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TSRCrack V1.00 Copyright (c) 1993
by Wong Wing Kin
All rights reserved.
What is TSRCRACK?
This is a TSR utility for cracking software protection such as
password protection. It can also be used to modify the games so that
they can be much easier finished.
Why not modify the file directly? It is because the files are
often compressed and encoded, they cannot be decoded and modified.
Thus you need a TSR to modify the codes after the files are loaded
into memory.
This program can generate a TSR from given information about
where and how to modify the codes.
Input File format:
[program <startup program name> ]
int <which interrupt to hook>
<conditions>?
<conditions> :- if <segreg>:<seg offset>:<offset>:<codes>
(then <segreg>:<seg offset>:<offset>:<codes>)?
<segreg> :- ds | es | cs | ss
<seg offset> :- signed/unsigned hex numbers (word)
<offset> :- unsigned hex numbers (word)
<codes> :- space separated hex numbers (byte)
? means 1 or more occurrences.
[] mean optional.
Example: Crack INDARK password
program tatou.com
int 21
if cs:0000:25bc = 3b 86 d0 fd 75 28 a0 8e
then cs:0000:25c0 = eb 1a
The above program will hook int 21. Every time int 21 is called,
it will check the byte sequence at the address CS+0000:25bc
equal to 3b 86 d0 fd 75 28 a0 8e or not. If it is equal,
change CS+0000:25c0 to eb 1a.
Example: The following program can also be acceptable
Program tatou.com
int 21
if Cs:0000:25bc = 3b 86 d0 fd 75 28 a0 8e
then cs+0:+25c0 = eb 1a
if cs-cd6:1f46 = 8b 56 e6 d1 e2 c4 1e 8e 7d 03
then cs:-cd6:1f46 = 83 7e e6 15 74 8 f7 d8 eb d2
if cs:-cd6:1f04 = 26 ff 0f
then cs:-cd6:1f04 = eb 01
How to contact the author?
As I am now busy in my studies, I have no time to write a detail
document. If you find any problems in using this program, you can
contact the author through e-mail:
Internet address:
cs_wwkin@uxmail.ust.hk
Discliamer:
TSRCrack is supplied as is. The author disclaims all warranties,
expressed or implied, including, without limitation, the warranties
of merchantability and of fitness for any purpose. The author
assumes no liability for any damages, direct or consequential, which
may result from the use of, or inability to use TSRCrack.