Breach Intelligence Report 22 Sep 2025

Klaus_cloud_public 528logs: 14,824 US Credentials — Second Oct 6 Batch, 25,174 Combined

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Email Addresses Plaintext Password Urls
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Records Exposed 14,824
Source Type Stealer log
Origin Telegram
Password Type plaintext

Klaus_cloud_public's Second Strike: 528logs and 28.1 Records Per File

Klaus_cloud_public's 528logs release on October 6, 2023 is the operator's second confirmed dataset from that day -- following the earlier 351logs batch (10,350 records at 29.5/file). Together they push Klaus_cloud_public's Oct 6 total to 25,174 records, making it the fourth-largest individual operator on the day by combined volume. What's realy notable about Klaus_cloud_public is consistency: both batches clock in at near-identical per-file yields (29.5 and 28.1 respectively), a pattern that suggests a stable, high-quality source of infected endpoints rather than opportunistic collection.


Klaus_cloud_public 528logs (Oct 6, 2023): Stealer Log Summary

  • Records Exposed: 14,824
  • 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

Per-File Yield: Klaus_cloud_public vs. the Oct 6 Operator Field

Among all confirmed Oct 6 operators, Klaus_cloud_public 351logs holds the day's highest per-file yield at 29.5 records/file. The 528logs batch (28.1/file) sits just below -- still comfortably ahead of Usmancloud 733logs (28.0/file), BananaLogs 495count (18.5/file), and the SunCloudPubl batches. At the bottom of the range sits prdscloud 762logs (2.2/file), whose anomalous yield stands in stark contrast to prdscloud's other two Oct 6 batches (25.4/file and 26.4/file). Klaus_cloud_public's consistency across two batches is exceptionally unusual in this enviroment.


Klaus_cloud_public in the Oct 6 Hierarchy

Ranked by single-day volume, Klaus_cloud_public's 25,174 combined records place it fourth among Oct 6 operators, trailing only Monster Cloud (355,244, now 25 confirmed batches), Pubx (160,572 across two batches), and FortunaPrivate 3 (55,009). Usmancloud 733logs (20,522) and TG hulk_logs (11,981) follow Klaus in the rankings. The Oct 6 cluster continues to expand as new batches are confirmed -- the grand total now exceeds 728,000 exposed US records, surpasing the previously-cited 660,000 figure as additional MC batches have been confirmed.


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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 $107.3K 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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Critical: Change compromised passwords immediately and enable 2FA on all accounts

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