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.*

Severity: high

Risk score: 73

Runs every: 5 minutes

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

Maximum alerts per execution: 100

References:

https://github.com/hfiref0x/UACME

Tags:

Elastic
Host
Windows
Threat Detection
Privilege Escalation

Version: 4 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 7.15.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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file where 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\\*")

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Abuse Elevation Control Mechanism
- ID: T1548
- Reference URL: https://attack.mitre.org/techniques/T1548/

Rule version history

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Version 4 (7.15.0 release)

Formatting only

Version 3 (7.12.0 release)

Formatting only

Version 2 (7.11.2 release)

Formatting only

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