[Matryoshka](https://attack.mitre.org/software/S0167) is a malware framework used by [CopyKittens](https://attack.mitre.org/groups/G0052) that consists of a dropper, loader, and RAT. It has multiple versions; v1 was seen in the wild from July 2016 until January 2017. v2 has fewer commands and other minor differences. (Citation: ClearSky Wilted Tulip July 2017) (Citation: CopyKittens Nov 2015)