Windows 11 introduces updated Shim Database (SDB) components, including specific process names like SdbMergeTestEntry_Added_Exe_Item.exe that trigger unique system messages. These updates represent an evolution in how Windows handles compatibility shims, expanding on lists previously documented in earlier versions of the OS.
Beyond process names, Windows 11 features new directories for "AcPluginDlls" and corresponding test DLLs within the apppatch folder. These components, referenced by libraries such as apphelp.dll and pcasvc.dll, suggest a modular plugin mechanism for the shim engine that could potentially be abused by threat actors for persistence or stealthy code injection.
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