Malware
Hook
According to ThreatFabric, this is a malware family based on apk.ermac.
Hook is a Android malware family.
Background
ThreatFabric identifies this as a malware family derived from apk.ermac. The "Hook" name is the branding promoted by its seller, DukeEugene. It communicates over WebSocket and includes remote access trojan functionality.
Source: Malpedia (Fraunhofer FKIE).