mini4wdgp.cs

using System.IO;
using System.Security.Cryptography;

namespace Test
{
    class Program
    {
        static byte[] Decrypt(byte[] bytes)
        {
            var key = new byte[] { 0x90, 0x53, 0x76, 0x73, 0xa5, 0x80, 0xfb, 0xe1, 0x4c, 0xd1, 0x6b, 0x89, 0x95, 0x94, 0x1c, 0xc3 };
            var iv = new byte[] { 0xda, 0xa0, 0x1e, 0x0b, 0x3e, 0xd7, 0x9b, 0xec, 0x93, 0x48, 0xbd, 0xb3, 0x47, 0x52, 0x0e, 0x9e };

            var aes = Aes.Create();
            aes.Padding = PaddingMode.PKCS7;
            aes.Mode = CipherMode.CBC;

            using var decryptor = aes.CreateDecryptor(key, iv);
            return decryptor.TransformFinalBlock(bytes, 0, bytes.Length);
        }

        static void Main()
        {
            var bytes = File.ReadAllBytes("3c05c1e3a5cc1ca4fbfaaee1dd482787");
            bytes = Decrypt(bytes);
            File.WriteAllBytes("out.bin", bytes);
        }
    }
}