[Green Lambert](https://attack.mitre.org/software/S0690) is a modular backdoor that security researchers assess has been used by an advanced threat group referred to as Longhorn and The Lamberts. First reported in 2017, the Windows variant of [Green Lambert](https://attack.mitre.org/software/S0690) may have been used as early as 2008; a macOS version was uploaded to a multiscanner service in September 2014.(Citation: Kaspersky Lamberts Toolkit April 2017)(Citation: Objective See Green Lambert for OSX Oct 2021)