DNS Global Query Block List Modified or Disabled

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DNS Global Query Block List Modified or Disabled

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Identifies changes to the DNS Global Query Block List (GQBL), a security feature that prevents the resolution of certain DNS names often exploited in attacks like WPAD spoofing. Attackers with certain privileges, such as DNSAdmins, can modify or disable the GQBL, allowing exploitation of hosts running WPAD with default settings for privilege escalation and lateral movement.

Rule type: eql

Rule indices:

  • logs-endpoint.events.registry-*
  • logs-windows.sysmon_operational-*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Defense Evasion
  • Data Source: Elastic Defend
  • Data Source: Sysmon

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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registry where host.os.type == "windows" and event.type : "change" and
(
  (registry.value : "EnableGlobalQueryBlockList" and registry.data.strings : ("0", "0x00000000")) or
  (registry.value : "GlobalQueryBlockList" and not registry.data.strings : "wpad")
)

Framework: MITRE ATT&CKTM