Breach Intelligence Report 22 Sep 2025

Monster Cloud Free 15: 10,684 US Records — The Link Completing the Free 12-19 Octet

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Email Addresses Plaintext Password Urls
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Records Exposed 10,684
Source Type Stealer log
Origin Telegram
Password Type plaintext

Monster Cloud Free 15: The Link Between Free 14 and Free 16 in the Oct 6 Octet

Monster Cloud Free 15's confirmation as an October 6, 2023 release plays a structural role that outweighs its 10,684-record count. By confirming that Free 15 is Oct 6, the previously separate "Free 12-14 group" and "Free 16-17-18-19 quad" are now connected into a single 8-batch octet: Free 12 through Free 19. Free 15 is the penultimate link -- sitting between Free 14 (19,536) and the super-large Free 16 (21,307). Without Free 15's confirmation, the sequence would have appeared to gap between Free 14 and Free 16, leaving ambiguaty about whether Free 15 was an Oct 7 release or a different date altogether.


Monster Cloud Free 15 (Oct 6, 2023): Stealer Log Summary

  • Records Exposed: 10,684
  • 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

The Free 12-19 Octet: Largest MC Consecutive Sequence

Free 12 (10,475), Free 13 (18,366), Free 14 (19,536), Free 15 (10,684), Free 16 (21,307), Free 17 (12,380), Free 18 (10,144), and Free 19 (7,040) are all confirmed Oct 6 releases. Together they total 109,932 records -- the largest confirmed consecutive batch run in MC's Oct 6 portfolio. This eclipses the Free 4-5-6-7-8-9-10 septet (100,959 records) and more than doubles the record count of the Free 23-24-25-26-27-28 sextet (73,830). Free 15, though the third-smallest batch in the octet, is the confirming link that makes the octet possiblee.


MC's Oct 6 Scope: 29 Batches, 404,809 Records

Monster Cloud's confirmed Oct 6 batch count now stands at 29, with a total of 404,809 records. Combined with 381,921 records from non-MC operators, the Oct 6 grand total exceeds 786,000 exposed US stealer log credentials. Every new batch confirmation reveals that October 6, 2023 was an even more extraordinary event than initialy estimated -- now surpassing October 7's 462,187 records by more than 324,000, a margin that continues to widen with each confirmed batch.


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Breach Breakdown

Domain N/A
Leaked Data Email Addresses,Plaintext Password,URLs
Password Types plaintext
Date Leaked 22 Sep 2025
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Est. Financial Impact $77.3K fraud, phishing & misuse risk
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Identity Theft Risk Score

Risk Score: 8.7/10 - Critical

Data Exposure Analysis

Passwords Critical
Financial High
Personal Medium
Social High
Security Critical

Breach Timeline Analysis

March 2024 Multiple credentials exposed in recent data breach
January 2024 Password found in dark web marketplace
December 2023 Personal information leaked in major security incident

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