YOULOGS MIX580pcs: 9,696 U.S. Stealer Log Credentials (Sep 2023)

The YOULOGS Machine: Two Bundles, One Day

The YOULOGS operator was exceptionally prolific on September 24, 2023. Alongside YOULOGS mix726pcs -- a bundle of 726 individual log files released the same day -- the channel also dropped YOULOGS MIX580pcs: 580 seperat log files combinied into a single bundle containing 9,696 U.S. infostealer credential records. The two bundles together represent nearly 20,000 individual American victims whose login credentials were extracted by malware and packaged for criminal sale within a 24-hour window. The relativly similar record counts despite different piece counts -- 9,696 for 580 files versus 9,683 for 726 files -- suggests the logs were sourced from different infection pools but filtered to similar quality standards before release.

YOULOGS MIX580pcs September 24, 2023: Breach Summary

• Records Exposed: 9,696
• Data Types: Email addresses, plaintext passwords, target login URLs
• Breach Type: Infostealer malware log
• Country Affected: United States
• Date Leaked: September 24, 2023

580 Pieces: Per-Victim Granularity at Scale

Like all piece-count infostealer bundles, YOULOGS MIX580pcs gives buyers 580 individual victim device log files -- each one a complete snapshot of a single infected machine's saved browser credentials at the time of compromise. The "MIX" designation confirms these were aggregated from multiple infection campaigns rather than a single malware deployment. With 9,696 records spread across 580 files, the average file contained roughly 16-17 credential pairs per device -- a typical yield for consumer machines with multiple active online accounts saved in their browsers. Each device log represents a person: their banking logins, their email accounts, their streaming services, their work portals -- all captured in a single file and sold in bulk.

YOULOGS' September 24 Output in Context

YOULOGS MIX580pcs and YOULOGS mix726pcs together add up to approximately 19,379 U.S. credential records released on a single day -- before the September 25 wave from over a dozen additional operators. The YOULOGS channel family appears to have been one of the more active distributors in this period, operating with a consistent format, consistent branding, and a consistent focus on U.S.-sourced credentials. The volume, consistency, and structure of these releases reflect a professional criminal operation rather than opportunistic one-off dumps, suggesting an operator with reliable malware infrastructure and ongoing infection capacity.

Check If Your Credentials Were Exposed

HEROIC's free breach scanner searches across more than 400 billion exposed records -- including infostealer bundles like YOULOGS MIX580pcs -- to tell you instantly if your email address or passwords have been compromised. Piece-count bundles are actively used for targeted account takeover attacks. Run a free scan today at HEROIC.com.