sprx reversing

[sbmotoracer]

I was wondering if someone can give me a hand decrypting/reversing some sprxs. From my understanding there are 2 ways to decrypt them using unself and via an app on the ps3.

Since my ps3 is in the shop having a flasher put in I don't have the option of decrypting it on the ps3.

When I try with unself it decrypts successfully but when loaded into IDA to crashes....

I've tried it with a few different prxs so I know its not something to do with the prx.

What am missing to get them load into ida??? I realize the app is called unself(hence for self files) but in my internet travels I've been told unself works for them too.

Thank you for help

[sbmotoracer]

Not sure if this will help anyone but I found my answer posted there : http ://(remove this)coderslynk.(remove this)blogspot.(remove this)ca/2011/06/ps3-ida-tutorial.(remove this)html

Anonymous

I followed your description, trying to load an unself'd .sprx into IDA for analysis. Depending on which mode I use (32 bit or 64 bit), IDA either reports that the file doesn't contain any instructions or data (and I end up with a single 0xFFFFFFFF as contents) or claims to load the file into the database but never finishes (i.e. displays this dialog for hours and hours and ...).

I tried with different sprx files from different versions of the firmware. The unself'd ELFs look alright to me in a hex editor, but IDA won't load anything. Is any special version of IDA required? Which one works? Anything else I can try to make things work?
Posted on: June 19, 2011 9:36 AM
Slynk

To load sprx files just load the file as an elf, not ps3 loader. Then use analyze_sprx. idc
Posted on: June 19, 2011 3:50 PM
Anonymous

Thanks! This works -- at least for a couple of sprx files, not all.