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IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
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Elastic Docs ›Elastic Security Solution [8.10] ›Downloadable rule update v8.10.14

UAC Bypass Attempt via Privileged IFileOperation COM Interface

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UAC Bypass Attempt via Privileged IFileOperation COM Interface

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Identifies attempts to bypass User Account Control (UAC) via DLL side-loading. Attackers may attempt to bypass UAC to stealthily execute code with elevated permissions.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.*
  • logs-windows.sysmon_operational-*
  • endgame-*

Severity: high

Risk score: 73

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: Privilege Escalation
  • Tactic: Defense Evasion
  • Data Source: Elastic Endgame
  • Data Source: Elastic Defend
  • Data Source: Sysmon

Version: 108

Rule authors:

  • Elastic

Rule license: Elastic License v2

Setup

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Setup

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 version 8.2. Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate event.ingested to @timestamp. For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html

Rule query

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file where host.os.type == "windows" and event.type : "change" and process.name : "dllhost.exe" and
  /* Known modules names side loaded into process running with high or system integrity level for UAC Bypass, update here for new modules */
  file.name : ("wow64log.dll", "comctl32.dll", "DismCore.dll", "OskSupport.dll", "duser.dll", "Accessibility.ni.dll") and
  /* has no impact on rule logic just to avoid OS install related FPs */
  not file.path : ("C:\\Windows\\SoftwareDistribution\\*", "C:\\Windows\\WinSxS\\*")

Framework: MITRE ATT&CKTM

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