A new ransomware group is said to have emerged in mid-April 2024, under the name 'APT73.' It's worth noting that the group reportedly self-proclaimed as an APT, which stands for 'Advanced Persistent Threat' in the cybersecurity field.

According to research, much of the available information about the aforementioned group came from another ransomware group known as LockBit.
Source: https://github.com/crocodyli/ThreatActors-TTPs