Language : Python
Platform : Windows
OS Version : All 
Packer / Protector : Pyarmor  + My Protector

Description :

Want to see if someone can unpack it, want to use this obfuscator for my future aplications in python

Screenshot : 

Spoiler

 

Download : 

Virustotal: https://www.virustotal.com/gui/file/fec987a11c8bdd47355529389d75f1f2cb0f980a763efa21e796dd1a21619989/detection
Download: https://anonfile.com/3fn5o8gdo5/UnpackME_by_0x72_rar

UnpackME by 0x72.rar

Edited March 8, 20205 yr by Teddy Rogers
Please use correct formatting and attach your file to the topic (do not use external file host)

The program is a 64 bit executable! (Portable Executable 64)
Did you code this UnpackMe yourself?
 

10 minutes ago, CodeExplorer said:

The program is a 64 bit executable! (Portable Executable 64)
Did you code this UnpackMe yourself?
 

Half of obfuscation is made manually and for the rest i used pyarmor

To make it Executable i used pyinstaller 

Edited March 7, 20205 yr by 0x72

Not necessary to unpack to get the key.

Key:

Spoiler

GENERATE-KEY-0X72GOD-UNPACKME

Converted it to run on Linux because it's easier to compile CPython on Linux and also because I don't have Visual Studio installed in the Windows VM.
This also explains why "title" and "cls" commands were not found.

Steps :

Spoiler

 

1. Use pyinstxtractor.py to extract the executable in Python 3.7

2. Using the extracted files, create the following directory structure

.
|-- martisor.pyc
`-- pytransform
    |-- __init__.py
    |-- _pytransform.dll
    |-- license.lic
    `-- pytransform.key

1 directory, 5 files

For running on Linux, you need _pytransform.so downloadable from https://pyarmor.dashingsoft.com/platforms.html

3. Install psutil using pip (Required for pyarmor). From now on, you can just run python3.7 martisor.pyc instead of the unpackme executable.

4. pyarmor encrypts the code objects on disk and they are only decrypted at runtime just before they are executed. The entire logic is implemented in _pytransform.dll. There are anti-debugging/timing checks to prevent us from using a debugger to dump code objects from memory. But there's no need to use a debugger at all when CPython itself is open source.

5. Compile Python 3.7 from source. Modify the _PyEval_EvalFrameDefault function such that it dumps the code object to disk. By doing so we do not need to bother about all the anti-debugging and encrypted stuff. This is because pyarmor decrypts the code object in memory before it hands it to the Python VM for execution.

6. Run strings on the dumped code  object. We get many base64 strings. Like this one: CkdFTkVSQVRFLUtFWS0wWDcyR09ELVVOUEFDS01FCg==

7. Base64 decode and profit!

 

 

5. Compile Python 3.7 from source. Modify the _PyEval_EvalFrameDefault function such that it dumps the code object to disk. By doing so we do not need to bother about all the anti-debugging and encrypted stuff. This is because pyarmor decrypts the code object in memory before it hands it to the Python VM for execution.

 

I don't understand this step at all

Edited April 19, 20205 yr by 0x72

On 3/29/2020 at 9:50 PM, Extreme Coders said:

5. Compile Python 3.7 from source. Modify the _PyEval_EvalFrameDefault function such that it dumps the code object to disk. By doing so we do not need to bother about all the anti-debugging and encrypted stuff. This is because pyarmor decrypts the code object in memory before it hands it to the Python VM for execution.

Hi Extreme, im trying to do this, but the code is unredable after dumped!

How you do it?

Which function you have used?

 

Thanks in advance :)

 

3 hours ago, Powante said:

Hi Extreme, im trying to do this, but the code is unredable after dumped!

The code will be unreadable as it's encrypted. But at least for this challenge that is not an issue. You can simply run strings on the dumped file.

I need to do the same, research for a string, but with "unredable" i means that the dumped code it is not binary.

I think i did not write the function for dumping correctly, do you have a sample or the function you have write for dumping?

 

Thank you very much! 

Edited May 18, 20205 yr by Powante

Thanks to "Extreme Coders", I've never programmed in python before, but after reading all your public material and following the recommended steps in this thread I've been able to desofuscate the code.
If they tell you how to do it you will understand it, but if they guide you and you have to discover how to do it you will learn

martisor_unpacked.py

On 3/29/2020 at 10:50 PM, Extreme Coders said:

5. Compile Python 3.7 from source. Modify the _PyEval_EvalFrameDefault function such that it dumps the code object to disk. By doing so we do not need to bother about all the anti-debugging and encrypted stuff. This is because pyarmor decrypts the code object in memory before it hands it to the Python VM for execution.

Quote

Modify the _PyEval_EvalFrameDefault function such that it dumps the code object to disk

do u mind explaining how to do that? how to dump the bytes from _PyEval_EvalFrameDefault

Edited June 29, 20205 yr by shadow.Walker

On 6/9/2020 at 3:22 PM, OdieWan said:

Thanks to "Extreme Coders", I've never programmed in python before, but after reading all your public material and following the recommended steps in this thread I've been able to desofuscate the code.
If they tell you how to do it you will understand it, but if they guide you and you have to discover how to do it you will learn

martisor_unpacked.py 10.3 kB · 12 downloads

Quote

def run_it():
    r"""
    /*
    An exception occurred when decompiling this method (06000001)

    ICSharpCode.Decompiler.DecompilerException: Error decompiling System.Void <Module>::.cctor()
    ---> System.OverflowException: Arithmetic operation resulted in an overflow.
    at ICSharpCode.Decompiler.ILAst.ILAstBuilder.StackSlot.ModifyStack(StackSlot[] stack, Int32 popCount, Int32 pushCount, ByteCode pushDefinition) in C:\projects\dnspy\Extensions\ILSpy.Decompiler\ICSharpCode.Decompiler\ICSharpCode.Decompiler\ILAst\ILAstBuilder.cs:line 47
    at ICSharpCode.Decompiler.ILAst.ILAstBuilder.StackAnalysis(MethodDef methodDef) in C:\projects\dnspy\Extensions\ILSpy.Decompiler\ICSharpCode.Decompiler\ICSharpCode.Decompiler\ILAst\ILAstBuilder.cs:line 387
    at ICSharpCode.Decompiler.ILAst.ILAstBuilder.Build(MethodDef methodDef, Boolean optimize, DecompilerContext context) in C:\projects\dnspy\Extensions\ILSpy.Decompiler\ICSharpCode.Decompiler\ICSharpCode.Decompiler\ILAst\ILAstBuilder.cs:line 269
    at ICSharpCode.Decompiler.Ast.AstMethodBodyBuilder.CreateMethodBody(IEnumerable`1 parameters, MethodDebugInfoBuilder& builder) in C:\projects\dnspy\Extensions\ILSpy.Decompiler\ICSharpCode.Decompiler\ICSharpCode.Decompiler\Ast\AstMethodBodyBuilder.cs:line 112
    at ICSharpCode.Decompiler.Ast.AstMethodBodyBuilder.CreateMethodBody(MethodDef methodDef, DecompilerContext context, AutoPropertyProvider autoPropertyProvider, IEnumerable`1 parameters, Boolean valueParameterIsKeyword, StringBuilder sb, MethodDebugInfoBuilder& stmtsBuilder) in C:\projects\dnspy\Extensions\ILSpy.Decompiler\ICSharpCode.Decompiler\ICSharpCode.Decompiler\Ast\AstMethodBodyBuilder.cs:line 88
    --- End of inner exception stack trace ---
    at ICSharpCode.Decompiler.Ast.AstMethodBodyBuilder.CreateMethodBody(MethodDef methodDef, DecompilerContext context, AutoPropertyProvider autoPropertyProvider, IEnumerable`1 parameters, Boolean valueParameterIsKeyword, StringBuilder sb, MethodDebugInfoBuilder& stmtsBuilder) in C:\projects\dnspy\Extensions\ILSpy.Decompiler\ICSharpCode.Decompiler\ICSharpCode.Decompiler\Ast\AstMethodBodyBuilder.cs:line 92
    at ICSharpCode.Decompiler.Ast.AstBuilder.<>c__DisplayClass89_1.<AddMethodBody>b__0() in C:\projects\dnspy\Extensions\ILSpy.Decompiler\ICSharpCode.Decompiler\ICSharpCode.Decompiler\Ast\AstBuilder.cs:line 1531
    */

    """
    pass

what Dnspy got to do with a python compiled program!! would u explain how u managed to modified the _PyEval_EvalFrameDefault function!

15 hours ago, shadow.Walker said:

do u mind explaining how to do that? how to dump the bytes from _PyEval_EvalFrameDefault

_PyEval_EvalFrameDefault executes a code object on the Python frame.
To dump the code object to a file you need to use PyMarshal_WriteObjectToFile / PyMarshal_WriteObjectToString at an appropriate place within the function.

 

15 hours ago, shadow.Walker said:

what Dnspy got to do with a python compiled program!! would u explain how u managed to modified the _PyEval_EvalFrameDefault function!

DnSpy has nothing to do with Python. It's just a piece of string inserted there on purpose.

Edited June 30, 20205 yr by Extreme Coders

@Extreme Coders would you be able to share your compiled python  #lazy

thanks!

@bytemangl3r I can but doubt that will be of any help since it's compiled for Linux and isn't a generic solution against Pyarmor i.e. won't work against the recent versions.

On 10/22/2020 at 4:19 AM, Extreme Coders said:

 I can but doubt that will be of any help since it's compiled for Linux and isn't a generic solution against Pyarmor i.e. won't work against the recent versions.

im on linux and it would be VERY helpfull if u could still send it

Edited November 24, 20204 yr by OliKing800

I also want to get unpack myself

On 6/9/2020 at 8:22 PM, OdieWan said:

Thanks to "Extreme Coders", I've never programmed in python before, but after reading all your public material and following the recommended steps in this thread I've been able to desofuscate the code.
If they tell you how to do it you will understand it, but if they guide you and you have to discover how to do it you will learn

martisor_unpacked.py 10.3 kB · 84 downloads

Perhaps a detailed explanation in performing this advanced operation would help fellow beginners like myself.

On 3/30/2020 at 2:50 AM, Extreme Coders said:

Not necessary to unpack to get the key.

Key:

  Hide contents

GENERATE-KEY-0X72GOD-UNPACKME

Converted it to run on Linux because it's easier to compile CPython on Linux and also because I don't have Visual Studio installed in the Windows VM.
This also explains why "title" and "cls" commands were not found.

Steps :

  Hide contents

 

1. Use pyinstxtractor.py to extract the executable in Python 3.7

2. Using the extracted files, create the following directory structure

.
|-- martisor.pyc
`-- pytransform
    |-- __init__.py
    |-- _pytransform.dll
    |-- license.lic
    `-- pytransform.key

1 directory, 5 files

For running on Linux, you need _pytransform.so downloadable from https://pyarmor.dashingsoft.com/platforms.html

3. Install psutil using pip (Required for pyarmor). From now on, you can just run python3.7 martisor.pyc instead of the unpackme executable.

4. pyarmor encrypts the code objects on disk and they are only decrypted at runtime just before they are executed. The entire logic is implemented in _pytransform.dll. There are anti-debugging/timing checks to prevent us from using a debugger to dump code objects from memory. But there's no need to use a debugger at all when CPython itself is open source.

5. Compile Python 3.7 from source. Modify the _PyEval_EvalFrameDefault function such that it dumps the code object to disk. By doing so we do not need to bother about all the anti-debugging and encrypted stuff. This is because pyarmor decrypts the code object in memory before it hands it to the Python VM for execution.

6. Run strings on the dumped code  object. We get many base64 strings. Like this one: CkdFTkVSQVRFLUtFWS0wWDcyR09ELVVOUEFDS01FCg==

7. Base64 decode and profit!

 

 

@Extreme Coders I couldn't found any __init__.py file after extracting? Please help me.

@Dzung __init__.pyc is the same file as PYZ-00.pyz_extracted/pytransform.pyc after renaming it. Here I've further decompiled the pyc to py but that's not strictly necessary.

6 hours ago, Extreme Coders said:

@Dzung __init__.pyc is the same file as PYZ-00.pyz_extracted/pytransform.pyc after renaming it. Here I've further decompiled the pyc to py but that's not strictly necessary.

I got it. Thank you!

On 6/30/2020 at 2:18 PM, Extreme Coders said:

_PyEval_EvalFrameDefault executes a code object on the Python frame.
To dump the code object to a file you need to use PyMarshal_WriteObjectToFile / PyMarshal_WriteObjectToString at an appropriate place within the function.

 

DnSpy has nothing to do with Python. It's just a piece of string inserted there on purpose.

Hello

I try to use your idea,but I have two problems.

I use 

 PyMarshal_WriteObjectToFile

to dump, and this param have FILE, so I do not know how to get this FILE struct. I try to use fopen

Unfortunately, the gcc give me some error

And the last problem:

If I dump multiple script files, how to ensure that they will not be overwritten.

Please forgive me for the bad English. thanks for your help.

1. C is case-sensitive. FILE should be in uppercase.
2. PyMarshal_WriteObjectToFile is defined in marshal.h. The header has to be #include 'd before
3. To prevent overwriting, you can fopen in append mode, or make the filename a number and increase that sequentially on each call.

 

On 5/15/2021 at 1:02 PM, Extreme Coders said:

1. C is case-sensitive. FILE should be in uppercase.
2. PyMarshal_WriteObjectToFile is defined in marshal.h. The header has to be #include 'd before
3. To prevent overwriting, you can fopen in append mode, or make the filename a number and increase that sequentially on each call.

 

Hi! I followed your guide, and edited the file in the following way:

...
/* Start of code */

    /* push frame */
    if (Py_EnterRecursiveCall(""))
        return NULL;

    tstate->frame = f;
    FILE *dump_file = NULL;
    dump_file = fopen("./dump.log", "ab");
    PyMarshal_WriteObjectToFile((PyObject *) f, dump_file, 2);
    fclose(dump_file);

    if (tstate->use_tracing) {
...

 

However, when I execute the code and read the dump file, there are only '?' in them:

????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

Am I missing something?

Edited May 17, 20214 yr by uchiha_indra

On 5/15/2021 at 3:32 PM, Extreme Coders said:

1. C is case-sensitive. FILE should be in uppercase.
2. PyMarshal_WriteObjectToFile is defined in marshal.h. The header has to be #include 'd before
3. To prevent overwriting, you can fopen in append mode, or make the filename a number and increase that sequentially on each call.

 

Thanks for your help.

I include marshal.h first, but the compiler give me more error. I google this that let me know repeated inclusion. The error follow below:

So, I think it can not include directly. I do not know how to do.... 

Thank you again.

I just add 

extern PyAPI_FUNC(void) PyMarshal_WriteObjectToFile(PyObject *, FILE *, int);

at ceval.c 's header. It can compile. It's amazing!