downloadbrowseborismilner's 4N006135 - Level 4

Download, 21 kb (password:
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Following my previous submission of levels 0,1,2,3 here comes level number 4.

Difficulty: 1 - Very easy, for newbies
Platform: Windows
Language: Assembler

Published: 26. Oct, 2015
Downloads: 369


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Solution by aldeid, published 10. dec, 2015; download (156 kb), password: or browse.

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Solution by acruel, published 10. dec, 2015; download (2 kb), password: or browse.

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Discussion and comments

31. Oct 2015
I m a newbie.. And the first 4 .exe were very easy.. This seems to be easy but I need to figure out where the NOT A GOOD JOB string is because this time it is not clear.. I feel so stupid XD
31. Oct 2015
Ok I did it.. ahahah I m so happy
14. Nov 2015
hi borismilner,is this level-4,only need change the jno to jo?,the carckme some code is dynamic encryption,but the key algorithm,only at the begin of the code use the password we input ,check the password is not Mario ,other
where never use the password ,only use the 409000 to calulate the key and at last add 1000000,check if overflow or not
15. Nov 2015
You dont need patching.
24. Nov 2015
i can't figure out if there is a manipulation on the password,
it seems like not..
patching this is very , but im not sure this is the mission
any tips ?
24. Nov 2015
Lol it checks to make sure your name isn't "Mario". Almost done, I just need to finish up the part that executes if your name isn't Mario.

I saw some of it, and as I was stepping through, I noticed that the instructions were changing other instructions :o
26. Nov 2015
This may be a bug in the crackme? why the number to verify the password is taken from the stack, but not from our the entered password. It turns out that the value is always the same, and does not pass the test. sorry for bad english.
30. Nov 2015
Detailed solution posted here: Thanks you @acruel for your help.
15. Dec 2015
took me a few hours but I finally did it :)

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