Potentially Suspicious Event Viewer Child Process

calendar Oct 4, 2023 · attack.defense_evasion attack.privilege_escalation attack.t1548.002 car.2019-04-001  ·
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Detects uncommon or suspicious child processes of "eventvwr.exe" which might indicate a UAC bypass attempt

Sigma rule (View on GitHub)

 1title: Potentially Suspicious Event Viewer Child Process
 2id: be344333-921d-4c4d-8bb8-e584cf584780
 3related:
 4    - id: 7c81fec3-1c1d-43b0-996a-46753041b1b6
 5      type: derived
 6status: test
 7description: Detects uncommon or suspicious child processes of "eventvwr.exe" which might indicate a UAC bypass attempt
 8references:
 9    - https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/
10    - https://www.hybrid-analysis.com/sample/e122bc8bf291f15cab182a5d2d27b8db1e7019e4e96bb5cdbd1dfe7446f3f51f?environmentId=100
11author: Florian Roth (Nextron Systems)
12date: 2017/03/19
13modified: 2023/09/28
14tags:
15    - attack.defense_evasion
16    - attack.privilege_escalation
17    - attack.t1548.002
18    - car.2019-04-001
19logsource:
20    category: process_creation
21    product: windows
22detection:
23    selection:
24        ParentImage|endswith: '\eventvwr.exe'
25    filter_main_generic:
26        Image|endswith:
27            - ':\Windows\System32\mmc.exe'
28            - ':\Windows\System32\WerFault.exe'
29            - ':\Windows\SysWOW64\WerFault.exe'
30    condition: selection and not 1 of filter_main_*
31falsepositives:
32    - Unknown
33level: high

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