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-   -   How to unpack DOS program working in protected mode? (https://forum.exetools.com/showthread.php?t=3721)

rootra 03-23-2004 16:32

How to unpack DOS program working in protected mode?
 
Hello, I've got a problem with unpacking a program running in protected mode. I have no experience with such DOS programs, and don't know what debugger and dumper to use.
File analyze showed that the program was packed by LZEXE 1.0, but unpackers couldn't unpack it correctly. File size even decreased from 210kb to 10kb.

So what you suggest me to do?

least 03-24-2004 02:01

Hi,
you say the program is running in protected mode. Does it mean that the unpacking isdone in PM too? If this is the case then I think you are in trouble. If not, try CUP386 it can unpack almost any packer, or try tr2.52 (both can be found on www.exetools.com, on the top of the page, under unpackers and debuggers). If all fails, you'll have to do it manualy, probably by dumping in softice and then rebuilding the whole exe (god save you:)
Good luck,
least

ladidi 04-22-2004 21:34

Run it in a VDM
 
You can lauch it in a VDM under wind*ws and dump it.
Try with WinHex oy SIce.
Best regards.

JMI 04-23-2004 23:42

This did not start out as a "Tutorial" and does not belong in that Forum, so I've moved it here.

Regards,

zuoquan 04-24-2004 14:40

A DOS program working in protected mode?
 
What is a DOS program working in protected mode?
A, a program started in real mode, then make the machine into protected mode and then work
or
B, a DOS-Extend program generated by DOS/4GW or other SDKs

if B, the program file structure is much like NE or PE format. It has a stub running in real mode and real codes running in protected mode. The stub often search for the DOS-Extend program such as dos4gw.exe, the DOS/4GW Protected Mode Run-time, load it, and instruct it to load your program to execute.

peterchen 04-28-2004 17:02

no body sharing dos cracking-art tuts now?
 
who can manual upacking for dos?

freddy2002 05-22-2004 06:09

??? me confused ???
last time i did something on dos was MDK (the dos game (long ago))
installed softice on W9X, replaced explorer.exe with command.com
in system.ini, fire up the game and cracked the cd protection

redbull 05-24-2004 17:28

hmmm ..... Amazing how you can take it for granted that there are people out there who have had no DOS experience.

LZExe is a very easy tool to unpack ...

Snow Panthers "Unpack" should be able to handle this with no problem.

hxxp://reversing.kulichki.com/files/unpack/unpack23.rar

If you want to manually unpack this file use TR.EXE (Tracer 2.01 and above)


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