Detection rules › Sigma
UAC Bypass Using Windows Media Player - File
Detects the pattern of UAC Bypass using Windows Media Player osksupport.dll (UACMe 32)
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 11: FileCreate |
Rule body
title: UAC Bypass Using Windows Media Player - File
id: 68578b43-65df-4f81-9a9b-92f32711a951
status: test
description: Detects the pattern of UAC Bypass using Windows Media Player osksupport.dll (UACMe 32)
references:
- https://github.com/hfiref0x/UACME
author: Christian Burkard (Nextron Systems)
date: 2021-08-23
modified: 2022-10-09
tags:
- attack.privilege-escalation
- attack.t1548.002
logsource:
category: file_event
product: windows
detection:
selection1:
TargetFilename|startswith: 'C:\Users\'
TargetFilename|endswith: '\AppData\Local\Temp\OskSupport.dll'
selection2:
Image: 'C:\Windows\system32\DllHost.exe'
TargetFilename: 'C:\Program Files\Windows Media Player\osk.exe'
condition: 1 of selection*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
1 of selection*Stage 1: selection1
selection1:
TargetFilename|startswith: 'C:\Users\'
TargetFilename|endswith: '\AppData\Local\Temp\OskSupport.dll'
Stage 2: selection2
selection2:
Image: 'C:\Windows\system32\DllHost.exe'
TargetFilename: 'C:\Program Files\Windows Media Player\osk.exe'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
Image | eq |
| field:"Image" kind:eq value:"C:\Windows\system32\DllHost.exe" |
TargetFilename | ends_with |
| field:"TargetFilename" kind:ends_with value:"\AppData\Local\Temp\OskSupport.dll" |
TargetFilename | eq |
| field:"TargetFilename" kind:eq value:"C:\Program Files\Windows Media Player\osk.exe" |
TargetFilename | starts_with |
| field:"TargetFilename" kind:starts_with value:"C:\Users\" |