RAT
jRAT
aka Jacksbot
jRAT, also known as Jacksbot, is a RAT with history, written in Java.
jRAT, also known as Jacksbot, is a Java rat.
Background
jRAT, also called Jacksbot, is a long-standing Java-based remote access trojan. It runs on macOS, Linux, Windows, and several BSD variants, and includes capabilities for taking part in DDoS attacks and committing click fraud. It is worth noting that the Adwind family is frequently mislabeled as jRAT due to a misleading reference to jrat.io.
Source: Malpedia (Fraunhofer FKIE).