Cheat Engine

slippppppppp · Posted: Mon Nov 12, 2007 5:14 pm Post subject: CrackMe

I think this is the most advanced crackme ive made. Just post a username and a working serial and you win xP!

Edit
Btw, you cannot input char's in your serial

If you are really good, write a working keygen me for this, and ill have your name in my sig :]

Edit, added fixed version.

zart · Posted: Mon Nov 12, 2007 6:42 pm Post subject:

you obviously havn't tested this.

fix it and we'll keygen it

slippppppppp · Posted: Mon Nov 12, 2007 6:47 pm Post subject:

anywho anyone still trying? Shocked

zart · Posted: Mon Nov 12, 2007 7:11 pm Post subject:

step one of making a program

test it

step two

fix bugs

step three

TEST that your bugs are fixed.

fix it again, and if it isn't fixed the last time i won't bother looking again

edit: right now your comparing an address of a pointer to a value. you need to be comparing the value the pointer points to, to the value.

haha01haha01 · Posted: Tue Nov 13, 2007 6:34 am Post subject:

its not a crackme, its a debugme, change the topic title NAO.
and besides it looks like a realy easy 1 if it was working...
its cmp jnz crackme... sooooo lame.

Flyte · Posted: Tue Nov 13, 2007 8:53 am Post subject:

atom0s · Posted: Tue Nov 13, 2007 9:05 am Post subject:

Still has issues, enter an invalid name and serial and it crashes instead of displaying an invalid key string or just closing. You need to test a bit more before releasing.

The compare / jump after the check of the key being valid or not never gets reached either:

oib111 · Posted: Tue Nov 13, 2007 9:30 am Post subject:

haha01haha01 · Posted: Tue Nov 13, 2007 9:33 am Post subject:

hey hey, i cracked more then half of the crackmes on this forum, and im almost sure i posted on 99% of the topics on crackmes forum. i can crack crackmes, find their passowrd, sometime even keygen them, but i do NOT debug crackmes. thats the DEVELOPER's job.

Symbol · Posted: Tue Nov 13, 2007 10:09 am Post subject:

Doesn't work, crashs when I write my serial... (Symbol, #I=2?<)

haha01haha01 · Posted: Tue Nov 13, 2007 10:24 am Post subject:

ye, we alredy know that.

actually, the program jumps to "raiseexception" on its own decision....
step in the calls and ull reach an obvious invoking of "RaiseException"
it looks like the program was meant to crash..........

killersamurai · Posted: Tue Nov 13, 2007 12:32 pm Post subject:

user: killersamurai
pass: 0x3db2cdb8

So far, this only works when loaded through olly. When I try it without loading it into olly, it doesn't work for me. Also, it will always show the invalid message because of cmp ebx, dword ptr ds:[40a7b4], which holds the value of 148662h. If you enter 0x00000000 for the serial, it will not show either message.

zart · Posted: Tue Nov 13, 2007 4:33 pm Post subject:

God - how does every topic turn into spam like this?

Yes, it's already posted that there are bugs in this, yes he's already been yelled at for it. Christ - we don't need 10 people spewing the same thing, go raise your post count some where else.

Since he hasn't fixed it since I last posted - and no one else has bother to look into it more I'll explain whats going on;

Takes the username and subtracts each letter by 0x10

ZART = J1BD = 0x
name - hash

Takes the serial and converts it to hex;

1234 = 4D2

Then it loads in the constant 0x148662

Then it xor's the hex version of the serial (4D2) and see's if they are equal;

compares (0x4D2^0x148662) to 0x4A314244 and then says it's valid if equal, if not does bad boy jump.

Thats how the compare statement should be, though he currently has the value's wrong.

I know it's coded in delphi, but it's easier to explain the bug in terms of cpp. He is comparing the address of a pointer to a value... Not a value a pointer is pointing to and a value...

Essentially the bug is like the following;

int *x = 4;
int y = 4;

if(x==y)
cout << "win";