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PoC: Prevent a debugger from attaching to managed .NET processes via a watcher process code pattern.

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dnSpy can still bypass that protection. It will work for debugging tool like OllyDbg, x64Dbg and IDA but managed code decompiler tool will bypass that protection.

Hi, I tested that in VS2019 v16.6 and it debugged without any preventing. But when the .Net version increased to v4.0 or later version then the `IsDebuggerPresent` method gets true...