▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
█ █
█ "*" DumpExe version 2.5 "*" █
█ █
█ by ▄─▄ ▄ ▄─▄ ▄─▄ ▄─▄ ▄─▄ ▄ ▄─▄ ▄─▄ █
█ █ █ █─▄ ▀─▄ █─ ▀─▄ ▀─▄ ▄ █ █ █ █ █
█ █ █ █ █ ▄ █ █ ▄ █ ▄ █ █ █ █ █ █ █
█ ▀▀▀ ▀▀▀ ▀▀▀ ▀▀▀ ▀▀▀ ▀▀▀ ▀ ▀▀▀ ▀ ▀ 1998 █
█ █
█────────────────────────────────────────────────────────────────────────────█
█ Handle Real name Age Profession E-Mail address Group activity █
█────────────────────────────────────────────────────────────────────────────█
█ Bugsy Benjamin Petersen 25 Programmer _bugsy@usa.net Coder, organizer █
█ Hendrix Patrick Enoch 22 Study Math _hendrix@usa.net Coder, unpackers █
█ Spawn Michael Skovslund 24 Programmer _spawn@usa.net Coder, gfx █
█ Icicle Henrik Eiriksson 25 Study IFA _icicle@usa.net Music, art █
█────────────────────────────────────────────────────────────────────────────█
█ █
█ PLEASE CHECK OUT OUR INTERNET HOMEPAGE AT : home.t-online.de/home/enoch █
█ █
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INDEX
History (New information, please take a look)
Introduction
Disclaimer
Keyboard layout
Program documentation
Configuration
SoftICE user notice (New information, please take a look)
GameTools user notice
EatMem utility
How to unpack an exefile
How to get in touch with us (New information, please take a look)
Distribution sites
Greetings (New information, please take a look)
■ History
Version Release Note
1.0 Never released to the public, only for our beta-testers (Darkman)
1.1 First public release
1.2 Now with SoftICE debugger support. Activate via INT FCh
2.0 Autodump from TD, S-ICE and GAMETOOLS. Detects a lot of things.
Uses UMB. Added Total Memory Dump feature, Show User Screen. Now it
swaps dos-stack so DumpExe can be activated at any time (re-entrant)
2.1 Fixed a bug in dos version check. (Damn)
2.2 Added support for overlay as requested by José Navarro Martínez
Fixed minor bugs in DumpExe. Added mail registration form
Added a utility called EATMEM that allocates 4 KB from within DOS.
Removed the WORD version of this doc file (Did anybody use it ?).
2.3 Added a configuration file. Added "Fastmode" in file 2.
Now you can choose between a rasterbar and a textmode bar.
Added the auto-fill from SoftICE as promised in v2.0, phew.
The PSP validation function have now 3 ways to demind if PSP
is valid. Added userdefined SoftICE/DumpExe interrupt. Now the
user can change the stacksize that DumpExe uses. Changed some
colors. Added a function that alows the user to specifye SoftICE
backdoor values. Added support for Turbo Debugger 4.x and 5.0.
SoftICE is now, by default, activated via INT 4C
2.5 DumpExe under SoftICE is now, by default, activated via INT 32.
Fixed a bug in MakeExe that caused it to be ONE relocation short.
Added an API interface to DumpExe, so you can make unpackers
yourself without to much trouble. Added an unpacker (UNPACKER.EXE)
and the source code for it to show how DumpExe API works. It can
unpack PKLite'ed files. Added suport for SoftICE version 3, under
windows 95
2.5 Now with Pentium safe code with Borland patch for runtime error 200
■ Introduction
This program is able to unpack ANY packed exefile. Many other programs,
such as cup, up, tron, unp and vgacbust give you the same ability. But those
programs can only expand/unpack files packed with known exepackers. By
using the OBSESSiON DumpExe toolpack, you can unpack any of those exefiles
that the above utilities give up on. Of course this can't be done by inserting
a quarter (kr.) into the crypt-o-mate. We have to do a little more than this.
This is where you, the OBSESSiON DumpExe toolpack, and your debugger come
into the picture.
All you have to do is this :
Load the exeprogram into your favourite debugger (eg. TD, S-ice, GameTools)
Debug the program until first original (unpacked) instruction
Dump the code/data, using the DumpExe program, via the FILE 1 option
Terminate the loaded program
Allocate a 4 Kb memory block via the DumpExe program (or use EATMEM.EXE)
Reload the program, and ensure that the entry point is different
Debug the program until first original (unpacked) instruction
Dump the code/data, using the DumpExe program, via the FILE 2 option
Terminate the loaded program
Deallocate the 4 Kb memory block via the DumpExe program (or use EATMEM.EXE)
Run MAKEEXE with the needed parameters.
Example : MAKEEXE.EXE ORIGINAL.EXE NEWFILE.EXE
And 'puf', your done.
To technically understand how this can be done, please refer to selection :
"How to unpack an exefile".
If this sounds easy, exit your doc reader now, if not, keep on reading. 8-)
■ Disclaimer
This software has been tested and found to work properly. OBSESSiON have no
responsbility whatsoever for any damages caused by use, or misuse of this
software.
IF YOU DISAGREE WITH ANY OF THOSE TERMS, PLEASE REMOVE THIS SOFTWARE NOW.
If you, after a 24 hour test period, still wish to continue using this
software, you NEED to send us a postcard with your name and address or
register at our homepage at HTTP://home.t-online.de/home/enoch. The reason is
that it's the ONLY way I can explain to my wife why I have invested MORE than
300 hours developing this software. This is the only way I can see that
someone is really using this software. If I don't receive anything by mail,
I won't update the program any more.
This means :
IF NOT (ReceivedAnyPostCardOrEMail) THEN
HALT (Programmer)
ELSE
ReleaseNextVersion
■ Keyboard layout
Left shift + right shift : Activate the resident part of DumpExe
TAB : Jump to next menu block
Shift TAB : Jump to previous menu block
Arrow up/down : Next/previous menu selection/block
Arrow left/right : Next/previous digit or menu block
ESC : Terminate DumpExe or return to previous state
Enter : Confirm selection/input
■ Program documentation
Install DumpExe into memory by starting the file DumpExe.EXE. The program
will now go resident (TSR) in memory. This means that it can be envoked at
any time and within any dos program (such as a debugger).If UMB is available,
the 'DOS stack' and 'Screen swap data' will be placed here. To activate
DumpExe, please press "LEFT SHIFT" and "RIGHT SHIFT" at the same time (also
called the hotkey). A menu like the one shown below, should appear. To return
to interrupted program, press "ESC".
NOTICE : In versions 1.2 you couldn't start DumpExe by pressing the
hotkey within the dos command line (InDOS). This has now been
fixed by using the technique called 'DOS stack switching'.
FIG 1. The main picture of DumpExe
┌────── DumpExe v2.5 CARDWARE 1998 by BUGSY/OBSESSiON ──[1]─┐
│ Dos, ≥80386, V86 mode, Turbo Debugger [2] │
│───────── First file ────[3]─┬───────── Second file ───[4]─│
│ CS : 0000 │ CS : 0000 │
│ IP : 0000 │ IP : 0000 │
│ SS : 0000 │ SS : 0000 │
│ SP : 0000 │ SP : 0000 │
│ PSP : 0000 │ PSP : 0000 │
│ Size : 00000 (0) │ Size : 00000 (0) │
│ Name : #NoName#.1 │ Name : #NoName#.2 │
│─────────────────────────[5]─┼─────────────────────────[6]─│
│ Dump exe-code │ Dump exe-code │
│ Autodetect name │ Autodetect name │
│ Autodetect size │ Autodetect size │
│─────────────────────────[7]─┼─────────────────────────[8]─│
│ Configuration │ User screen │
│ Memory snapshot │ Allocate 4Kb │
│ Reset menu │ Auto config file 2 │
│ Uninstall │ Fill from debugger │
│─────────────────────────────┴─ Free 99 kb, Slack 0 kb [9]─│
│ [10] │
└───────────────── Hotkey : (U)ser screen ──────────────────┘
Overview
[1] Copyright text.
[2] Information on the operating system and found debuggers.
[3] Data for first memory dump, set by the user.
[4] -"- for second memory dump.
[5] Menu concerning first memory dump.
[6] -"- for second memory dump.
[7] General purpose menu, concerning global use of DumpExe.
[8] Utility menu with functions, helps you get the job done faster.
[9] Information about the current memory status.
[10] Shows status messages from DumpExe and serves as an input prompt.
Explenation
[1] Copyright text.
Tells who made this brilliant program.
[2] Information on the operating system and found debuggers.
Shows if current session is a DOS, WINDOWS or OS/2 session.
Also shows which debuggers have been found active at the present
moment.
Can show a mixture of the following text strings :
[8086, 80286, ≥80386],
[Real mode, V86 mode],
[Dos, Win Std, Win Enh, OS/2],
[No debugger, Turbo Debugger, SoftICE, GameTools]
Example : Dos, ≥80386, Real mode, SoftICE, GameTools
As you can see, it is possible to have more than one debugger loaded
at the same time. This can be usefull when combining Turbo Debugger
and GameTools.
[3] Data for first memory dump, set by the user.
This subwindow is used to enter information about the program you
want to unpack. You have to fill out ALL fields to get a working
copy of the unpacked program.
CS : Current code segment
IP : Current instruction pointer
SS : Current stack segment
SP : Current stack pointer
PSP : Current program prefix segment, usually the same as ES
Size : Size of program in bytes
Name : Name of dump file
To change a value, move the selector to the decided item and press
"ENTER". Enter the new value and press "ENTER" again.
REMARK : All numbers are shown and entered in hexadecimal values.
The filename can not be entered manuelly.
[4] -"- for second memory dump. ([3])
[5] Menu concerning first memory dump.
It is used for dumping the code/data block entered in [3] or [4].
Menu items available are :
Dump exe-code : Select this one to dump selected code/data block.
Autodetect name : Let DumpExe autodetect the name of the program
its processing, and use it as the dump filename.
Autodetect size : Let DumpExe autodetect the size of the code/data
block. There are two ways to autodetect this
size. It can be done by Stack or by PSP. The
most common way is 'By Stack', because this
usually gives a smaller, and more accurate image
of the original unpacked exefile.
[6] -"- for second memory dump. ([5])
[7] General purpose menu, concerning the global use of DumpExe.
Menu items available are :
Configuration : Use it to configure how DumpExe reacts in
different situations. See "Configuration"
Memory snapshot : Takes a snapshot of the first megabyte of memory,
and puts it in a file in the current directory;
called SNAPSHOT.MEM. Use it for whatever you may
like.
Reset menu : Sets all items to their initial value. Use it if
something, somehow goes bananas.
Uninstall : Removes the DumpExe software from the memory.
Use it if you want to remove the DumpExe from
memory.
[8] Utility menu with functions that helps you get the job done faster.
Menu items available are :
User screen : Shows the screen as it was before DumpExe was
started. Use this function instead of pressing
"ESC" and then the hotkey. This function can
also be called by pressing "U" while in view
mode.
(De)Allocate 4Kb : Used to allocate/deallocate a block of 0100h
paragraphs (4 Kb). This should be done after
the first dump and termination, and before you
reload the program. Please take a look at the
tutorial later in this document.
NOTICE : This function can ONLY be used within
Turbo Debugger and GameTools. So if
you are using SoftICE, please use
the utility called EATMEM.EXE instead.
Auto-Config : Adds 0101h to all segment registers in [2] and
store them in [3]. It is useful after
preparing for second dump. This works only on
9 out 10 packed files. Please notice that CS
in [3] matches the one shown by the debugger.
If not, enter all values manually. You only
have to use this function if
"Fill from debugger" fails.
Fill from debugger : Read the register shown by the debugger and
automatically place the values into first or
second dumpfile. This is a VERY useful
function, since it gives you the ability to
unpack the exefile FAST.
[9] Information about the current memory status.
Free : Amount of free basememory, in Kb.
Slack : Number of memory fragments in Kb, after allocating 4 Kb.
[10] Status messages from DumpExe and input prompt.
This line serves as an error message and input scratch.
Here are some of the error messages that can appear :
No size given.
You have to enter how much memory the program needs to dump.
No memory allocated.
You are trying to auto-config file 2, and you haven't used
"allocate 4KB". You must manually enter the data required to dump
Can't auto-config file 2, sorry.
You have to manually, enter the data required to dump a program.
Or you could use the function : "Fill from debugger"
The PSP-segment is not valid.
You are using a function that requires a valid PSP segment,
entered in [3] or [4].
The PSP-segment for file 1 is not valid.
See the above.
Can't find name.
DumpExe is not able to find the name of the program you want
to dump. The program is using a standard name instead.
Can't uninstall, vector hooked by another program.
You have loaded another program after DumpExe. Unfortunately the
two programs have both hooked onto the same interrupt. Unload the
other program first and try again.
Can't allocate necessary memory.
Boot your machine with fewer drivers, and try again. If this
doesn't help, you are f.....
Out of stack.
Your memory is fragmented too much. By default DumpExe has a 4 Kb
stack and in this case it doesn't seem to be enough. Make it bigger
in the config
Can't release memory.
This error is most likely caused by the program you are about to
dump, or the stack of this program has been destroyed. Dump the
code and boot your PC. (the dumpfile should be okay, I hope...)
Can't make file.
Oops, a disk error. Check your harddisk with "chkdsk /f" or
"scandisk"
Can't write file, disk full ?.
Free some disk space, and try again.
Can't deallocate memory.
The MCB (memory control block) has been destroyed. Dump the code
and don't think more about it. (again, the dumpfile should be okay,
I hope...)
■ Configuration
Below is a picture of the configuration menu :
┌────── DumpExe Configuration ──[1]─┐
│ Rasterbar : AUTO │
│ Fast mode : ON │
│ PSP validation level : MEDIUM │
│ SoftICE SI value : 4647h │
│ SoftICE DI value : 4A4Dh │
│───────────────────────────────[2]─│
│ Activate via interrupt : 32h │
│ DumpExe stack size : 1000h │
│───────────────────────────────[3]─│
│ Reset to default values │
│───────────────────────────────[4]─│
│ │
└───────────────────────────────────┘
With this menu you can control how DumpExe reacts in different situations.
When you change a value, it will be saved to the binary file DumpExe.CFG.
If you change values in [1] it will affect the behavior of DumpExe instantly,
and if you change the values in [2], you have to reload DumpExe in order to
let them affect DumpExe.
Overview
[1] User parameters
[2] System parameters
[3] Reset the configuration to default values.
[4] Shows status messages from DumpExe.
Explenation
[1] User parameters
Menu items available are :
Rasterbar : When you activate this selection,
you switch between a rasterbar, and a
textmodebar. The difference between them
are that rasterbar looks nice, but are
slow and uses alot of processor time.
Textmodebar look ugly, but are fast and
uses almost no processor time. You can
cycle between OFF/ON/AUTO. In automode
DumpExe will determine if it should use
a raster- or textmodebar. It chooses
rasterbar in dos mode and textmodebar
while running under windows.
Fast mode : Fast mode is for people in a hurry. The
registeres in File 2 follows File 1. Well
at least IP, SP, size and name does. When
you enter the PSP in File 2, DumpExe will
calculate the rest of the values for you.
"Fast mode" can be set to ON or OFF. If
you choose OFF mode, DumpExe reacts like
it did in previous versions, and you have
to enter all informations by yourself (or
use the "Fill from debugger" selection).
PSP validation level : When DumpExe is detecting the name or the
the size of the program you are unpacking,
it uses the programs PSP. So in order to
do that, it need to know if the PSP is
valid or not. DumpExe performs 3 checks to
do that. When you activate this selection
it cycles between NONE/SOFT/MEDIUM/HARD.
In NONE mode no check is performed. In
SOFT mode, one out of three PSP checks must
be true. In MEDIUM mode, two out of three
PSP checks must be true. In HARD mode three
out of three PSP checks must be true, in
order to continue calculations. Some
packers change part of the static PSP data
to confuse unpackers, and therefor we
advice you to use MEDIUM or SOFT mode.
SoftICE SI value : When DumpExe trys to detect SoftICE, it
needs the so called backdoor values. These
values are always the same if you are
using the original version from Nu-Mega.
But if you are using a patched version,
DumpExe cannot demind if SoftICE is
installed or not without the new backdoor
values. So if you are using a patched
version, enter the values here and in
selection below.
SoftICE DI value : See "SoftICE SI value"
[2] System parameters
Menu items available are :
Activate via interrupt : Since SoftICE for Windows doesn't support
all interrupts (using the GENINT command)
you have the ability to choose one for
yourself. Please be sure that the
interrupt you have chosen isn't used.
Just to be clear : You cannot choose
INT 09h, 21h or FBh, and guess why not !
So if you are using SoftICE for windows
choose one below 5Fh.
DumpExe stack size : When you allocate a 4 kb memory block
DumpExe uses a lot of stack, and if you
get the error message "Out of stack",
try to increase this value by 800h. But
it is my guess that you will NEVER see
this error message, well at least I havn't
[3] Reset configuration to default values.
Resets the values in the configuration to there default values,
nothing more, nothing less.
[4] Shows status messages from DumpExe.
Read the above line ;-)
■ SoftICE user notice
NOTICE : In DumpExe version 2.3, Int 4ch was used to activate DumpExe,
please use Int 32h. If this doesn't work try another value ;-)
This is ONLY for SoftIce version 3 (under Win95) !
If you are using SoftIce for DOS, Int FCh and Int 4Ch are also ok.
If you are using SoftICE, the hotkey is disabled. This is because SoftICE
runs in protected mode and uses its own interrupt vector table. To activate
DumpExe, enter the following sequence at the SoftICE command line prompt :
BPX CS:IP : So we can return after INT 032h has terminated
GENINT 32 : Start the exe-dumper
GENINT 32 : Start the exe-dumper again (if you need it)
BC 0 : Clear the breakpoint set by BPX. The number (in this case
0) is the name of the breakpoint label.
Don't start DumpExe unless you are are at the very first instruction of
the unpacked exefile because your current location might be in the keyboard
handler or equal.
NOTICE : You cannot use the DumpExe menu called 'Allocate 4Kb' within
SoftICE. This function can ONLY be used within Turbo Debugger
and GameTools. Please use the utility called EATMEM.EXE insted.
(Look at selection 'EatMem utility' later)
NOTICE : In version 2.2 and below the SoftICE/DumpExe interrupt was FCh,
but since SoftICE for Windows can't handle interrupts above 5Fh
we changed the default value. But if you have any problem using
32h please send me a mail and choose an other in the Configuration
menu.
■ GameTools user notice
DumpExe only support GameTools version 3.40 properly.
If you are using GameTools, be SURE to load DumpExe BEFORE you load
GameTools. If you don't, you can't activate DumpExe within GameTools.
■ EatMem utility
EatMem is a program that from within dos allows you to allocate
a 4 KB memory block.
When you start EATMEM.EXE the first time it starts DumpExe (if resident) and
allocates a 4 KB memory block. The next time you start EATMEM.EXE it will
free the 4 KB memory block.
Use this utility if you can't allocate a 4 KB memory block within DumpExe.
So insted of using the menu (in DumpExe) 'Allocate 4 KB', just return to dos,
and run EATMEM.EXE. When you are finished with the second dump, just run
EATMEM.EXE again, or release the 4 KB memory block via DumpExe.
■ How to unpack an exefile
The file named TESTEXE.EXE is a packed exefile. It is used to illustrate
how to use this tool, and nothing more. The file is packed with pklite
version 2.01 using normal compression.
I will use Turbo Debugger for this example, because if you know how to use
the ultimate debugger SoftICE, you probably don't need this introduction
anyway, do you ?
If you don't know anything about using a debugger, I advise you to consult
your debuggers manual.
Try to execute the tutorial program TESTEXE.EXE and look at the text it
displays. The program will tell you if it's packed or not.
REMEMBER : Start DumpExe.EXE before proceeding with the next step.
Start debugging TESTEXE.EXE by writing : TD.EXE TESTEXE.EXE
The picture shown, by TD (Turbo Debugger), should look something like
this :
╔═[■]═CPU 80486═══════════════════════════════════════╤═══════1═[�][�]═╗
║ cs:0100�50 push ax � ax 0000 │c=0║
║ cs:0101 B83106 mov ax,0631 ■ bx 0000 │z=0║
║ cs:0104 BA8501 mov dx,0185 ▒ cx 0000 │s=0║
║ cs:0107 054C84 add ax,844C ▒ dx 0000 │o=0║
║ cs:010A 3B060200 cmp ax,[0002] ▒ si 0000 │p=0║
║ cs:010E 722A jb 013A ▒ di 0000 │a=0║
║ cs:0110 B409 mov ah,09 ▒ bp 0000 │i=1║
║ cs:0112 BA1C01 mov dx,011C ▒ sp 0200 │d=0║
║ cs:0115 CD21 int 21 ▒ ds 843C │ ║
║ cs:0117 B8014C mov ax,4C01 ▒ es 843C │ ║
║ cs:011A CD21 int 21 ▒ ss 85F7 │ ║
║ cs:011C 4E dec si ▒ cs 843C │ ║
║ cs:011D 6F outsw ▒ ip 0100 │ ║
║ cs:011E 7420 je 0140 ▒ │ ║
║ cs:0120 656E outsb gs: � │ ║
╟�■▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒�┼────────────┴───╢
║ ds:0000 CD 20 A7 8A 00 9A C0 00 ═ ºè Ü└ │ ss:0208 2020 ║
║ ds:0008 00 00 E4 01 32 4B AE 01 Σ�2K«� │ ss:0206 2020 ║
║ ds:0010 32 4B 80 02 8D 45 FB 36 2KÇ�ìE√6 │ ss:0204 2020 ║
║ ds:0018 01 01 01 00 02 FF FF FF ��� � │ ss:0202 2020 ║
║ ds:0020 FF FF FF FF FF FF FF FF │ ss:0200�3130 ║
╚═════════════════════════════════════════════════════╧═══════════════─┘
NOTICE : Due to the nature of the PC-memory, the segment registers
(CS, DS, ES, SS) might show different values than the one
shown.
Start executing the code until cs:0153, by pressing "F4" at location cs:0153,
shown below. (Press "PAGEDOWN" 2 or 3 times)
╔═[■]═CPU 80486═══════════════════════════════════════╤═══════1═[�][�]═╗
║ cs:0147 B9C500 mov cx,00C5 � ax 8A44 │c=0║
║ cs:014A 33FF xor di,di ■ bx 0000 │z=1║
║ cs:014C 57 push di ▒ cx 0000 │s=0║
║ cs:014D BE5401 mov si,0154 ▒ dx 0185 │o=0║
║ cs:0150 FC cld ▒ si 02DE │p=1║
║ cs:0151 F3A5 rep movsw ▒ di 018A │a=0║
║ cs:0153�CB retf ▒ bp 0000 │i=1║
║ cs:0154 FD std ▒ sp 01FA │d=0║
║ cs:0155 8CDB mov bx,ds ▒ ds 843C │ ║
║ cs:0157 53 push bx ▒ es 8A44 │ ║
║ cs:0158 83C32E add bx,002E ▒ ss 8A5D │ ║
║ cs:015B 90 nop ▒ cs 843C │ ║
║ cs:015C 03DA add bx,dx ▒ ip 0153 │ ║
║ cs:015E 8CCD mov bp,cs ▒ │ ║
║ cs:0160 8BC2 mov ax,dx � │ ║
╟�■▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒�┼────────────┴───╢
║ ds:0000 CD 20 A7 8A 00 9A C0 00 ═ ºè Ü└ │ ss:0202 0004 ║
║ ds:0008 00 00 E4 01 32 4B AE 01 Σ�2K«� │ ss:0200 0000 ║
║ ds:0010 32 4B 80 02 8D 45 FB 36 2KÇ�ìE√6 │ ss:01FE 0000 ║
║ ds:0018 01 01 01 00 02 FF FF FF ��� � │ ss:01FC 8A44 ║
║ ds:0020 FF FF FF FF FF FF FF FF │ ss:01FA�0000 ║
╚═════════════════════════════════════════════════════╧═══════════════─┘
The unpacker has copied itself to a location, which is just after the
(not yet) unpacked code location. Singlestep one instruction ("F7"), and
you'll hopefully see this :
╔═[■]═CPU 80486═══════════════════════════════════════╤═══════1═[�][�]═╗
║ cs:0000�FD std � ax 8A44 │c=0║
║ cs:0001 8CDB mov bx,ds ■ bx 0000 │z=1║
║ cs:0003 53 push bx ▒ cx 0000 │s=0║
║ cs:0004 83C32E add bx,002E ▒ dx 0185 │o=0║
║ cs:0007 90 nop ▒ si 02DE │p=1║
║ cs:0008 03DA add bx,dx ▒ di 018A │a=0║
║ cs:000A 8CCD mov bp,cs ▒ bp 0000 │i=1║
║ cs:000C 8BC2 mov ax,dx ▒ sp 01FE │d=0║
║ cs:000E 80E40F and ah,0F ▒ ds 843C │ ║
║ cs:0011 B104 mov cl,04 ▒ es 8A44 │ ║
║ cs:0013 8BF2 mov si,dx ▒ ss 8A5D │ ║
║ cs:0015 D3E6 shl si,cl ▒ cs 8A44 │ ║
║ cs:0017 8BCE mov cx,si ▒ ip 0000 │ ║
║ cs:0019 D1E9 shr cx,1 ▒ │ ║
║ cs:001B 4E dec si � │ ║
╟�■▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒�┼────────────┴───╢
║ ds:0000 CD 20 A7 8A 00 9A C0 00 ═ ºè Ü└ │ ss:0206 0002 ║
║ ds:0008 00 00 E4 01 32 4B AE 01 Σ�2K«� │ ss:0204 0003 ║
║ ds:0010 32 4B 80 02 8D 45 FB 36 2KÇ�ìE√6 │ ss:0202 0004 ║
║ ds:0018 01 01 01 00 02 FF FF FF ��� � │ ss:0200 0000 ║
║ ds:0020 FF FF FF FF FF FF FF FF │ ss:01FE�0000 ║
╚═════════════════════════════════════════════════════╧═══════════════─┘
Press "F4" at location cs:0161 (the retf instruction), found by pressing
"PageDown" 13 - 14 times; and then "F7". That's it. You have now unpacked
the TESTEXE program. If you have done it right, TD shows something like this :
╔═[■]═CPU 80486═══════════════════════════════════════╤═══════1═[�][�]═╗
║ cs:0117�9A00005985 call 8559:0000 � ax 0000 │c=0║
║ cs:011C 9A0D00F784 call 84F7:000D ■ bx 0000 │z=1║
║ cs:0121 9A97077B84 call 847B:0797 ▒ cx 0000 │s=0║
║ cs:0126 55 push bp ▒ dx 0000 │o=0║
║ cs:0127 89E5 mov bp,sp ▒ si 0000 │p=1║
║ cs:0129 B80001 mov ax,0100 ▒ di 0000 │a=0║
║ cs:012C 9ACD025985 call 8559:02CD ▒ bp 0000 │i=1║
║ cs:0131 81EC0001 sub sp,0100 ▒ sp 4000 │d=0║
║ cs:0135 9ACC01F784 call 84F7:01CC ▒ ds 843C │ ║
║ cs:013A BFB800 mov di,00B8 ▒ es 843C │ ║
║ cs:013D 1E push ds ▒ ss 868D │ ║
║ cs:013E 57 push di ▒ cs 844C │ ║
║ cs:013F 8DBE00FF lea di,[bp-0100] ▒ ip 0117 │ ║
║ cs:0143 16 push ss ▒ │ ║
║ cs:0144 57 push di � │ ║
╟�■▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒�┼────────────┴───╢
║ ds:0000 CD 20 A7 8A 00 9A C0 00 ═ ºè Ü└ │ ss:4008 0000 ║
║ ds:0008 00 00 E4 01 32 4B AE 01 Σ�2K«� │ ss:4006 0001 ║
║ ds:0010 32 4B 80 02 8D 45 FB 36 2KÇ�ìE√6 │ ss:4004 0002 ║
║ ds:0018 01 01 01 00 02 FF FF FF ��� � │ ss:4002 0001 ║
║ ds:0020 FF FF FF FF FF FF FF FF │ ss:4000�0002 ║
╚═════════════════════════════════════════════════════╧═══════════════─┘
As you can see there are three far calls. These are direct calls. This means
that it will make a call to a certain location in memory. If we dump the
memory used by TESTEXE, we'll have an image of the program. But this is not
enough to make a new exefile. This is because an exefile is not just an image
of the memory, unlike COM files. We need a second dump from a different
memory location. This is because of the direct calls. By comparing the two
dumps, we can find the relocations (direct calls) needed to build a new
exefile. Information like min/max memory usage is taken from the original
exefiles header, but let's get on with the tutorial.
There are serval ways to enter the values of SP, DS, ES, SS, CS and IP into
DumpExe. Since we are using one of the supported debuggers, we can use
the "Fill from debugger" function. This function takes register values, shown
by the debugger, and automatically puts them into DumpExe. Start DumpExe
by pressing the hotkey, and then "ENTER" at the "Fill from debugger"
function. Answer "1" to whatever the values should be places in first or
second dump file. Another way is to remember the values of SP, DS, ES, SS,
CS and IP before pressing the hotkey, and enter the values at their
corresponding locations in [2]. If you decide to do so, you will probably
notice that there is no field for ES. This is because the initial value of
ES, points to the PSP, so write the value of ES in the PSP field instead.
It's now time to tell DumpExe the size of the memory block we want to dump.
Use TAB until you get to [4]. Press "ENTER" at "Autodetect size". There are
two ways of getting the size of the program. One is by using the stack, the
other is by using PSP. 99 % of all cases, you should use "by stack". Press
"S", and the size will be put into size field. If DumpExe somehow fails to
calculate the right value, you have the option of entering a size that you
decide. Press "ENTER" at "Autodetect name", and the name of the executeable
file will be put into the name field. The last thing we have to do is to
dump the program to a file. This is done by pressing "ENTER" at
"Dump exe-code". DumpExe will probably do it so fast that you won't notice
the "process message" that appears.
Below is a picture of DumpExe after the first dump. Again, remember that
values vary from dump to dump.
┌────── DumpExe v2.5 CARDWARE 1998 by BUGSY/OBSESSiON ──────┐
│ Dos, ≥80386, Real mode, Turbo Debugger, Soft-Ice │
│───────── First file ────────┬───────── Second file ───────│
│ CS : 844C │ CS : 0000 │
│ IP : 0117 │ IP : 0000 │
│ SS : 868D │ SS : 0000 │
│ SP : 4000 │ SP : 0000 │
│ PSP : 843C │ PSP : 0000 │
│ Size : 02410 (9232) │ Size : 02410 (9232) │
│ Name : TESTEXE.1 │ Name : TESTEXE.2 │
│─────────────────────────────┼─────────────────────────────│
│ Dump exe-code │ Dump exe-code │
│ Autodetect name │ Autodetect name │
│ Autodetect size │ Autodetect size │
│─────────────────────────────┼─────────────────────────────│
│ Configuration │ User screen │
│ Memory snapshot │ Allocate 4Kb │
│ Reset menu │ Auto config file 2 │
│ Uninstall │ Fill from debugger │
│─────────────────────────────┴─ Free 75 kb, Slack 0 kb ────│
│ │
└───────────────── Hotkey : (U)ser screen───────────────────┘
Press "ESC" (in DumpExe) and then "F9" in TD. The program has now terminated,
and it's time to allocate a 4KB memory block.
Start DumpExe again, and press enter at "Allocate 4Kb". The menu item will
change to "Deallocate 4Kb". Press "ESC", and reload the program by pressing
"CTRL F2". Start debugging like you did the first time. When you have reached
the first instruction of the original code, enter all the information, like CS,
SS.... in [3]. Autodetect size and name. Dump the code, and we are almost
done. Again terminate your program, by pressing "F9" in TD. Start DumpExe
again, and press "ENTER" at 'Deallocate 4Kb'. Exit your debugger.
Run the MAKEEXE program with parameters : TESTEXE.EXE UNPACKED.EXE
or like this : MAKEEXE.EXE TEXTEXE.EXE UNPACKED.EXE
The MAKEEXE program compares the two memory dump and builds a new exefile
out of the information found there and in the original exefiles header.
After MAKEEXE has built the new exefile, the screen should look like this :
┌─────────────────────────────────────────────────────────┐
│ ─┼── MakeExe v2.5 CARDWARE 1998 by BUGSY/OBSESSiON ─┼── │
│ │
│ │
│Unpacking TESTEXE.EXE into UNPACKED.EXE │
│ │
│■ Read dump info │
│■ Read exe info │
│■ Create new file │
│■ Create tempfile │
│■ Write relocations │
│■ Write zero data │
│■ Write code │
│■ Write new header │
│■ Number of relocations 00C2h │
│ │
│All done! │
│ │
└─────────────────────────────────────────────────────────┘
Try to execute UNPACKED.EXE (it is now unpacked) and see how it reacts.
I think this would be enough for you to continue on your own.
■ How to get in touch with us
If you have any questions about the use of these programs, feel free to
contact us.
You can get in touch with us by :
Writing a letter to : Benjamin Petersen
Skovburren 271
4700 Naestved
Denmark
E-Mail us at : _bugsy@usa.net
World Wide Web (WWW) : http://home.t-online.de/home/enoch
■ Distribution sites
BBS Name : Final Fantasy BBS
Contact : Mr. Zenix Yang (Mr. Yang Shiuh-Phong)
Address : 11F-2, No. 107-3,
Chung-Yung Road,
Taichung, Taiwan,
Republica Of China
BBS/Fax : +886 4 - 383 1006
Voice : +886 4 - 384 8298
Email : zenix@ms10.hinet.net
BBS Name : SelF Destruction BBS
Contact : BloOD aNGeL
Address : France
BBS : +33.01-69893603 (near Paris) (remove the zero after +33 ??)
Email : bloodang@club-internet.fr
You can always find the newest version at :
www.simtel.net/pub/simtelnet/msdos/execomp/dmpexe??.zip
or
ftp.simtel.net/pub/simtelnet/msdos/execomp/dmpexe??.zip
Where ?? is the version number without the dot. Eg. dmpexe23.zip
■ Greetings
Our greetings goes to (A-Z order) :
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Have fun, and remember there are still some people who DON'T take money
for making _good_ programs.
[BUGSY/OBSESSiON]