Detection rules › Sigma
Potentially Suspicious Event Viewer Child Process
Detects uncommon or suspicious child processes of "eventvwr.exe" which might indicate a UAC bypass attempt
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | T1548.002 Abuse Elevation Control Mechanism: Bypass User Account Control |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Potentially Suspicious Event Viewer Child Process
id: be344333-921d-4c4d-8bb8-e584cf584780
related:
- id: 7c81fec3-1c1d-43b0-996a-46753041b1b6
type: derived
status: test
description: Detects uncommon or suspicious child processes of "eventvwr.exe" which might indicate a UAC bypass attempt
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:
category: process_creation
product: windows
detection:
selection:
ParentImage|endswith: '\eventvwr.exe'
filter_main_generic:
Image|endswith:
- ':\Windows\System32\mmc.exe'
- ':\Windows\System32\WerFault.exe'
- ':\Windows\SysWOW64\WerFault.exe'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_main_*Stage 1: selection
selection:
ParentImage|endswith: '\eventvwr.exe'
Stage 2: not filter_main_generic
filter_main_generic:
Image|endswith:
- ':\Windows\System32\mmc.exe'
- ':\Windows\System32\WerFault.exe'
- ':\Windows\SysWOW64\WerFault.exe'
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
Image | ends_with | :\Windows\SysWOW64\WerFault.exe |
Image | ends_with | :\Windows\System32\WerFault.exe |
Image | ends_with | :\Windows\System32\mmc.exe |
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
ParentImage | ends_with |
|