Tuesday, April 10, 2012

android reverse tools - ART

here's a cool tool i was shown the other day. it's an easy-mode gui for all your decompiling and recompiling needs. ordinarily this would be rather unimpressive. it's not too hard to write a little wrapper for some java commands, but he/she really put some polish on this.

not only does it come with everything you need, including java and bits of the android sdk, but it even has a slick manual and a complete walk-through for my lesson0.crackme0.

here's a screen shot of the app:

here's the link to download (24mb): http://ul.to/or3kme6t
virus scan: https://www.virustotal.com/file/f6ac4279161b666811d80736a7a23790709c5b3ccb36a8f83dd138d9601eb480/analysis/1334082130/

as a first exercise, i recommend that you update the apktool included with the pack. it may have gone out of date. you can update the other components if you're so inclined but it might not help much.

if you have any trouble decompiling or compiling, remember it's using apktool under the hood so trouble shoot apktool first.

and if you want some more crackmes to try, here's deurus' profile on crackmes.de: http://crackmes.de/users/deurus

Wednesday, January 18, 2012

self-keygen tutorial by synack

previously, i posted a keygen tutorial and challenge, and synack has put his solution forward along with an interesting tutorial on creating a self-keygen, or a keygen that makes use of the original code to do the heavy lifting. it's very clearly written and organized, with plenty of good insight into the thought process as opposed to low-level "click here change this with no idea why" style tutorials.

download the solution and tutorial here: http://www.mediafire.com/?wzc45p269bcpbr5

Saturday, January 14, 2012

keygen tutorial and challenge by zAWS!

keygen'ing as a style of cracking requires you to really know and understand how the protection works. it also requires no modification of the original application, so is a very pure way of cracking.

zAWS!, who posted a keygen for lesson 0's crackme0b, sent me this challenge to share:

but before you start, you may want to see his/her keygen tutorial. it comes with the original apk and has videos showing the process:

Friday, January 6, 2012

way of the android cracker 0 rewrite

i have learned a lot since first writing way of the android cracker so i rewrote it. actually i rewrote it about 17 times. this one was the least annoyingly pedantic.

here's a direct link: http://www.mediafire.com/download.php?5ybhkqbzwguubf3

lesson 1 rewrite is next.

update: crackme0b has been updated. thanks to zAWS! for writing a keygen for crackme0b so quickly (even copied the icon) and helping me see it. unfortunately the update breaks the keygen.