Potential DLL Sideloading Using Coregen.exe

 1title: Potential DLL Sideloading Using Coregen.exe
 2id: 0fa66f66-e3f6-4a9c-93f8-4f2610b00171
 3status: test
 4description: Detect usage of the "coregen.exe" (Microsoft CoreCLR Native Image Generator) binary to sideload arbitrary DLLs.
 5references:
 6    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Coregen/
 7author: frack113
 8date: 2022-12-31
 9tags:
10    - attack.defense-evasion
11    - attack.t1218
12    - attack.t1055
13logsource:
14    category: image_load
15    product: windows
16detection:
17    selection:
18        Image|endswith: '\coregen.exe'
19    filter_main_legit_paths:
20        ImageLoaded|startswith:
21            - 'C:\Program Files (x86)\Microsoft Silverlight\'
22            - 'C:\Program Files\Microsoft Silverlight\'
23            - 'C:\Windows\System32\'
24            - 'C:\Windows\SysWOW64\'
25    condition: selection and not 1 of filter_main_*
26falsepositives:
27    - Unknown
28level: medium