RAT
ArrowRAT
It is available as a service, purchasable by anyone to use in their own campaigns.
ArrowRAT is a Windows rat.
Background
ArrowRAT is offered as a service that anyone can purchase for use in their own operations. Its capabilities are broadly what one expects from a RAT, the standout being an hVNC module that hands an attacker full remote access while requiring very little technical skill to operate.
Source: Malpedia (Fraunhofer FKIE).