If You Reuse Passwords, the Mansory Leak Should Worry You

HEROIC's threat intelligence team detected a large-scale stealer log titled "Mansory 1" circulating on Telegram, containing 730,986 compromised records. This substantial dataset was compiled from infostealer malware harvests and contains plaintext passwords paired with email addresses and the URLs of services where each credential was used.

730,986 Passwords in the Clear

Every password in this Mansory dump is stored in plaintext—fully readable and immediately exploitable. There is no encryption, hashing, or other protection between these credentials and an attacker. At this scale, automated attack tools can process the entire dataset and begin testing logins across the internet within hours of the file being shared.

What Was Exposed

• Email Addresses – Primary account identifiers used across countless online services
• Plaintext Passwords – Readable credentials requiring no technical effort to exploit
• URLs – The login pages and services where each password was captured

Why Password Reusers Should Be Concerned

If you use the same password on more than one website, a breach of this magnitude directly threatens you. Credential stuffing attacks—where stolen logins are automatically tested against thousands of services—succeed precisely because password reuse is so common. With 730,986 credential pairs, attackers have an enormous list to work through, and even a small success rate translates into thousands of compromised accounts.

The Scale of Infostealer Operations

Stealer logs of this size reflect the industrial scale of modern infostealer campaigns. Malware variants like Redline, Lumma, and Vidar are distributed through phishing campaigns, cracked software downloads, and malicious advertisements. Each infection harvests every saved credential from a victim's browsers, producing logs that are aggregated into massive collections like this Mansory dataset and traded through criminal channels.

Check If Your Credentials Were Exposed

With more than 400 billion compromised records in its database, HEROIC's free breach scanner can determine whether your email or domain appears in this Mansory dump or any other known breach. Given the scale of this leak, checking your exposure is essential. If found, change your passwords immediately, use unique credentials for every account, and enable multi-factor authentication wherever possible.