Multidecoder

Multidecoder is a python library and command line tool for extracting indicators of compromise (IOCs) from a file. Multidecoder preserves the context of where and how an IOC is found to allow automated detection of patterns of obfuscation. Multidecoder is currently in alpha, and may change in ways that breaks backwards compatibility as developement continues.

Indicators of compromise extracted by Multidecoder:

• network IOCS: urls, domains, emails, ip addressses
• executable filenames
• embedded PowerShell
• embedded PE files
• a customizable set of keywords

Deobfuscations and decodings supported:

• base64 encoding
• hexadecimal encoding
• string concatenation
• powershell escape characters

Installing

Multidecoder can be installed from pypi using pip:

pip install -U multidecoder

Alternatly, it can also be installed from the repository:

pip install -U https://github.com/CybercentreCanada/Multidecoder/archive/main.zip

To test the latest development version, install from the dev branch:

pip install -U https://github.com/CybercenterCanada/Multidecoder/archive/dev.zip

Command Line

After being installed Multidecoder can be run on a file from the command-line

> multidecoder file

which will output a list of indicators found. Indicators are printed one per line, with a string representation of the context of the indicator followed by the indicator.

The raw json result can be output with the --json flag

> multidecoder --json file

if no filename is given multidecoder takes its standard input as the file to be scanned.

Python library

Multidecoder can be used as a python library through the Multidecoder class, which can scan data to give a dictionary tree similar to the command-line json output.

from multidecoder.multidecoder import Multidecoder

md = Multidecoder()
context_tree = md.scan(data)