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Old 03-23-2004, 16:32
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Cool 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?
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Old 03-24-2004, 02:01
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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,
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Old 04-22-2004, 21:34
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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.
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Old 04-23-2004, 23:42
JMI JMI is offline
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This did not start out as a "Tutorial" and does not belong in that Forum, so I've moved it here.

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Old 04-24-2004, 14:40
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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
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.
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Old 04-28-2004, 17:02
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no body sharing dos cracking-art tuts now?

who can manual upacking for dos?
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Old 05-22-2004, 06:09
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??? 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
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Old 05-24-2004, 17:28
redbull redbull is offline
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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.


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