From medium.com
We’re thrilled to announce that ATT&CK with sub-techniques is now live! This change has been a long time coming. Almost a year ago, we gave a first look at sub-techniques, and laid out our reasons for moving to them. This past March, based on feedback from that preview, we released a beta of ATT&CK with sub-techniques and now (with some small updates and fixes) it has become the current version of ATT&CK. You can find the new version of ATT&CK on our website, via the ATT&CK Navigator, as STIX, and via our TAXII server. Our “MITRE ATT&CK: Design and Philosophy” paper was also updated in March to reflect sub-techniques.