Microsoft office document exploit kit contains a variety of recent exploits and Malware such as Lokibot, Formbook and tracking kit called such as ThreadKit. These Exploits kits are available in restricted underground crime forums and the cybercriminals are selling them at a different price. They are used to spread malware payloads such as Trickbot and Chthonic, and RATs like FormBook and Loki Bot. ThreadKit is a relatively new and popular document exploit builder kit that has been used in the wild since at least June 2017.”]
Source: https://gbhackers.com/microsoft-office-document-exploit-kit/