These files are usually generated by like RedLine, Lumma, or Raccoon Stealer. When a user's computer is infected, the malware scrapes "session cookies" from browsers like Chrome or Firefox .

: Hackers use these stolen files to perform session hijacking . By importing your stolen cookie into their own browser, they can bypass your password and even multi-factor authentication (MFA) to gain full access to your accounts. What are cookies? | Cookies definition - Cloudflare

: An archive containing "1,304 hits" suggests it holds over 1,300 active or recently active login sessions for various services.