Advanced Malware Analysis Training Session 5 - Reversing Automation

Advanced Malware Analysis Training Series

www.SecurityXploded.com

Disclaimer
The Content, Demonstration, Source Code and Programs presented here is "AS IS" without
any warranty or conditions of any kind. Also the views/ideas/knowledge expressed here are
solely of the trainer’s only and nothing to do with the company or the organization in which
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However in no circumstances neither the Trainer nor SecurityXploded is responsible for any
damage or loss caused due to use or misuse of the information presented here.


Acknowledgement
 Special thanks to Null community for their extended support and co-operation.

 Special thanks to ThoughtWorks for the beautiful venue.

 Thanks to all the trainers who have devoted their precious time and countless hours to make it
happen.


Advanced Malware Analysis Training

This presentation is part of our Advanced Malware Analysis Training program. Currently it
is delivered only during our local meets for FREE of cost.

For complete details of this course, visit our Security Training page.


Who am I?
Harsimran Walia
 Member, SecurityXploded
 Research Scientist, McAfee Labs
 Reversing, Malware Analysis, Exploit Analysis/Development etc.
 Personal site: http://harsimranwalia.info
 E-mail: walia.harsimran@gmail.com
 Twitter: b44nz0r


Content
 Automation
 Python scripts

 Use of modules

 Tools/Modules discussed
 PEfile

 PyDbg

 IDAPython


PEfile
 Python module to read and work with Portable Executable (PE) files

 pefile requires understanding of the layout of a PE file (already covered)

 Tasks that pefile makes possible are:
 Modifying and writing back to the PE image
 Header Inspection
 Sections analysis
 Retrieving data
 Warnings for suspicious and malformed values
 Packer detection with PEiD’s signatures


Pefile (hands-on)
 Load a PE (create an instance)

 Reading important PE header attributes

 Modifying values
All PE instance values support assignment followed by a call to write function to write the modified exe to system


Pefile (hands-on)
 PE sections – fetching detail about sections

Output
 File Info

Output


Pefile (hands-on)
 Type of file (exe/dll/driver)

 List of imported dlls and imported functions


Pydbg
 Open Source Python debugger

 Developed by Pedram Amini as the main component of PaiMei framework

 It uses user-defined callback functions

 These functions can implement actions to take on hitting a breakpoint, exception
etc

 Upon execution of the callback function the control is passed back to pydbg to
execute the program normally


Pydbg installation
 Download or git clone: https://github.com/OpenRCE/pydbg
 Pre-reqs
 Python 2.7
 c-types python library
 Copy the pydbg files to Python-2.7Libsite-packagespydbg
 pydasm.pyd is compiled for Python 2.6, lets fix this!
 Open pydasm.pyd in any hex-editor(010 etc) and search python
 Change python26.dll to python27.dll
 Save and replace with original


Pydbg (hands-on)
Import required pydbg modules and struct

Breakpoint handler for CreateFileA
Extract the parameter from the stack = filename

Breakpoint handler for CreateFileW

• Look for process to debug
• Attach debugger to process
• Set breakpoint on function entry address
• Attach a breakpoint handler


IDA Python
 An IDA Pro plugin

 Integrates Python, allowing scripts to run in IDA Pro

 IDAPython Scripts have access to
 IDA Plugin API,

 IDC and all modules available for Python


Installation
 Download the plugin from https://code.google.com/p/idapython

 Match the IDAPro and python version before downloading

 Copy the ''python'' directory from the extracted plugin to the IDA Pro install
directory (%IDADIR%)

 Copy the plugin executable to ''%IDADIR%plugins''


Hands-on
 Utility functions
 ScreenEA()
○ Obtains the address of where your cursor is currently positioned on the IDA screen.
 GetInputFileMD5()
○ Returns the MD5 hash of the binary loaded in IDA, which is useful for tracking changes in the binary

 Functions
 Functions( long StartAddress, long EndAddress )
○ Returns a list of all function start addresses contained between StartAddress and EndAddress.
 LocByName( string FunctionName )
○ Returns the address of a function based on its name.
 GetFunctionName( long Address )
○ Given an address, returns the name of the function the address belongs to.


Hands-on

 Try running on war-ftpd.exe


Demo..
 ExeScan

 http://www.securityxploded.com/exe-scan.php

 Malpimp

 http://www.securityxploded.com/malpimp.php


Reference
Complete Reference Guide for Advanced Malware Analysis Training
[Include links for all the Demos & Tools]


Thank You !



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