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Azul Plugin Alphabets

Finds alphabet character runs for possible encoding schemes. Handles non-standard ordering of characters, as seen in some malware families.

Supported encodings:

  • base32
  • base64
  • base85

Development Installation​

To install azul-plugin-alphabets for development run the command (from the root directory of this project):

pip install -e .

Usage: azul-alphabet-finder​

Features found alphabets.

Usage on local files:

azul-alphabets test.exe

Example Output:

----- Alphabets results -----
OK

Output features:
        b64_alphabet: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
  b64_alphabet_count: 1

Feature key:
  b64_alphabet:  Possible base64 alphabet
  b64_alphabet_count:  Count of possible base64 alphabets

Automated usage in system:

azul-alphabet-finder --server http://azul-dispatcher.localnet/

Python Package management​

This python package is managed using a setup.py and pyproject.toml file.

Standardisation of installing and testing the python package is handled through tox. Tox commands include:

# Run all standard tox actions
tox
# Run linting only
tox -e style
# Run tests only
tox -e test

Dependency management​

Dependencies are managed in the requirements.txt, requirements_test.txt and debian.txt file.

The requirements files are the python package dependencies for normal use and specific ones for tests (e.g pytest, black, flake8 are test only dependencies).

The debian.txt file manages the debian dependencies that need to be installed on development systems and docker images.

Sometimes the debian.txt file is insufficient and in this case the Dockerfile may need to be modified directly to install complex dependencies.