HEROIC Confirms 13,789-Record Monster Cloud Free 10 Breach

Monster Cloud Free 10: The Fourth Batch in a Single Day

Monster Cloud ran one of the most consitent multi-batch operations on October 18, 2023. Free 10 -- 13,789 plaintext US credentials across a single consolidated release -- was the fourth confirmed Monster Cloud batch on that day, following Free 5, Free 6, and Free 9. The "Free" naming convention is significant: it indicates these were publically distributed releases, made available without a purchase barrier, likely to build audience trust, attract buyers for premium offerings, or establish channel credibility in the underground marketplace.

Monster Cloud Free 10 (October 2023): Stealer Log Summary

• Records Exposed: 13,789
• Data Types: Email addresses, plaintext passwords, URLs
• Breach Type: Stealer log -- credentials harvested from malware-infected endpoints, not a direct database breach
• Password Type: Plaintext -- captured directly from browser sessions and credential stores by infostealer malware
• Country: United States
• Date Leaked: October 18, 2023

Four Batches, One Day: Monster Cloud's Oct 18 Footprint

Monster Cloud Free 5, 6, 9, and 10 were all confirmed released on October 18, 2023 -- a single operator accounting for over 44,500 combined credentials in one 24-hour window. The episode numbering (Free 5 through Free 10 with gaps at 7 and 8) suggests these were per-event batch labels, not a sequential global series. Free 10 at 13,789 records was the largest of the four Oct 18 batches, though they varied in size. Combined, Monster Cloud's output on October 18 alone would rank among the higher single-day volumes from any operator in this dataset.

The "Free Sample" Distribution Model

Releasing stealer logs for free is a common underground marketplace tactic. By providing free acess to legitimate credential data, operators demonstrate the quality and freshness of their product before charging for larger or more targeted collections. Monster Cloud's "Free" series positions each batch as a sample release -- enough to be useful to buyers, but a fraction of what a paid offering might include. This model also drives channel growth: free releases attract subscribers who become paying customers for future batches.

October 18 as a Distribution Inflection Point

Monster Cloud was not alone on October 18, 2023. Alongside Free 5, 6, 9, and 10, at least a dozen other operators released stealer log batches the same day -- including 10.18 - LOGS_CENTER (28,864 records), BananaLogs (18,391 combined), DAMN_ISRAEL OTTOHELP (multiple archive batches), Suncloud 500, RedlineLogsGroup, PiratesLogs, and PremCloud. The total credential count for October 18, 2023 across all known operators in this dataset exceeds 150,000 US records -- a volume that makes it one of the more significant single-day stealer log distribution events in the breach record.

Check If Your Data Was Exposed

HEROIC's free breach scanner searches more than 400 billion exposed records, including the Monster Cloud Free series and hundreds of thousands of other stealer log and database breach collections. Check if your credentials appeared in Free 10 or any other release -- for free -- at HEROIC's breach scanner.