Monster Cloud Free 21: 13,585 US Stealer Log Credentials (Oct 6, 2023)

Monster Cloud Free 21: An Isolated Oct 6 Batch in a Structured Release Pattern

Monster Cloud Free 21, released October 6, 2023, contributes 13,585 US credentials to MC's growing confirmed Oct 6 cluster. Free 21 appears as an isolated batch within MC's Oct 6 sequence -- positioned between the Free 17-18-19 trio and the Free 27-28 pair, with Free 20 unconfirmed and potentially representing a different date. This isolation mirrors Free 9's earlier status (later confirmed as part of the Free 9-10 pair after Free 10 was verified as Oct 6), suggesting that further date confirmations could reveal additonal consecutive groupings as the dataset is fully catalogued.

Monster Cloud Free 21 (October 2023): Stealer Log Summary

• Records Exposed: 13,585
• 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 6, 2023

Monster Cloud Free 21 in the 16-Batch Oct 6 Cluster

Free 21's 13,585 records place it among the mid-tier MC Oct 6 batches by size: above Free 19 (7,040) and Free 9 (11,402) but below Free 5 (15,187), Free 10 (14,824), and the super-large Free 33 (22,858). Together, MC's 16 confirmed Oct 6 batches -- Free 4, 5, 6, 9, 10, 12, 17, 18, 19, 21, 27, 28, 30, 31, 32, 33 -- total 197,871 records. Monster Cloud was not the only major contributor that day; at least 16 non-MC operators added over 256,000 additonal records, pushing the Oct 6 grand total to aproximately 454,000 records.

Freemium Distribution and the "Free" Series

Monster Cloud's "Free" batch series represents the public-facing tier of its Telegram stealer log operation. Each "Free" release is a promotional sample -- distributed without charge to demonstrate the volume and quality of MC's credential harvest to potential buyers. By releasing 16 batches on a single day totaling nearly 200,000 records, Monster Cloud was making an unusually agressive marketing display. The scale suggests Oct 6, 2023 was a deliberate, high-visibility promotional event rather than routine daily output -- possibly timed to coincide with other operator releases in the broader multi-channel Oct 6 cluster.

Check If Your Data Was Exposed

HEROIC's free breach scanner covers more than 400 billion exposed records, including all 16 confirmed Monster Cloud Free batches from October 6, 2023. If your email address was on a US endpoint compromised by infostealer malware around that time, it may appear in Free 21 or one of the other 15 Oct 6 MC releases. Check now at HEROIC's breach scanner.