Thursday, January 22, 2009
I did something I hadnt done in a long time….
I cracked a DOS app.
Yeah, thats right an old school MS-DOS application.
OK, I didnt really crack it, I neutered the nagware screens on the shareware.
I had, once looong ago de-nagged a previous version (were talking over 10-15 years ago!), and I couldnt find that old version, only one slightly newer…
Worse, the only tool I had was debug.com to do it with… :( Well at any rate I poked the executable using the offsets of the original crack, which was as I expected different, but it showed me the code I was getting around.
The newer version had slightly different code. So instead of two groups of 4 NOPS,s I ended up with
5784 - 90 90 90 90
595C - 90 90 90 90
5717 - 90 90 90 90 90 90 90
58FA - 90 90 90 90
Three extra nops.
I ended up spending about two hours on de-nagging this ‘new’ version to run this app for about all of 5 minutes to check what I needed to check…
ohwell..
Filed Under : Computers • Development •
Tags:
(2) Comments
