Based on the file extension and naming convention, it is likely one of the following:
: It resembles a file used in "Capture The Flag" (CTF) competitions or cybersecurity training labs (like those found on Hack The Box or SANS Institute ), where users are tasked with analyzing a "malicious" archive. GymnKitty.rar
If you are looking for a formal report on a similar threat, you can find official through the CISA MAR Archive or the UK National Cyber Security Centre . Based on the file extension and naming convention,
: It may be a specific sample uploaded to a private or niche malware repository for research purposes. GymnKitty.rar