DeCV 1.0b By p_k (Decompiler for Code Virtualizer 1.3.8)

[Pertic@n]

DeCV 1.0b

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- What is it

- Usage

- Possible problems

About

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DeCV is a decompiler for files protected with Code Virtualizer v1.3.8.0 by

Oreans Technologies (www.oreans.com).

It's able to devirtualize macro-protected code back to a stack language used

by CV. If anyone is interested enough to write a CVL -> x86 converter, take

a look at recover_x86.py -- it it's not hard to extend this code to handle

more opcodes, but it's quite a bit of work.

Usage

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DeCV was tested on IDA 6.2.x with IDAPython.

To use, open the file you want to deprotect and load decv.py script and wait.

DeCV will automatically perform all tasks.

Possible problems

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DeCV relies on IDA to correctly disassemble code. If you encounter problems

during the handler parsing (basic block creation), manifested in errors like:

- outside handler: *address*

- Problem with getting mnemonic @ *address*

they are most likely caused by incorrect disasm generated by IDA.

To fix, go to the address you see in the error message. If you see garbage

instructions or data mixed with code (DB xxh), undefine whole block by

pressing 'u', and then directly convert to code, by pressing 'c'. Resulting

code should be cleaner and should not have garbage instructions, or DB xxh

stuff in it.

p_k

gdtr.wordpress.com

twitter.com/pa_kt

more info And Ref:

http://gdtr.wordpres...izer-by-oreans/

Sources:

https://github.com/pakt/decv

Typical decompilation output:

http://pastebin.com/etzbaUhB

Regards

[mudlord]

As expected, ged_ delivered the goods. Superb work.