ultrasound's End Of the World!
| Download EndOfWorld.zip, 19 kb (password: crackmes.de) Browse contents of EndOfWorld.zip Mission: You have found an electronic diary which holds the date to the end of the world along with a note on how to survive.
Difficulty: 5 - Professional problem to solve | Send a message to ultrasound » View profile of ultrasound » |
Solutions
Solution by merker, published 29. dec, 2005; download (14 kb), password: crackmes.de or browse.
merker has not rated this crackme yet.
Discussion and comments
| code_inside 31. Oct 2005 | Nice CrackMe. But the CrackMe crashes because of a division by zero (When you type 1 char in the password field) in the uhm, Password-Date-Data-Decryption routine :) |
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| code_inside 31. Oct 2005 | A little correction from what I said above, It happens when you enter any other char then "a-z" in the password field (Atleast it crashed when I entered "1" :) ). |
| code_inside 31. Oct 2005 | And it only happens when the first character is any other character then "a-z" ;) (Now I stop flooding this thread... ;) ). |
| ultrasound Author 31. Oct 2005 | Hi Code_inside, thanks for reporting the bug, yes as you have mentioned I just tested and it will crash if the first character is not a-z, you can enter non-alphabetic characters at any other point in the password, as long as its not the first character.. I think i know why this is happening and I will fix this bug tonight when I get home.. Would you prefer me to upload the fixed version, or just leave it as it is, so as not to change the code that you have already reversed? |
| bigboss1988 31. Oct 2005 | crackMe doesn't work ! Is it a trick? If it a trick i know it ;) 1-DebugBreak 2-IsDebuggerPreSent 3- etc...:D |
| ultrasound Author 31. Oct 2005 | bigboss, yes you are correct, crackme will not run with a debugger running, you must disable this.. also debugbreak is correct :) |
| code_inside 31. Oct 2005 | ultrasound, The bug isn't really a big problem but still it is a little bug ;) I don't think that you need to change the code a lot though, just a little check will probably do... :) You decide if you want to upload a fixed version ;) |
| ultrasound Author 01. Nov 2005 | Bug now fixed, new version online ;) |
| ultrasound Author 17. Nov 2005 | how is everyone getting on with this? i cant tell if people are downloading and then giving up or if people are hard at work! any comments on what youve done so far? |
| code_inside 23. Nov 2005 | Hi ultrasound, At the moment i'm trying to reverse the Date Hash, but I think it can't be reversed because the date string doesn't always has the same length and that's a problem... :) I'm probably missing something again but right now I don't see a way of reversing it... I also don't know how to decrypt the strings, guessing? :) Has anyone else solved it? (Or one of the two parts?) |
| ultrasound Author 23. Nov 2005 | glad to see your on with it.. I guess my packing and anti-debug tricks didnt cause you too much problem then, but at least the main part is :) good luck! |
| code_inside 24. Nov 2005 | Packing and Anti-Stuff didn't cause any problems, especially not if you use SoftICE ;) It's always funny to see all those OllyDbg protections in CrackMe's when you're using SoftICE ;) |
| deroko 24. Nov 2005 | I agree with code_inside about olly protection and sice =)))) |
| ultrasound Author 30. Dec 2005 | superb merker, well done! |
| Shism 30. Dec 2005 | any documentation of the anti-debugging trick please? |
| merker 30. Dec 2005 | @ultrasound : thank you, its a great idea to use a diary as crackme. @Shism : anti-debugging is under the law of Murphy : 1. protect your app against debugger A. 2. protect your app against debugger B. result : everybody uses debugger C. |
| Shism 30. Dec 2005 | How about this one> My anti-debugging is under the law of Shism : 1.Protect against every single damn debugger |
| DeepBlue 31. Dec 2005 | So Shism: Let me see how you write a protection against a non-intrusive Debugger? ;) |
| deroko 31. Dec 2005 | haha non-intrusive =) I'm currently developing imprec plugin for nonintrusive debugging so I can fix imports in warranty's unpackme 3 =) @DeepBlue: I would check for hooks in kiuserexceptiondispatcher =) |
| DeepBlue 31. Dec 2005 | u bastard :P ;) |
| Shism 31. Dec 2005 | a non-intrusive Debugger is a Decompiler..... |
| DeepBlue 31. Dec 2005 | Ever heard of Oraculums? ;) Search in google: Oraculums "eb fe" |
| Shism 31. Dec 2005 | A loader.... There is always a way to defeat a cracking technique and there is always a way to defeat that anti-cracking technique... It goes on forever :) |
| strelok 28. Feb 2006 | damn, i got all dates, but planned to write dictonary-based bruteforcer to get pass everything is even easier |
| ultrasound Author 20. Apr 2006 | crackme source code is available here: http://files.jmpeip.com/ultrasound/src/EndOfWorld/ |
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