If you encounter this file on your computer, it is a high-confidence indicator of a security compromise:
is a filename frequently associated with the output of malicious credential harvesting tools and "stealer" malware. It is not a standard system file or a legitimate log file used by reputable software. Origin and Purpose
The existence of "Valid Sessions" in a text file means an attacker has likely bypassed Multi-Factor Authentication (MFA) by stealing the active session cookies directly from your browser.
It usually stores structured data including the website URL (often social media platforms like Facebook), the session cookie/token, and sometimes the account name.
Log into your critical accounts (Email, Banking, Social Media) from a different, clean device and select "Log out of all other sessions."
When found on a system, it often appears in the directory of an executable like NArK6vBU1f.exe or other generic, randomly named binaries that have been flagged as trojans or info-stealers. Risks and Indicators
Update your credentials only after you are certain the infected device is clean or has been wiped.