UAC Bypass Using Event Viewer RecentViews

Hunt Hypothesis

Detects the pattern of UAC Bypass using Event Viewer RecentViews

Detection Rule

Sigma (Original)

title: UAC Bypass Using Event Viewer RecentViews
id: 30fc8de7-d833-40c4-96b6-28319fbc4f6c
related:
    - id: 63e4f530-65dc-49cc-8f80-ccfa95c69d43
      type: similar
status: test
description: Detects the pattern of UAC Bypass using Event Viewer RecentViews
references:
    - https://twitter.com/orange_8361/status/1518970259868626944
    - https://lolbas-project.github.io/lolbas/Binaries/Eventvwr/#execute
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-11-22
tags:
    - attack.privilege-escalation
    - attack.stealth
logsource:
    category: process_creation
    product: windows
detection:
    selection_path:
        # Example: ysoserial.exe -o raw -f BinaryFormatter - g DataSet -c calc > RecentViews & copy RecentViews %LOCALAPPDATA%\Microsoft\EventV~1\RecentViews & eventvwr.exe
        CommandLine|contains:
            - '\Event Viewer\RecentViews'
            - '\EventV~1\RecentViews'
    selection_redirect:
        CommandLine|contains: '>'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imProcessCreate
| where (TargetProcessCommandLine contains "\\Event Viewer\\RecentViews" or TargetProcessCommandLine contains "\\EventV~1\\RecentViews") and TargetProcessCommandLine contains ">"

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Tactic: Privilege Escalation

References

• https://twitter.com/orange_8361/status/1518970259868626944
• https://lolbas-project.github.io/lolbas/Binaries/Eventvwr/#execute
• SigmaHQ Rule