Infostealer
Phantom Stealer
According to Proofpoint, this is a fork of Stealerium that has high overlap with its originating codebase.
Phantom Stealer is a Windows infostealer.
Background
Proofpoint identifies this as a Stealerium fork that shares a great deal of code with its parent project.
Source: Malpedia (Fraunhofer FKIE).