UAC Bypass via Event Viewer

Hunt Hypothesis

Detects UAC bypass method using Windows event viewer

Detection Rule

Sigma (Original)

title: UAC Bypass via Event Viewer
id: 7c81fec3-1c1d-43b0-996a-46753041b1b6
status: test
description: Detects UAC bypass method using Windows event viewer
references:
    - https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/
    - https://www.hybrid-analysis.com/sample/e122bc8bf291f15cab182a5d2d27b8db1e7019e4e96bb5cdbd1dfe7446f3f51f?environmentId=100
author: Florian Roth (Nextron Systems)
date: 2017-03-19
modified: 2023-09-28
tags:
    - attack.privilege-escalation
    - attack.t1548.002
    - car.2019-04-001
logsource:
    product: windows
    category: registry_set
detection:
    selection:
        TargetObject|endswith: '\mscfile\shell\open\command'
    condition: selection
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imRegistry
| where RegistryKey endswith "\\mscfile\\shell\\open\\command"

KQL (Microsoft 365 Defender)

DeviceRegistryEvents
| where RegistryKey endswith "\\mscfile\\shell\\open\\command"

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Tactic: Privilege Escalation
• Technique: T1548.002 — T1548.002

References

• https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/
• https://www.hybrid-analysis.com/sample/e122bc8bf291f15cab182a5d2d27b8db1e7019e4e96bb5cdbd1dfe7446f3f51f?environmentId=100
• SigmaHQ Rule