Infostealer
Arkei Stealer
aka ArkeiStealer
Arkei is a stealer that appeared around May 2018.
Arkei Stealer, also known as ArkeiStealer, is a Windows infostealer.
Background
Arkei is an information stealer that surfaced around May 2018. It harvests browser data (stored passwords and autofill entries), cryptocurrency wallets, and any files that match a pattern defined by the attacker. The gathered material is then bundled into a zip archive and uploaded to the operator's panel. The stealer was later forked to serve as the foundation for the Vidar stealer.
Source: Malpedia (Fraunhofer FKIE).