Author:
mucki

Language:
Assembler

Upload:
2019-05-03 13:28

Download

Platform:
Windows

Difficulty:
3.0

Quality:
4.0

Arch:
x86

Downloads:
4

Writeups:
2

Comments:
11

Description

This is my 9th crackme (keygenme), written in MASM. - create a keygen - and submit a tutorial tested on WinXP SP1 but should also work on other windows os. Source included. Password is the valid serial for mucki. Regards, mucki

• Comments (11)
• Writeups (2)

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S01den on 2019-05-25 21:05: SPOILER: Are you sure this is possible ? I don't know how to get EAX = 0 with 00401A66 |. XOR EAX,DWORD PTR DS:[40711A] 00401A6C |. DIV EAX 00401A6E |. OR EAX,EAX because EDX is constant (0x40711B). Thanks

mucki on 2019-05-26 13:31: Yes, this is possible. Hint #1: It's a self debugging crackme. You must call the master process at this point. Hint #2: Use character '=' to fill the gap.

x0r19x91 on 2019-05-27 01:11: I got EAX = 0

x0r19x91 on 2019-05-27 01:11: But ArithMetic Exception

x0r19x91 on 2019-05-27 01:13: It would have been better if there was a discord channel

x0r19x91 on 2019-05-27 02:06: Solved It ! It was a nice crackme :-) Thanks

Elvis on 2019-05-28 09:25: Hmm I have found out the idea. Nice crackme BTW :)

Elvis on 2019-05-28 10:03: Hmm you forgot deleting the function at 0x4014A8. Using this function I was able to generate my own valid serial :) Elvis/6nNx9Q============

mucki on 2019-05-28 14:26: I'm glad you liked it. I just used standard stuff (crc32/base64) so I thought a base64 encoder would be nothing special (you can even find online encoders).

HN1 on 2019-05-30 16:34: =============================================================== Username: HN1 Serial: JJgTQa============ ===============================================================

HN1 on 2019-05-30 17:40: =============================================================== Username: mucki Serial: WfVo/A============ ===============================================================

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