Malware
Keyhole
According to Walmart Global Tech, Keyhole is a multi-functional VNC/Backconnect component used extensively by IcedID/Anubis.
Keyhole is a Windows malware family.
Background
Walmart Global Tech describes Keyhole as a versatile VNC/Backconnect module heavily relied upon by IcedID/Anubis. Although some of its features match the typical VNC and HDESK behavior documented in prior reporting, much of the additional functionality it now includes has received little public technical coverage.
Source: Malpedia (Fraunhofer FKIE).