[Backdoor.Oldrea](https://attack.mitre.org/software/S0093) is a modular backdoor that used by [Dragonfly](https://attack.mitre.org/groups/G0035) against energy companies since at least 2013. [Backdoor.Oldrea](https://attack.mitre.org/software/S0093) was distributed via supply chain compromise, and included specialized modules to enumerate and map ICS-specific systems, processes, and protocols.(Citation: Symantec Dragonfly)(Citation: Gigamon Berserk Bear October 2021)(Citation: Symantec Dragonfly Sept 2017)