb56a04"
severity = "low"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
registry where event.type in ("creation", "change") and
  (registry.path : "*\\SOFTWARE\\Policies\\Microsoft\\Edge\\BuiltInDnsClientEnabled" and
  registry.data.strings : "1") or
  (registry.path : "*\\SOFTWARE\\Google\\Chrome\\DnsOverHttpsMode" and
  registry.data.strings : "secure") or
  (registry.path : "*\\SOFTWARE\\Policies\\Mozilla\\Firefox\\DNSOverHTTPS" and
  registry.data.strings : "1")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1562"
name = "Impair Defenses"
reference = "https://attack.mitre.org/techniques/T1562/"


[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"