Malware
DropBook
DropBook is a backdoor developed by the Molerats group and first appeared in late 2020.
DropBook is a Windows malware family operated by Molerats.
Background
DropBook is a backdoor built by the Molerats group that surfaced in late 2020. It abuses Facebook and Dropbox for C2, with operators driving the backdoor by posting commands to fraudulent Facebook accounts.
Source: Malpedia (Fraunhofer FKIE).