ConfuserEx has long been one of the most popular open-source obfuscators for .NET applications. While the original project is no longer actively maintained, its legacy lives on through countless forks and modified versions used by malware authors and software protectors alike.
Methodology: Pure emulation-based unpacking for higher stability. confuserex-unpacker-2
Emulation-Based Analysis: The tool is heavily based on a custom instruction emulator, which allows it to statically analyze and unpack files more accurately, even if they haven't been heavily modified from the original ConfuserEx source. Open the assembly in ILSpy/dnSpy/dotPeek