.NET Reactor v7.5.9.1 (Aggressive Settings + Custom Anti-Tamper)

Hey everyone,

I put together a small challenge for anyone interested in reversing .NET protections. This one is packed using .NET Reactor v7.5.9.1 with some pretty aggressive settings, along with a bit of custom anti-tamper logic on top.

Your goal is to unpack the application and recover a clean, working assembly.

1. Protections Enabled
   NecroBit
   String Encryption
   Obfuscation
   Anti ILDASM
   Hide Method Calls
   Code Virtualization
   Anti Tampering
   Anti Debug
   Merge Enums
   Control Flow Obfuscation (Level 9)
   

2. Additional Protections

   Custom runtime anti-debug

   Anti-injection checks

   Integrity verification

   A background watchdog thread

🎯 Objectives
1. Primary: Unpack the application and produce a clean assembly that runs without errors
2. Bonus: Recover the correct password (completely optional)

File Information

Submitter Visual Studio

Submitted 04/13/2026

Category UnPackMe (.NET)

View File

Does .NET Reactor 7.5.9.1 exist in the world? Seems the latest is 7.5 : https://www.eziriz.com/reactor_download.htm

12 hours ago, CreateAndInject said:

Does .NET Reactor 7.5.9.1 exist in the world? Seems the latest is 7.5 : https://www.eziriz.com/reactor_download.htm

Sure does.

1 hour ago, Visual Studio said:

Sure does.

Hello, could you please share the installation package?

please...thank you

13 minutes ago, cjhrb said:

Hello, could you please share the installation package?

please...thank you

I am sorry, I can't as its not public yet. Don't want anything coming back on me.

14 minutes ago, Visual Studio said:

I am sorry, I can't as its not public yet. Don't want anything coming back on me.

ok , I am so sorry to bather you.

thank you .

4 hours ago, Visual Studio said:

Sure does.

How do you get it?