mrexodia Posted January 11, 2012 Share Posted January 11, 2012 (edited) Hello everyone, Some time ago I posted an easy (1hour coding) crackme on hackforums.net but maybe here it'll be solved here faster This is a small crackme with some anti analysis, should be easy! Rules: * No patching * Valid solution is tutorial+used sources * Get password! Mr. eXoDia // T.P.o.D.T 2012 mr.exodia.tpodt@gmail.com http://www.tpodt.com Max time to solve should be 10 minutes (solve, not investigate)... Best regards, Mr. eXoDia CrackMe_HackForums-TPoDT.rar https://mega.nz/#!n4xmkArQ!ee5ElrB54EDNFMS5K2lvNk4q3O4AKSU2_eVpSjmUFlA Edited November 18, 2015 by Mr. eXoDia Link to comment Share on other sites More sharing options...
YuqseLx Posted January 11, 2012 Share Posted January 11, 2012 Hmm good crackme I found only this button click procedure = "0040393F". But i'm not good analysis Link to comment Share on other sites More sharing options...
DeadAndGone Posted January 11, 2012 Share Posted January 11, 2012 Easy one CrackMe-cracked.rar Link to comment Share on other sites More sharing options...
YuqseLx Posted January 11, 2012 Share Posted January 11, 2012 (edited) Easy one Are you read it? Rules:* No patching Edited January 11, 2012 by YuqseLx Link to comment Share on other sites More sharing options...
DeadAndGone Posted January 11, 2012 Share Posted January 11, 2012 Lol no i didnt read it xD Link to comment Share on other sites More sharing options...
YuqseLx Posted January 11, 2012 Share Posted January 11, 2012 Lol no i didnt read it xD no problem Link to comment Share on other sites More sharing options...
mrexodia Posted January 11, 2012 Author Share Posted January 11, 2012 Haha, patching isn't a big problem. Try fishsing instead.GReetz Link to comment Share on other sites More sharing options...
kakamail Posted January 12, 2012 Share Posted January 12, 2012 Actually, i don't know how your loop work, a long loop :-? After that we have an array. ex: inputserial = 1234 ----Loop---> 4F634667 E59B358C 281D496E E9FBA3F4 8FFDA27F. And now we work on 5 "Numbers" above by XOR-ing Algo, the final result must be equal = $Part1 What i want to say here is we have final result, that mean the loop can be reversed to compute serial. But your loop so complicated, i have no ideal to solve it Link to comment Share on other sites More sharing options...
mrexodia Posted January 12, 2012 Author Share Posted January 12, 2012 @kakamail: Try using a crypto detector some time... It might help you. But coding skill is required to solve this 100percent Link to comment Share on other sites More sharing options...
kakamail Posted January 12, 2012 Share Posted January 12, 2012 (edited) Yeah, scanned but i think sha0-1 with modified can not be reversed so i post my wonder. I'm not hopefully to solve any target anymore just do for fun coz i don't have time to improve my skill And yes, your kgm now beyond my level, good keygenme to me Gonna save it within tutorial to learn Edit abit for more clear Edited January 13, 2012 by kakamail Link to comment Share on other sites More sharing options...
mrexodia Posted January 12, 2012 Author Share Posted January 12, 2012 This is only a dword, max time to solve on my pc is 10 minutes Link to comment Share on other sites More sharing options...
Departure Posted January 13, 2012 Share Posted January 13, 2012 Mr eXoDia, Hackforums is no good for anything related to reverse engineering, Unless your looking for script kiddies want to be coders you should stay away from there before the 1337 h4cKers ddos you with there ub4r vb6 ddos t00lz. Sorry for going off topic I just know how that forum is... Anyway I will attept your keygenme tonight and hopefully have some luck Link to comment Share on other sites More sharing options...
mrexodia Posted January 13, 2012 Author Share Posted January 13, 2012 Mr eXoDia, Hackforums is no good for anything related to reverse engineering, Unless your looking for script kiddies want to be coders you should stay away from there before the 1337 h4cKers ddos you with there ub4r vb6 ddos t00lz. Sorry for going off topic I just know how that forum is... Anyway I will attept your keygenme tonight and hopefully have some luck Hmm, I agree but someone there provided me an Armadillo v8.60 Custom Build! I needed 10 posts to use the PM system Anyway, I think you can solve this. Don't hesitate to brute-force... A good coded bruter can do this in 4-5 minutes (on a quad core pc) Greetings Link to comment Share on other sites More sharing options...
Departure Posted January 15, 2012 Share Posted January 15, 2012 Serial = "1234"Use ollydebug 2 to advoid the anti's or plugin with olly debug 1.10 Link to comment Share on other sites More sharing options...
mrexodia Posted January 15, 2012 Author Share Posted January 15, 2012 ? That serial isn't really valid on my pc...Best regards Link to comment Share on other sites More sharing options...
Departure Posted January 16, 2012 Share Posted January 16, 2012 (edited) open it with olly debug 2 and enter that serial considering its a Multi Serial "crackme" try the serials "codebugs" and "backtothedrawingboard" all wich work under ollydebug 2 without patching anything. Also see below for requested tutorial as part of the crackme.... Tutorial: 1. Open the challenge with OllyDebug2 2. press run 3. enter any serial and press check 4. Olly will break 2 or 3 times on the INT3 5. press F9 to continue execution 5. good boy message. Challanged solved as requested with tutorial and no patching, while a good coder could code a "brute forcer" a smart coder doesn't even need to code to solve this in 20 seconds... Thanks and Regards.... Edited January 16, 2012 by Departure Link to comment Share on other sites More sharing options...
mrexodia Posted January 16, 2012 Author Share Posted January 16, 2012 Haha, indeed a really smart solution. But the algo is designed to go to the badboy place when an INT3 occurs...Anyways, really smart...Greetings Link to comment Share on other sites More sharing options...
DE! Posted January 20, 2012 Share Posted January 20, 2012 (edited) Serial : 135FF6D5042EDCB42 Source code with some explication attached. To compile you'll need freepascal and lazarus (or CodeTyphon) Probably not the fastest or easiest way to find a serial but anyway.. i got the "goodboy" popup at last BTW.. I liked your INT3 and OutputDebugStringA trick Tutorial is also added in this post Update : Fixed typo's in PDF crackme_sol.rar CrackMe.pdf Edited January 21, 2012 by DE! 4 Link to comment Share on other sites More sharing options...
mrexodia Posted January 21, 2012 Author Share Posted January 21, 2012 @DE!: Thanks a lot for your solution, I'll post it on my website Greetings, Mr. eXoDia Link to comment Share on other sites More sharing options...
DE! Posted January 21, 2012 Share Posted January 21, 2012 @DE!: Thanks a lot for your solution, I'll post it on my website Greetings, Mr. eXoDia Thanks Btw.. i fixed some typo mistakes in the pdf so i'll upload an updated one later this evening 1 Link to comment Share on other sites More sharing options...
Departure Posted January 22, 2012 Share Posted January 22, 2012 Thanks DE! for the tutorial, May I suggest using threads in your code to make brute forcing faster you could have 2 or 4 threads, 1 thread starting from 10000000, 1 thread starting from FFFFFFFF and going backwards, then if you wanted more than 2 threads start the other 2 at 80000000 one increasing while the other decreases Link to comment Share on other sites More sharing options...
DE! Posted February 1, 2012 Share Posted February 1, 2012 Thanks DE! for the tutorial, May I suggest using threads in your code to make brute forcing faster you could have 2 or 4 threads, 1 thread starting from 10000000, 1 thread starting from FFFFFFFF and going backwards, then if you wanted more than 2 threads start the other 2 at 80000000 one increasing while the other decreasesThanks for the suggestion!.. I modified the code so it would run in 4 threads $10000000 -> $50000000 $50000001 -> $A0000000 $A0000001 -> $E0000000 $E0000001 -> $FFFFFFFFand its indeed faster, although i had to add some sleep(1) inside the threads, otherwise cpu would freak out...The sleep(1) on the other hand made it slower... Thanks! Link to comment Share on other sites More sharing options...
mrexodia Posted February 1, 2012 Author Share Posted February 1, 2012 I had to add some sleep(1) inside the threads, otherwise cpu would freak out...Just make the thread priority of 1 thread very low or just use 3 threads...Greetings Link to comment Share on other sites More sharing options...
Departure Posted February 1, 2012 Share Posted February 1, 2012 (edited) SetThreadPriority(GetCurrentThread , THREAD_PRIORITY_LOWEST);you can use THREAD_PRIORITY_HIGHEST, THREAD_PRIORITY_ABOVE_NORMAL, THREAD_PRIORITY_NORMAL, THREAD_PRIORITY_BELOW_NORMAL, THREAD_PRIORITY_LOWEST and THREAD_PRIORITY_IDLE Edited February 1, 2012 by Departure Link to comment Share on other sites More sharing options...
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