How the AYANKOUJI PRIVATE 595 Part 3 Stealer Log Led to 3,277 Stolen Logins

HEROIC analysts spotted the AYANKOUJI PRIVATE 595 part 3 stealer log on October 31, 2025, after it was uploaded to a Telegram channel known for distributing infostealer output. The file contained 3,277 records consisting of email addresses, plaintext passwords, and associated service URLs harvested from infected endpoints. Despite being the smallest of the AYANKOUJI PRIVATE 595 series, the data is no less actionable. Each record represents a real person whose login credentials were silently extracted from their device and are now freely available for download by anyone with access to the channel.

Why This Is Dangerous

A credential dump of 3,277 records may sound modest, but its real danger lies in quality, not quantity. Infostealer logs capture credentials at the moment of use, meaning these passwords were confirmed working at the time of theft. Attackers do not need to guess or crack anything. They load the log into an automated credential stuffing tool and begin testing accounts across banking sites, email providers, and corporate portals within minutes. The inclusion of service URLs makes targeting even easier, since attackers already know which platforms each victim uses. Every record in this file is a direct threat to someone's financial security, personal data, and online identity.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs (active services accessed by victims)
• API host information
• Endpoint identifiers from compromised machines

Why This Matters

Credential leaks from stealer logs are a primary fuel source for credential stuffing attacks, where stolen login pairs are systematically tested against popular platforms. When an attacker lands a valid login, account takeover follows quickly. From there, the harm cascades: stored credit cards get charged, email accounts get used to reset passwords elsewhere, and identity theft becomes a real possibility if government or healthcare portals are involved. For corporate victims, a single compromised employee login can give an attacker entryway into internal systems, leading to data exfiltration or ransomware deployment. Financial fraud and reputational damage are consistent downstream outcomes of even small-scale credential leaks like this one.

How the AYANKOUJI PRIVATE 595 Stealer Log Happened

The AYANKOUJI PRIVATE 595 series, of which part 3 is the latest installment, is the product of infostealer malware that infected a collection of user endpoints at some point before October 31, 2025. The malware, likely delivered via a phishing campaign, a malvertising redirect, or a trojanized software package, installed itself silently and began harvesting credentials from the victim's browser, saved logins, and active sessions. Each time the victim logged into a website or application, the stealer captured the username, password, and URL, building up a log file over time. Once enough data was assembled, the operator packaged the results into the file labeled AYANKOUJI PRIVATE 595 part 3 and uploaded it to Telegram, making it freely accesible to the broader threat actor community. The part numbering indicates this was at least the third batch extracted from the same campaign or set of compromised endpoints.

Check If You Are Affected

If you used any online accounts before late October 2025, your credentials could be among the 3,277 records in this stealer log. HEROIC maintains a breach intelligence database covering more than 400 billion compromised records, giving you one of the most complete pictures available of what data is circulating among threat actors. Head to heroic.com and search your email address to find out whether AYANKOUJI PRIVATE 595 part 3 or any other known breach includes your information. If there is a match, change that password immediately, and prioritize any accounts that share the same password across multiple services.