## Tuesday, 11 July 2017

### Deobfuscating PjOrion using bytecode simplifier

Bytecode simplifier is a tool to de-obfuscate PjOrion protected python scripts. This post is a short tutorial to show how to use this module to deobfuscate a protected python script.

I have used the sample code below to demonstrate its usage. This is a small program to calculate the factorial of a number.

``````# Python program to find the factorial of a number using recursion

def recur_factorial(n):
"""Function to return the factorial
of a number using recursion"""
if n == 1:
return n
else:
return n*recur_factorial(n-1)

# take input from the user
num = int(input("Enter a number: "))

# check is the number is negative
if num < 0:
print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
print("The factorial of 0 is 1")
else:
print("The factorial of",num,"is",recur_factorial(num))
``````

## Monday, 10 July 2017

### Introducing bytecode simplifier

Bytecode simplifier is a tool to deobfuscate PjOrion protected python scripts. It is a complete rewrite of my earlier tool PjOrion Deobfuscator. I have reimplemented the deobfuscation functionality from scratch and have used networkx specifically for this purpose. Using networkx made reasoning about the code much simpler.
The PjOrion version used is 1.3.2 (Filename: PjOrion_Uncompyle6_01.10.2016.zip)

The code is at https://github.com/extremecoders-re/bytecode_simplifier

A short tutorial can be found here: https://0xec.blogspot.com/2017/07/deobfuscating-pjorion-using-bytecode.html