yaoyi2008 / pindemonium

A pintool in order to unpack malware

PINdemonium

An unpacker for windows executables exploiting the capabilities of PIN.

Dependencies

• PIN

• Scylla

• Visual studio 2010

Installation

1. Download the linked version of PIN

2. Unzip PIN to the root directory and rename the folder to pin

3. Clone this repository

4. Extract the archive in PINdemonium/ScyllaDependencies/diStorm.rar into PINdemonium/Scylla/

5. Extract the archive in PINdemonium/ScyllaDependencies/tinyxml.rar into PINdemonium/Scylla/

6. Extract the archive in PINdemonium/ScyllaDependencies/WTL.rar into PINdemonium/Scylla/

7. Open the file PinUnpacker.sln with Visual Studio 2010 ( NB: The version is mandatory )

8. Create a folder C:\pin and copy the folders PINdemonium\PINdemoniumDependencies and PINdemonium\PINdemoniumResults in C:\pin\

9. Be sure that you are compiling in Release mode

10. Be sure that all the module inside the project are compiled using the platform toolset v100 ( you can see this with right click on the module -> Properties -> platform toolset field )

11. Compile the solution

12. Optional : Create a folder called PINdemoniumPlugins in C:\pin\

	\---C
	    \---pin
			   \+---source
			   	| 	     
			   	|
			   	|
			   \+---PINdemoniumResults
			   	|
			   	|
			   	|
			   	|
			   \+---PINdemoniumDependencies 
			   	|						  
			   	|			              	\---config.json
			   	|					\---Yara
			   	|								\--yara_rules.yar
			   	|								\--rules
			   	|					\---Scylla
			   	|								\---ScyllaDLLRelease
			   	|									\---ScyllaDLLx86.dll
			   	|								\---ScyllaDLLDebug
			   	|									\---ScyllaDLLx86.dll
			   	|								\---ScyllaDumper.exe
			   	|
			   	|
			   	|
			   \+---PINdemoniumPlugins
			   	|
			   	|
			   	|
			   	|
			   \+---PINdemonium.dll

Usage

1. Run this command from the directory C:\pin\

   pin -t PINdemonium.dll [-flags] -- <path_to_the_exe_to_be_instrumented>
   

   Flags :

   • -iwae <number_of_jump_to_dump> : specify if you want or not to track the inter_write_set analysis dumps and how many jump

   • -poly-patch: if the binary you are analyzing has some kind of polymorphic behavior this activate the patch in order to avoid pin to execute the wrong trace.

   • -plugin <name_of_the_plugin>: specify if you want to call a custom plugin if the IAT-fix fails (more information on in the Plugin system section).

2. Check your result in C:\pin\PINdemoniumResults\< current_date_and_time >\

Plugin System

PINdemonium provides a plugin system in order to extend the functionalities of the IAT fixing module.

To write your own plugin you have to:

1. Copy the sample project called PINdemoniumPluginTemplate located in PINdemonium\PINdemoniumPlugins\ wherever you want.

2. Change the name of the project with a name of your choice

3. Implement the function runPlugin

4. Compile the project

5. Copy the compiled Dll in C:\pin\PINdemoniumPlugins

6. Launch PINdemonium with the flag plugin active followed by your plugin name (EX : -plugin PINdemoniumStolenAPIPlugin.dll)

Inside the template two helper function are provided:

• readMemoryFromProcess : this function reads the memory from the specified process, at the specified address and copies the read bytes into a buffer

• writeMemoryToProcess : this function writes the bytes contained inside a specified buffer into the process memory starting from a specified address

Yara Rules

Every time a dump is taken yara is invoked and the rules contained inside C:\pin\PINdemoniumDependencies\Yara\yara_rules.yar are checked. The current rule comes from https://github.com/Yara-Rules/rules: - rules\evasion_packer : Try to identify antiVM/antiDebug techniques and the presence of a known packer - rules\malware: Try to identify the malware family of the unpacked stage

Config

Config file located at C:\pin\PINdemoniumDependencies\config.json contains variables which allow to set the location of the outputs

Results

Results are located at C:\pin\PINdemoniumResults\< current_date_and_time >\ and contains:

• report_PINdemonium: Json file which contains the most important information about the unpacking process;
• log_PINdemonium.txt: Log which contains useful debugging information

Report Structure

{  
	//Array containing information for each dump
   "dumps":[             
      {  
         "eip":4220719,         	 //EIP where the dump was taken     
         "start_address":4220439,	 //start address of the Write-set block
         "end_address":4221043,		 //end address of the Write-set block
         "heuristics":[
            {	
            	//Yara Rules Heuristic
               "matched_rules":["ASProtectv12AlexeySolodovnikovh1"],
                "name":"YaraRulesHeuristic",
                "result":true
            },
            {  
            	//Long Jump Heuristic
               "length":1801,					
               "name":"LongJumpHeuristic",
               "prev_ip":4218918,
               "result":true
            },
            {  
            	//Entropy Heuristic
               "current_entropy":5.7026081085205078,    
               "difference_entropy_percentage":0.0014407391427084804,
               "name":"EntropyHeuristic",
               "result":false
            },
            {  
            	//Jump Outer Section Heuristic
               "current_section":".data",			
               "name":"JumpOuterSectionHeuristic",
               "prev_section":".data",
               "result":false
            }
         ],
         "imports":[  
			//.... Imported functions....
         ],
         "intra_writeset":false,
         "number":0,
         "reconstructed_imports":0
       
      },
   ]
}

Thanks

This work has been possible thanks to:

1. NtQuery/Scylla

2. Yara-Rules/rules

3. VirusTotal/yara