AYANKOUJI PRIVATE 595 Leaked Months Ago. The Data Just Went Public.

HEROIC analysts identified a stealer log upload on October 31, 2025, posted to a prominent Telegram channel by an anonymous user. The file, labeled "AYANKOUJI PRIVATE 595," contained 4,904 records with plaintext passwords, email addresses, and API host URLs. Unlike mass data dumps that contain millions of recycled records, this upload stood out for its tight scope and the fact that every credential appeared in cleartext with no hashing or obfuscation. Analysts flagged it immediately as a high-severity threat due to the direct usability of the exposed data.

Why This Is Dangerous

Stealer log data does not need to be decoded, cracked, or processed before an attacker can use it. Every password in this file is readable on first glance. A threat actor who downloads this log can begin attempting logins within minutes of obtaining it. Because many users reuse passwords across multiple services, a single exposed credential can unlock email inboxes, cloud storage, banking portals, and social media accounts. The API host URLs included in this log make the situation even more serious, since they point attackers directly at specific endpoints where these credentials were active. This isn't just a list of stolen data -- it's a ready-made toolkit for account takeover.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs and API Host Endpoints

Why This Matters

When plaintext credentials leak alongside the specific services they authenticate, the downstream risk multiplies rapidly. Attackers use credential stuffing tools to test stolen username and password pairs against dozens of platforms at once. A single valid combination can lead to full account takeover in minutes. From there, identity theft becomes trivial -- attackers can reset other passwords, intercept two-factor codes, and drain financial accounts. For businesses whose employee or customer credentials appear in stealer logs, the risk extends to lateral movement inside corporate systems, espionage, and data exfiltration. The combination of email, password, and API endpoint in one record gives attackers everything they need to cause serious, lasting damage.

How Stealer Logs Work

Stealer logs are produced by a category of malware known as infostealers. These programs are typically delivered through phishing emails, malicous software downloads, or fake browser extensions. Once installed on a victim's device, the malware silently harvests saved browser credentials, cookies, autofill data, and sometimes API keys or tokens stored in application config files. The harvested data is packaged into a structured log file and transmitted to a command-and-control server, or sold directly to a Telegram channel or dark web marketplace. Unlike database breaches that require attackers to compromise a company's servers, stealer logs target individual users directly -- meaning no organization needs to be "hacked" in the traditional sense. The credentials simply appear one day, pulled from thousands of infected devices worldwide.

Check If You Are Affected

If your email address appears in this stealer log, your password and the services you authenticate with may already be in the hands of threat actors. HEROIC's breach search database contains over 400 billion records from thousands of known breaches and stealer log dumps. Visit heroic.com to search your email address and find out wether your credentials have been exposed. Acting quickly -- changing passwords and enabling two-factor authentication -- is the single most effective way to reduce your risk after a credential exposure like this one.