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+---
+Name: coregen.exe
+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.
+Author: Martin Sohn Christensen
+Created: 2020-10-09
+Commands:
+  - Command: coregon.exe.exe /L C:\folder\evil.dll dummy_assembly_name
+    Description: Loads the target .DLL in arbitrary path specified with /L.
+    Usecase: Execute DLL code
+    Category: Execute
+    Privileges: User
+    MitreID: T1055
+    MitreLink: https://attack.mitre.org/wiki/Technique/T1055
+    OperatingSystem: Windows
+  - Command: coregen.exe dummy_assembly_name
+    Description: Loads the coreclr.dll in the corgen.exe directory (e.g. C:\Program Files\Microsoft Silverlight\5.1.50918.0).
+    Usecase: Execute DLL code
+    Category: Execute
+    Privileges: User
+    MitreID: T1055
+    MitreLink: https://attack.mitre.org/wiki/Technique/T1055
+    OperatingSystem: Windows
+  - Command: coregen.exe /L C:\folder\evil.dll dummy_assembly_name
+    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.
+    Usecase: Execute DLL code
+    Category: AWL Bypass
+    Privileges: User
+    MitreID: T1218
+    MitreLink: https://attack.mitre.org/wiki/Technique/T1218
+    OperatingSystem: Windows
+Full_Path:
+  - Path: C:\Program Files\Microsoft Silverlight\5.1.50918.0\coregen.exe
+  - Path: C:\Program Files (x86)\Microsoft Silverlight\5.1.50918.0\coregen.exe
+Code_Sample: 
+  - Code: 
+Detection:
+  - IOC: coregen.exe loading .dll file not in "C:\Program Files (x86)\Microsoft Silverlight\5.1.50918.0\"
+  - IOC: coregen.exe loading .dll file not named coreclr.dll
+  - IOC: coregen.exe command line containing -L or -l
+  - IOC: coregen.exe command line containing unexpected/invald assembly name
+  - IOC: coregen.exe application crash by invalid assembly name
+Resources:
+  - Link: https://www.youtube.com/watch?v=75XImxOOInU
+  - Link: https://www.fireeye.com/blog/threat-research/2019/10/staying-hidden-on-the-endpoint-evading-detection-with-shellcode.html
+Acknowledgement:
+  - Person: Nicky Tyrer
+    Handle: 
+  - Person: Evan Pena
+    Handle: 
+  - Person: Casey Erikson
+    Handle: 
+---