The Quantum ransomware, a strain first discovered in August 2021, were seen carrying out speedy attacks that escalate quickly, leaving defenders little time to react.

The threat actors are using the IcedID malware as one of their initial access vectors, which deploys Cobalt Strike for remote access and leads to data theft and encryption using Quantum Locker.

https://www.bleepingcomputer.com/news/security/quantum-ransomware-seen-deployed-in-rapid-network-attacks/