Mitreattack-python

Improvements

- Improved efficency of Excel generation capability

Fixes

- Patched core layer code to properly store 8-hex colors
- Patched core layer code to properly handle non-ascii characters when ingesting text
- Patched core layer code to properly initialize layers during instantiation
- Patched core layer code to properly support Metadata, MetaDiv, Link, LinkDiv instantiation
- Added storage support for transparency in gradient colors (rendering support will follow)
- Library now supports unicode characters in layers (UTF-16)

Fixes

- Patched core layer code to support minor changes in the 4.3 layer format

Improvements

- Added documentation regarding Release process
- Added documentation regarding Contributing
- Added standard test framework

Fixes

- Fixed tactic parsing in AttackToExcel so tactics are capitalized correctly in the output (Command and Control instead of Command And Control)
- Corrected minor mistakes in the README documentation of some cli scripts

Improvements

- Added support for multiple CAPEC IDs for a single technique in AttackToExcel
- Tweaked AttackToExcel permissions sorting
- Added parsing for all technique permissions in AttackToExcel
- Added support for [ATT&CK Layer format 4.3](https://github.com/mitre-attack/attack-navigator/blob/develop/layers/LAYERFORMATv4_3.md)

Improvements

- Added support for ATT&CK Workbench as a datasource
- Added parsing for CAPEC IDs in AttackToExcel
- Added support for data sources and data components when generating layers
- Added parsing for relationship references/citations in AttackToExcel