SecurityGoogle Project Zero4 months ago
A Deep Dive into the GetProcessHandleFromHwnd API
17 min read
The GetProcessHandleFromHwnd API documentation contains three inaccuracies. UIAccess alone is insufficient for windows hooks; the caller needs equal or higher integrity level. In Windows 11, the API opens the process directly via a kernel function, not windows hooks. The Quick Assist bypass works across different users, contradicting the documentation.
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