Potential DLL Sideloading Of MsCorSvc.DLL

 1title: Potential DLL Sideloading Of MsCorSvc.DLL
 2id: cdb15e19-c2d0-432a-928e-e49c8c60dcf2
 3status: test
 4description: Detects potential DLL sideloading of "mscorsvc.dll".
 5references:
 6    - https://hijacklibs.net/entries/microsoft/built-in/mscorsvc.html
 7author: Wietze Beukema
 8date: 2024-07-11
 9modified: 2025-02-26
10tags:
11    - attack.privilege-escalation
12    - attack.persistence
13    - attack.execution
14    - attack.stealth
15    - attack.t1574.001
16logsource:
17    product: windows
18    category: image_load
19detection:
20    selection:
21        ImageLoaded|endswith: '\mscorsvc.dll'
22    filter_main_generic:
23        ImageLoaded|startswith:
24            - 'C:\Windows\Microsoft.NET\Framework\'
25            - 'C:\Windows\Microsoft.NET\Framework64\'
26            - 'C:\Windows\Microsoft.NET\FrameworkArm\'
27            - 'C:\Windows\Microsoft.NET\FrameworkArm64\'
28            - 'C:\Windows\WinSxS\'
29    condition: selection and not 1 of filter_main_*
30falsepositives:
31    - Legitimate applications loading their own versions of the DLL mentioned in this rule.
32level: medium