31.zip

: It is associated with Tycoon 2FA , a "phishing-as-a-service" platform designed to bypass multi-factor authentication (MFA) for Microsoft 365 and Gmail accounts.

: In research papers, "31 ZIP" may refer to specific geographical data projects, such as mapping poverty rates at the zip code level. HIOS RBIS User Manual | CMS 31.zip

The uses versioned zip files for technical specifications; for example, Form N-CEN Version 3.1 is provided as a zip file for EDGAR releases. : It is associated with Tycoon 2FA ,

A file named has been identified as highly malicious. A file named has been identified as highly malicious

In non-malicious contexts, "31.zip" often serves as a shorthand or version-specific filename:

: Security reports from ANY.RUN list various hashes (MD5, SHA256) for this file as of April 2026, marking it as a critical threat to organizations. Other Technical Uses