UAC Bypass Via Wsreset

Status: test
Severity: high
Log source: category registry_event, product windows
Author: oscd.community, Dmitry Uchakin
Source: github.com/SigmaHQ/sigma

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.

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1548.002` Abuse Elevation Control Mechanism: Bypass User Account Control

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 12: RegistryEvent (Object create and delete)
Sysmon	Event ID 13: RegistryEvent (Value Set)
Sysmon	Event ID 14: RegistryEvent (Key and Value Rename)

Rule body

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

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    TargetObject|endswith: '\AppX82a6gwre4fdg3bt635tn5ctqjf8msdd2\Shell\open\command'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`TargetObject`	ends_with	`\AppX82a6gwre4fdg3bt635tn5ctqjf8msdd2\Shell\open\command`	`field:"TargetObject" kind:ends_with value:"\AppX82a6gwre4fdg3bt635tn5ctqjf8msdd2\Shell\open\command"`