Remcos is a Remote Access Trojan (RAT) that allows attackers to gain unauthorized control over infected computers.
This RAT has been weaponized and commonly used in cybercriminal activities since its introduction in 2016.
Trellix researchers recently warned of weaponized Excel documents that were found delivering fileless Remcos RAT.
https://cybersecuritynews.com/beware-we ... emcos-rat/