Cracking for Newbies  - by Dahood
                

Target: Mouse Trap Demo v 4.0

Tools used: W32dasm
	    Hview
	    

Protection:
1.time trail u have 10 time to try this program 


NOTE: This tutorial is not totally for newbies so i excpect that u know
1.how to use w32dasm
2.how to use hview (change,search,etc...)
3.Assembly



Disassemble the program 
and search for expire  and u should be here

:004015B1 83F80A                  cmp eax, 0000000A
:004015B4 A34CE14000              mov dword ptr [0040E14C], eax
:004015B9 7646                    jbe 00401601
:004015BB 8B0DECDF4000            mov ecx, dword ptr [0040DFEC]
:004015C1 6A14                    push 00000014

* Possible StringData Ref from Data Obj ->"Demo expired"
                                  |
:004015C3 6814D24000              push 0040D214

* Possible StringData Ref from Data Obj ->"Sorry! Your demo has expired. "
                                        ->"Please register Mouse Trap if "
                                        ->"you would like to continue using "
                                        ->"it. Would you like to register "
                                        ->"now?"

we know that 10 = A in hex   and we know what does this mean
u can try it out  open the program 10 time untill u get the expired nag then open hview and
change cmp eax, 0000000A----->10 times
to     cmp eax, 0000000F----->15 times

now open the program and we see that the nag is gone but after 5 more times it shows the nag
now we r going to try to ignore all that garbage and jmp to the real program.....


:004015B1 83F80A                  cmp eax, 0000000A    this compare 
:004015B4 A34CE14000              mov dword ptr [0040E14C], eax
:004015B9 7646                    jbe 00401601 and this jmps to u have % times left

jmps here

:00401601 50                      push eax
:00401602 8D542420                lea edx, dword ptr [esp+20]

* Possible StringData Ref from Data Obj ->"Thanks for trying Mouse Trap! "
                                        ->"You have used Mouse Trap %i time(s) "
                                        ->"out of the 10 allowed. Please "
                                        ->"register Mouse Trap if you like "
                                        ->"it!"



now all u have to do is make it jmp no matter if over 10 less 10
change  jbe 00401601
to      jmp 00401601

open h view  and change it 
now  u can open it as much as u want 

i hope i didnt confuse u and if u have any question, comments
my icq# is 69518421 or u can e mail me at webcrawler28@hotmail.com

i would like to say thanks to all the crackers 2 many 2 list , for helpin me also for there 
tutorials
also a big thanks to krobar's site http://zor.org/krobar
 
				Cracking for Newbies  - by Dahood