FireEye Threat Intelligence - Mandiant's Advantage

Mandiant launched Mandiant Advantage last year; it's a Threat Intelligence, a SaaS-based platform designed for security response teams.

https://advantage.mandiant.com/

Mandiant Advantage Dashboard

Although it's a free subscription, you can see recent Malware trends and Threat Actor's activities. Also, it gives you to explore MITRE ATT&CK mapping with Actors or Malware.

It has restricted access if you don't have paid subscriptions, but I think it worth poking around and check the latest attack trends.

For example, a MITRE ATT&CK analysis for the SUNBURST breach is free to explore as below.