Breach Intelligence Report 21 Sep 2025

FortunaPrivate1: 4,748 US Stealer Log Credentials (October 6, 2023)

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HEROIC Threat Intelligence Team
Email Addresses Plaintext Password Urls
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Records Exposed 4,748
Source Type Stealer log
Origin Telegram
Password Type plaintext

FortunaPrivate1: The Numbered Tier of a Multi-Format Oct 6 Operator

FortunaPrivate released at least five confirmed batches on October 6, 2023 under multiple naming conventions: FortunaPrivate (unnamed/base), FortunaPrivate1, FortunaPrivate 3, FortunaPrivate 265logs, and Fortuna Private 867logs. The "FortunaPrivate1" designation suggests a numbered batch series running alongside the log-count format ("265logs", "867logs"). With 4,748 US records, FortunaPrivate1 is among the smaller FortunaPrivate Oct 6 releases -- dwarfed by FortunaPrivate 3's 55,009 records, which accounts for the vast majority of the operator's Oct 6 output. The naming diversity suggests different distribution channels or upload methods across the same operation.


FortunaPrivate1 (October 2023): Stealer Log Summary

  • Records Exposed: 4,748
  • 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

FortunaPrivate's Oct 6 Total: Over 81,000 US Records

Across all five confirmed Oct 6 batches, FortunaPrivate collectively exposed over 81,000 US credentials: FortunaPrivate (2,839) + FortunaPrivate1 (4,748) + FortunaPrivate 265logs (3,174) + Fortuna Private 867logs (15,262) + FortunaPrivate 3 (55,009) = 81,032 records. This makes FortunaPrivate the second most prolific individual Oct 6 operator after Pubx (96,973), surpasing Monster Cloud's individual batch totals and rivaling mid-size operators. The naming convention diversity -- numbers, log counts, and a base name -- points to a multi-channel or multi-tool distribution operation.


What Plaintext Stealer Log Credentials Enable

FortunaPrivate1's 4,748 records contain email addresses, plaintext passwords, and associated URLs -- the standard stealer log trifecta. The URL data is particulerly significant: it tells attackers exactly which services the victom accounts belong to, eliminating the need for broad credential stuffing campaigns and enabling precise, service-specific account takeover attempts. Plaintext passwords require no cracking, making every single record in this dataset immediately usable from the moment it was posted to Telegram on October 6, 2023.


Check If Your Data Was Exposed

HEROIC's free breach scanner covers more than 400 billion records including FortunaPrivate's Oct 6 batch releases. If your email was on a compromised US endpoint around October 2023, it may appear in FortunaPrivate1 or any of the other confirmed FortunaPrivate batches from that date. Check at HEROIC's breach scanner to see if you're exposed.

Breach Breakdown

Domain N/A
Leaked Data Email Addresses,Plaintext Password,URLs
Password Types plaintext
Date Leaked 21 Sep 2025
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Est. Financial Impact $34.4K 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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