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.defense-evasion
12    - attack.t1574.001
13logsource:
14    product: windows
15    category: image_load
16detection:
17    selection:
18        ImageLoaded|endswith: '\mscorsvc.dll'
19    filter_main_generic:
20        ImageLoaded|startswith:
21            - 'C:\Windows\Microsoft.NET\Framework\'
22            - 'C:\Windows\Microsoft.NET\Framework64\'
23            - 'C:\Windows\Microsoft.NET\FrameworkArm\'
24            - 'C:\Windows\Microsoft.NET\FrameworkArm64\'
25            - 'C:\Windows\WinSxS\'
26    condition: selection and not 1 of filter_main_*
27falsepositives:
28    - Legitimate applications loading their own versions of the DLL mentioned in this rule.
29level: medium