Gyver75 Posted November 30, 2014 Share Posted November 30, 2014 I've downloaded this crackme long time ago. Its difficult could be 2/10 but it's really funny and, above all, instructive. If you want to try something different ... Crackme.rar 2 Link to comment Share on other sites More sharing options...
ByteReverser Posted November 30, 2014 Share Posted November 30, 2014 buddy i download this but its not exe its file? Link to comment Share on other sites More sharing options...
Gyver75 Posted November 30, 2014 Author Share Posted November 30, 2014 yes ... the main purpose of this type of challlenge is examine the file and then, find its secret! A good start point is an Hex editor and, obviously, internet search! :-) 1 Link to comment Share on other sites More sharing options...
Solution mrexodia Posted November 30, 2014 Solution Share Posted November 30, 2014 (edited) Solution: PEEKPOKE Tutorial: Open up 'Cr4ckM3' in your favorite hex editor First check if you can find the signature (first 4-8 bytes) on google: 3F 3F 3F 3F or 31 35 34 31 have no interesting results, let's look further down. If you scroll down to 0x2D0 you will find a commonly-occurring pattern: A5 29 4A 52 94 <- various intersting hits on google! First link: http://ist.uwaterloo.ca/~schepers/formats/G64.TXT tells us the file should start with 47 43 52 2D instead of 3F 3F 3F 3F. Change this and save the file with the extension .g64 Download WinVICE (commodore 64 emulator): http://www.zimmers.net/anonftp/pub/cbm/crossplatform/emulators/VICE/WinVICE-2.3-x86.zip Open 'x64mm.exe' and use 'File->Autostart Disk image' and select our saved .g64 Appears to be running: Download http://style64.org/dirmaster to browse the contents of the .g64 file Let's look inside "SECRET": Try "PEEKPOKE" as code and everything appears to be in order: Mr. eXoDia Edited November 30, 2014 by Mr. eXoDia 5 Link to comment Share on other sites More sharing options...
Teddy Rogers Posted December 1, 2014 Share Posted December 1, 2014 The [crackme] tag has been added to your topic title. Please remember to follow and adhere to the topic title format - thankyou! [This is an automated reply] Link to comment Share on other sites More sharing options...
Gyver75 Posted December 1, 2014 Author Share Posted December 1, 2014 Well done Mr. eXoDia! Your solution is certainly faster than mine ... probably an old C*4 user would have had a different approach 1 Link to comment Share on other sites More sharing options...
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