The SSA OIG explicitly states they do not send unsolicited emails with attachments for "security updates."
The file appears to be a segment of a multi-part compressed archive, likely associated with a distributed software package, game mod, or large data backup. Technical Breakdown SS-Sav-004_v.7z.002
The "7z" within the name confirms the 7z format , which is known for high compression ratios and strong AES-256 encryption capabilities. The SSA OIG explicitly states they do not