Author:
expl0itr

Language:
.NET

Upload:
11:36 AM 07/12/2022

Download

Platform
Windows

Difficulty:
3.5

Quality:
4.0

Arch:
x86

Description

This crackme was programmed with .NET 4.8 but ported to real x86 native code. Brace yourself for a challenge!

• Comments
• Writeups

You must be logged in to post a comment

db123 on 1:20 AM 07/25/2022: unpack it by de4dot, and then debug it by dnspy. it has a datetime check and we need dump the picture byte array to a file by this code in watch view: System.IO.File.WriteAllBytes("rew1nd.png", array20) if you want to patch it, you can edit il in dnspy directly.

expl0itr on 8:57 AM 07/25/2022: Well done, db123! Any chance you could upload your full solution?

someontop on 2:23 PM 07/29/2022: @db123 can i contact with u?

mrmoded on 11:28 AM 08/31/2022: flag{rew0und_succ3sfully.g00d_j0b}

keugene on 4:22 PM 11/19/2022: // Rew1nd.Rot47 // Token: 0x06000006 RID: 6 RVA: 0x0000298C File Offset: 0x00000B8C public static string rot47_it(string data) { byte[] array = Rot47.ByteSequence(33, 126).ToArray(); byte[] bytes = Encoding.ASCII.GetBytes(data); List list = new List(); foreach (byte b in bytes) { byte b2 = b; if (b2 126) { list.Add(b2); } else { int num = (int)(b2 - 33 + 47); if (num 94) { num -= 94; } if (num == 94) { num = 0; } list.Add(array[(int)Convert.ToByte(num)]); } } return Encoding.ASCII.GetString(list.ToArray()); } lol ?

You must be logged in to submit a writeup