Azul Plugin Script Decoder

Plugin for decrypting scripts encoded with Microsoft's screnc.exe tool.

These can be standalone encoded jscript or vbscript (.jse/.vbe extensions respectively), or embedded within HTML script tags.

Development Installation

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

pip install -e .

Usage

Usage on local files:

azul-plugin-script-decoder malware.file

Example Output:

----- ScriptDecoder results -----
OK

Output features:
  tag: encoded_script

Feature key:
  tag:  Any informational label about the sample

Generated child entities (1):
  {'action': 'decoded', 'offset': '0x30', 'language': 'jscript'} <binary: bbc6275f157e997b85916664916bc87e816a7cebb729f56e02a0b2b5e5fb1615>
    content: 516943 bytes

Automated usage in system:

azul-plugin-script-decoder --server http://azul-dispatcher.localnet/

Python Package management

This python package is managed using a 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 pyproject.toml and debian.txt file.

Version pinning is achieved using the uv.lock file.

To add new dependencies it's recommended to use uv with the command uv add <new-package> or for a dev package uv add --dev <new-dev-package>

The tool used for linting and managing styling is ruff and it is configured via pyproject.toml

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.