Trojan:JS/Cryxos is the threat that delivers notification messages about computers’ or web browsers’ issues that the virus triggered

From 2-spyware.com

Trojan:JS/Cryxos

Trojan Cryxos – an infection that displays alerts with phone numbers and offerings to assist in removal processes. This is a support scam that aims to trick people into calling the shady support number or contacting the alleged technicians’ team in different ways. Nevertheless, there is no need to call the number or ask for help from these people because this trojan does not alert about real issues. This is a pure scam aiming to get money or sensitive information from victims.

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