MalwareHunterTeam has been tracking the samples of the Parallax RAT as they have been submitted through VirusTotal and other malware submissions services. The malware is being sold on hacker forums where developers are promoting the software and offering support. The developers also claim that their software can bypass Windows Defender, Avast, AVG, Avira, Eset, and BitDefender, which is not true based on these detections. The best defense against this malware is to be wary of unsolicited emails that contain unsolicited attachments.
Source: https://www.bleepingcomputer.com/news/security/parallax-rat-common-malware-payload-after-hacker-forums-promotion/