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Creating variants in a snap

hexfiles issue 1

eZine's profile picture
Published in 
hexfiles
 · 31 Oct 2022

CREATE VARIANTS WITHOUT REALLY TRYING

Believe me not but it is really true. You can create variants of your virii with hardly an effort on your part. This is a lamer's delight and it is for you, my dear lamer and the rest of your kind out there, that made me do this article.

As you well know, a difference in the length of virii means that it is a different variant. (ex.: Diamond.606, Diamond.607) If virii of the same length have differences between them, then they are minor variants of that virii. (ex.: Cascade.1701.A, Cascade.1701.B). Let's wait and see how the AVs react to this. But if they recognize patched virii as minor variants, what more with what we are going to do. But first, here's how to do it.

Part 1. Create variants without rewriting your code

When writing your virii, use standard assembly language mnemonics and directives and you will go through this without a fuzz. Using compiler specific mnemonics and will give you headaches when you do the following procedures:


Use different compilers

Not all compilers use the same opcode set when assembling your source code. *TASM* and *MASM* uses the same opcode set but most often the program created are not identical. The difference lies in the insertion of NOPs. MASM is wont to do this but TASM behaves well and produces a more tightly packed program. *A86* use an entirely separate opcode set and is identical to that used by DEBUG.


Use different versions of a compiler

Compiler upgrade sometimes comes changes in the opcode sets used or new optimization method. Assembling your source code in different versions of a compiler might produce changes in length of your virii or a byte or two will differ.

Do a binary compare of your virii variants of the same length to be certain that you have created a new variant. DOS' FC.EXE will do just fine for this purpose. (FC /b file1 file2)

Note though that some versions of a compiler might require you to fix portions of your source code before it can compile it.

Part 2: Minor alteration of your source code required

Use simplified and classic segment directives. Difference in length occurs if you use directly addressed memory operands. In the simplified segment directives, these memory operands are automatically given a CS segment override. In the classic segment directives, the compiler uses the segment specified in the ASSUME statement. The change in length will depend on how many directly addressed memory operands are in your source code.

You might encounter phase errors when you compile your codes. In the case of Duwende, I did not make an effort to fix these. In compiled using simplified directives, a 413 to 415 byte variant can be created.

This is only applicable up to verion 5.xx of MASM.

Part 3: Disassembly required

I mentioned in Part 1 that A86 and DEBUG uses the same opcode set. However, they don't exactly create identical programs all the time. Sometimes a byte or more differ. So why not try using it.

Get one first generation of your virii, one for each length variant. Disassemble it in DEBUG. Remember that you are disassembling the first generation og *YOUR OWN VIRUS*. If you could not tell which part is data and which is code, forget it. This was not intended for brainless fools like you. Create a script file of your disassembly. Use "DB" or "E" command only for the data protions of your virii. Use assembly mnemonics for the code part. Assemble your script file in DEBUG in DEBUG.

Do a binary compare if you really created a new varaint.


-o-


The following are the product of my little experiment:

  =============  ============  ============================================== 
variant listing compiler/remarks
============= ============ ==============================================
Duwende.409.A dwnd409a.scr tasm 2.01 (compiled from source)
Duwende.409.B dwnd409b.scr masm 6.00 (compiled from source)
Duwende.409.C dwnd409c.scr a86 4.02 (compiled from source)
Duwende.409.D dwnd409d.scr a86 2.16 (compiled from fixed source)
Duwende.409.E dwnd409e.scr disassembled Duwende.409.A recompiled in debug

Duwende.410.A dwnd410a.scr masm 5.00 (compiled from source) 1 nop inserted
Duwende.410.B dwnd410b.scr disassembled Duwende.410.A recompiled in debug
31 bytes differs with Duwende.410.A
============= ============ ==============================================

Differences in Bytes of Duwende.409 Minor Variants

                    409.A   409.B   409.C   409.D   409.E   Remarks 
~~~~~ ~~~~~ ~~~~~ ~~~~~ ~~~~~ ~~~~~~~
Duwende.409.A - 2 18 27 31 tasm 2.01
Duwende.409.B 2 - 20 29 33 masm 6.0
Duwende.409.C 18 20 - 9 13 a86 4.02
Duwende.409.D 27 29 9 - 4 a86 2.16
Duwende.409.E 31 33 13 4 - debug msdos 6.22

To create an executable program,

  • cut the desired debug script. leave everything intact starting from "xxxxxxxx.scr starts here" and "xxxxxxxx.scr ends here" and save the file as xxxxxxxx.scr.
  • type

debug < xxxxxxx.scr

and press the enter key


Replace xxxxxxx.scr with the actual name of the debug script, for example dwnd409a.scr. An infected com program will be created.

This is a file infected by the Duwende virus. This is for your research on virii. What specifically is your research is none of my business, but you alone (means not PsK nor HEX-FILES nor anybody else but YOU YOu You you) is responsible for your actions.

ok doki bok.


-<{([Putoksa Kawayan]|:)}>-

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RCX
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-- DWND409A.SCR ENDS HERE ------------------------------------------



-- DWND409B.SCR STARTS HERE ----------------------------------------

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E 0460 B4 3E CD 21 C3 BA 03 01

RCX
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-- DWND409B.SCR ENDS HERE ------------------------------------------



-- DWND409C.SCR STARTS HERE ----------------------------------------

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RCX
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-- DWND409C.SCR ENDS HERE ------------------------------------------



-- DWND409D.SCR STARTS HERE ----------------------------------------

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E 0450 4C 16 8B D0 24 1F 80 E1 E0 08 C1 B8 01 57 CD 21
E 0460 B4 3E CD 21 C3 BA 03 01

RCX
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-- DWND409E.SCR STARTS HERE ----------------------------------------

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