Malware
Sheriff
According to IBM X-Force, this is a modular backdoor that was used for targeting the defense sector of Ukraine.
Sheriff is a Windows malware family.
Background
IBM X-Force reports that this is a modular backdoor deployed against Ukraine's defense sector. It leverages the Dropbox API for both C2 and data exfiltration.
Source: Malpedia (Fraunhofer FKIE).