TL; DR: A open-source post-compromise C2 framework.
Type: C2 framework
Targeted Operating Systems: MacOS, Windows, and Linux
Interesting characteristics: Open source (https://github.com/BishopFox/sliver)
Threat tag: win.sliver
Reporting: https://malpedia.caad.fkie.fraunhofer.de/details/win.sliver
TTPs: https://attack.mitre.org/software/S0633/