UAC Bypass Via Wsreset

Hunt Hypothesis

Unfixed method for UAC bypass from Windows 10. WSReset.exe file associated with the Windows Store. It will run a binary file contained in a low-privilege registry.

Detection Rule

Sigma (Original)

title: UAC Bypass Via Wsreset
id: 6ea3bf32-9680-422d-9f50-e90716b12a66
status: test
description: Unfixed method for UAC bypass from Windows 10. WSReset.exe file associated with the Windows Store. It will run a binary file contained in a low-privilege registry.
references:
    - https://www.bleepingcomputer.com/news/security/trickbot-uses-a-new-windows-10-uac-bypass-to-launch-quietly
    - https://lolbas-project.github.io/lolbas/Binaries/Wsreset
author: oscd.community, Dmitry Uchakin
date: 2020-10-07
modified: 2021-11-27
tags:
    - attack.privilege-escalation
    - attack.t1548.002
logsource:
    category: registry_event
    product: windows
detection:
    selection:
        TargetObject|endswith: '\AppX82a6gwre4fdg3bt635tn5ctqjf8msdd2\Shell\open\command'
    condition: selection
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imRegistry
| where RegistryKey endswith "\\AppX82a6gwre4fdg3bt635tn5ctqjf8msdd2\\Shell\\open\\command"

KQL (Microsoft 365 Defender)

DeviceRegistryEvents
| where RegistryKey endswith "\\AppX82a6gwre4fdg3bt635tn5ctqjf8msdd2\\Shell\\open\\command"

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

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

References

• https://www.bleepingcomputer.com/news/security/trickbot-uses-a-new-windows-10-uac-bypass-to-launch-quietly
• https://lolbas-project.github.io/lolbas/Binaries/Wsreset
• SigmaHQ Rule