The MBA is over and I’m enjoying my vacations to clear stuff from the Todo list, to read books, to play some games and to do other stuff. Today the MacSerialJunkies contest started and I decided to give it a go. It’s a very simple crackme with a small twist where you have to bruteforce a MD5 string. I had reversed the serial routine and was starting the bruteforce without thinking much about it (first attempts were by searching online MD5 hashes databases for the correspondent plaintext but no such luck)....

Hi! I just updated the crackmes with #5 from MSJ challenge and added a new tool for encrypting/decrypting apple encrypted binaries. I had planned to do this tool but it’s great that someone did it first! It’s good to see people developing tools for OS X, even if they are very simple. Thank you to the author and to the guy who pointed me to it and sent the crackme 😉....

I had this one working for a long time but I hadn’t released it because I was trying to hijack fork and vfork calls. My objective was to introduce an int3 so I could attach the debugger to a selected process. At that time I suspected that VLOK was forking and I couldn’t debug the new process since follow on fork GDB function isn’t implemented in OS X (so this looks like a good idea for a protection 😉)....

Hello, I have just added a page to collect crackmes for OS X. I have added the ones that I already had and some recommended from user comments. Since corruptfire.com seems down I cannot retrieve the other ones they had. If you have more crackmes please mail them to me so I can add them to the page. It would be nice to start having more crackmes developed for OS X....

I was bored and decided to fix gdbinit to support 64 bit binaries. I had tried it before but the solution was a piece of crap (not that this one is much better). I was testing the registers to see if the binary was 32 or 64 bit. Now there is a default setting to 32 bit (change it if you want to default to 64 bit) and two commands, 32bits and 64bits to change between the two types of targets....