[Remcos](https://attack.mitre.org/software/S0332) is a closed-source tool that is marketed as a remote control and surveillance software by a company called Breaking Security. [Remcos](https://attack.mitre.org/software/S0332) has been observed being used in malware campaigns.(Citation: Riskiq Remcos Jan 2018)(Citation: Talos Remcos Aug 2018)