DNS-over-HTTPS Enabled via Registry

 1[metadata]
 2creation_date = "2021/07/22"
 3integration = ["endpoint", "windows", "m365_defender", "sentinel_one_cloud_funnel"]
 4maturity = "production"
 5updated_date = "2024/10/15"
 6min_stack_version = "8.14.0"
 7min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
 8
 9[rule]
10author = ["Austin Songer"]
11description = """
12Identifies when a user enables DNS-over-HTTPS. This can be used to hide internet activity or the process of exfiltrating
13data. With this enabled, an organization will lose visibility into data such as query type, response, and originating
14IP, which are used to determine bad actors.
15"""
16from = "now-9m"
17index = ["winlogbeat-*", "logs-endpoint.events.registry-*", "logs-windows.sysmon_operational-*", "endgame-*", "logs-m365_defender.event-*", "logs-sentinel_one_cloud_funnel.*"]
18language = "eql"
19license = "Elastic License v2"
20name = "DNS-over-HTTPS Enabled via Registry"
21references = [
22    "https://www.tenforums.com/tutorials/151318-how-enable-disable-dns-over-https-doh-microsoft-edge.html",
23    "https://chromeenterprise.google/policies/?policy=DnsOverHttpsMode",
24]
25risk_score = 21
26rule_id = "a22a09c2-2162-4df0-a356-9aacbeb56a04"
27severity = "low"
28tags = [
29    "Domain: Endpoint",
30    "OS: Windows",
31    "Use Case: Threat Detection",
32    "Tactic: Defense Evasion",
33    "Data Source: Elastic Endgame",
34    "Data Source: Elastic Defend",
35    "Data Source: Sysmon",
36    "Data Source: Microsoft Defender for Endpoint",
37    "Data Source: SentinelOne",
38]
39timestamp_override = "event.ingested"
40type = "eql"
41
42query = '''
43registry where host.os.type == "windows" and event.type == "change" and
44  (registry.path : "*\\SOFTWARE\\Policies\\Microsoft\\Edge\\BuiltInDnsClientEnabled" and
45  registry.data.strings : ("1", "0x00000001")) or
46  (registry.path : "*\\SOFTWARE\\Google\\Chrome\\DnsOverHttpsMode" and
47  registry.data.strings : "secure") or
48  (registry.path : "*\\SOFTWARE\\Policies\\Mozilla\\Firefox\\DNSOverHTTPS" and
49  registry.data.strings : ("1", "0x00000001"))
50'''
51
52
53[[rule.threat]]
54framework = "MITRE ATT&CK"
55[[rule.threat.technique]]
56id = "T1112"
57name = "Modify Registry"
58reference = "https://attack.mitre.org/techniques/T1112/"
59
60[[rule.threat.technique]]
61id = "T1562"
62name = "Impair Defenses"
63reference = "https://attack.mitre.org/techniques/T1562/"
64
65
66[rule.threat.tactic]
67id = "TA0005"
68name = "Defense Evasion"
69reference = "https://attack.mitre.org/tactics/TA0005/"