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I developed this funny trick while trying to find a solution for a problem in a project. It is pretty easy to implement and fun. The trick consists in abusing the offset field in the dylib_command and pointing it to somewhere else. From the Mach-O File Format Reference document, the command structures are: struct dylib_command { uint_32 cmd; uint_32 cmdsize; struct dylib dylib; } struct dylib { union lc_str name; uint_32 timestamp; uint_32 current_version; uint_32 compatibility_version; } union lc_str { uint32_t offset; #ifndef __LP64__ char *ptr; #endif } The definition of the offset field is:...

This Sunday I received a valid keygen solution for my crackme. Congratulations to the reverser who wishes to remain anonymous. When the solution is available our brain stops thinking and goes into lazy mode. So, my question is when do you want to have me starting to explain some of the tricks used in that crackme? Right now? Next week? In a month? I did some questions to the keygen author to better understand his attack....

My first OS X crackme is finally ready, after a long wait and some unnecessary teasing. Ready means that it is good enough to be released and hopefully give you some trouble to reverse and crack it. I still have many more ideas to implement and some areas could be more polished – it was time to take an executive decision and freeze the code. There are some assumptions (economists love this term) due to the crackme nature – if it was an application more fun games could be played....

This is a OS X port of kad’s checkidt utility featured at Phrack #59. It requires /dev/kmem to be active since task_for_pid on kernel task is prohibited since Snow Leopard. I have added an option to calculate the sysent address via the IDT. The code is not very fail proof because it uses the opcode hex values. Disassembly is probably a better option. This is just a PoC written some time ago so there are some ugly things inside....

Here is a small update to gdbinit with a new command, skip. This command will skip over the current instruction, without executing it. Usually I do it manually by set $pc=newvalue but this involves copy & paste and mouse movements and gets boring after a while. It’s great to skip over calls while you are trying some stuff and analysing some program behavior. By default it will not execute the command at the new address....