sw33tLie's Input Magic

Author:
sw33tLie

Language:
C/C++

Upload:
2019-03-28 15:21

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Platform:
Windows

Difficulty:
1.7

Quality:
4.0

Arch:
x86

Downloads:
3

Writeups:
3

Comments:
14

Description

NO PATCHING ALLOWED! Find the right string (of any size) to input in the console in order to get the valid license message.

Comments (14)
Writeups (3)

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GautamGreat on 2019-03-29 12:33: I dunno why but it crash in Windows 7 x86

Rufis_ on 2019-03-29 18:51: Very easy?

omniarepair on 2019-03-30 14:50: same here cant seem to get it work on windows 8 neither

kalipo on 2019-03-31 09:53: The correct key is '?'

kalipo on 2019-03-31 09:56: Actually the code just checks if the first character is ? the rest are ignored. So the answer is ? followed by anything

Moltivie on 2019-05-17 08:16: When Ghidra comes in... http[s]://im[gu]r.c[o]m/a/6hM8a9K

evilprogrammer on 2019-07-16 05:27: the answer is in this line: DIV ECX the line above means like this EDX

Parad0x13 on 2019-09-05 03:28: License: ? "Congrats! This license is valid!" string easily found and xrefd only at 0xbf26c8 Analyzing the decomp for this function I see that: len(license) % 0x3c must equal 3 license must be larger than 0x2a license must be smaller than 0x48 This can be easily found with the following python: for n in range(0x2a + 1, 0x48): if n % 0x3c == 3: print(chr(n))

juansacco on 2019-10-04 20:53: The crackme only checks for the serial to start with ? Does not check for size, smaller or larger than, so some of the explainations here are wrong. xor edx, edx ; Logical Exclusive OR mov ecx, 3Ch ; '

juansacco on 2019-10-04 20:53: ENTER LICENSE: ? Congrats! This license is valid!

hareega on 2020-05-03 04:18: a character % is equal to 0x03 between 0x2A and 0x48 PowerShell solution : ❯ For ($i=0x2A ; $i -le 0x48; $i++) { if ( $i % 0x3c -eq 0x03 ) { Write-Host ($i -as [char])} }

maxicek on 2020-08-01 13:20: well, thought it would be harder.. :D https://pastebin.com/rKXieuzw

NCP on 2020-10-17 08:19: What does the program do with those weird byte chains in main?

DasGamerPro on 2020-12-07 22:24: I patched it sorry you can show me how to do it with no pathing?

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Solution by S01den on 2019-03-28 17:58:
a solution in french

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Solution by Jacket on 2019-03-29 16:11:

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Solution by 4rr4y on 2020-02-27 09:28:

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crackmes.one

crackmes.one

sw33tLie's Input Magic