make reverse shell undetectable by antivirus in csharp

To make a reverse shell undetectable by antivirus in C#, there are a few techniques that can be used:

1. Obfuscation: This involves changing the code so that it becomes difficult for antivirus software to detect it. Common obfuscation techniques in C# include renaming variables, functions, and classes, inserting junk code, and encrypting strings.

2. Binary Packing: Binary packing is a technique to compress an executable file and make it harder for antivirus software to detect. This can be achieved by using tools like UPX or Themida.

3. Custom Payload: Writing a custom payload with unique features is another technique that can be used to evade antivirus detection. A custom payload may use a different protocol or listen on an uncommon port than the standard ports used by usual shellcodes.

4. Fileless Payload: A fileless payload can be used to run shellcodes without writing them to disk. This way, antivirus software will not be able to scan the payload and detect it. This can be achieved using Reflective DLL injection techniques.

It is essential to keep in mind that using reverse shells for malicious purposes is illegal and immoral. These techniques should only be used for ethical penetration testing purposes.