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reverse-eng-dotnet

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Reverse a .NET / C# assembly — decompile, deobfuscate, debug, and IL-patch managed binaries. Load when the target is a managed PE (.exe/.dll with a CLR header), a Sharp* red-team tool (Rubeus, SharpHound, Seatbelt), a ConfuserEx/SmartAssembly/Babel/.NET-Reactor-obfuscated sample, or a .NET loader/stealer. Signals: "mscoree" / "_CorExeMain" / "mscorlib" strings, garbled Unicode class names in a decompiler, "deobfuscate this .NET", "patch/keygen a C# binary".

skills/reverse-engineering/reverse-eng-dotnet/SKILL.md

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Oct 14, 2026
License
MIT

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# .NET / C# assembly reversing

## When it applies
The binary is a managed .NET assembly — a thick client, a Sharp* red-team tool, or a captured
loader/stealer — and it is in scope (`tradecraft-scope-roe`, `scope.txt`). Pure-native PEs, IL2CPP
Unity builds, and NativeAOT output carry no CLR metadata: those go to `reverse-eng-binary-triage`.
dnSpyEx (the only GUI with an IL editor and debugger) is Windows-only; on Linux/macOS use
`ilspycmd` + `dotnet de4dot.dll` and accept that interactive patching/debugging needs Windows.

## Why it works
Managed assemblies keep near-complete metadata — type, method, and field names survive
compilation, so decompilation recovers close-to-source C#. Obfuscators only scramble names,
strings, and control flow, and de4dot automates the unscrambling for the common families. The IL
instruction stream is the ground truth: the C# view loses or distorts compiler-generated code
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