HelloKitty was involved in an attack against the Polish video game developer, CD Projekt Red, in early February. Ransomware was first seen in November 2020, a few months after the first variants of Egregor were spotted in the wild. This strain was named after a mutex it used called HelloKittyMutex The ransom note is usually a plain text file bearing either the name of the target or the file names of the targeted files. It can target and terminate over 1,400 processes and services.”]
Source: https://blog.malwarebytes.com/threat-spotlight/2021/03/hellokitty-when-cyberpunk-met-cy-purr-crime/