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* Adding various tags as a first iteration * Adding quotes * Adding 'Custom Format' properly * Updating to key:value pairs * Update template
51 lines
2.4 KiB
YAML
51 lines
2.4 KiB
YAML
---
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Name: coregen.exe
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Description: Binary coregen.exe (Microsoft CoreCLR Native Image Generator) loads exported function GetCLRRuntimeHost from coreclr.dll or from .DLL in arbitrary path. Coregen is located within "C:\Program Files (x86)\Microsoft Silverlight\5.1.50918.0\" or another version of Silverlight. Coregen is signed by Microsoft and bundled with Microsoft Silverlight.
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Author: Martin Sohn Christensen
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Created: 2020-10-09
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Commands:
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- Command: coregen.exe /L C:\folder\evil.dll dummy_assembly_name
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Description: Loads the target .DLL in arbitrary path specified with /L.
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Usecase: Execute DLL code
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Category: Execute
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Privileges: User
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MitreID: T1055
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OperatingSystem: Windows
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Tags:
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- Execute: DLL
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- Command: coregen.exe dummy_assembly_name
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Description: Loads the coreclr.dll in the corgen.exe directory (e.g. C:\Program Files\Microsoft Silverlight\5.1.50918.0).
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Usecase: Execute DLL code
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Category: Execute
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Privileges: User
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MitreID: T1055
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OperatingSystem: Windows
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- Command: coregen.exe /L C:\folder\evil.dll dummy_assembly_name
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Description: Loads the target .DLL in arbitrary path specified with /L. Since binary is signed it can also be used to bypass application whitelisting solutions.
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Usecase: Execute DLL code
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Category: AWL Bypass
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Privileges: User
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MitreID: T1218
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OperatingSystem: Windows
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Tags:
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- Execute: DLL
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Full_Path:
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- Path: C:\Program Files\Microsoft Silverlight\5.1.50918.0\coregen.exe
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- Path: C:\Program Files (x86)\Microsoft Silverlight\5.1.50918.0\coregen.exe
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Code_Sample:
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- Code:
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Detection:
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- Sigma: https://github.com/SigmaHQ/sigma/blob/b02e3b698afbaae143ac4fb36236eb0b41122ed7/rules/windows/image_load/image_load_side_load_coregen.yml
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- IOC: coregen.exe loading .dll file not in "C:\Program Files (x86)\Microsoft Silverlight\5.1.50918.0\"
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- IOC: coregen.exe loading .dll file not named coreclr.dll
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- IOC: coregen.exe command line containing -L or -l
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- IOC: coregen.exe command line containing unexpected/invald assembly name
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- IOC: coregen.exe application crash by invalid assembly name
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Resources:
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- Link: https://www.youtube.com/watch?v=75XImxOOInU
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- Link: https://www.fireeye.com/blog/threat-research/2019/10/staying-hidden-on-the-endpoint-evading-detection-with-shellcode.html
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Acknowledgement:
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- Person: Nicky Tyrer
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- Person: Evan Pena
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- Person: Casey Erikson
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