1,137 Microsoft Plaintext Passwords Dumped on Telegram

HEROIC's threat intelligence team flagged a stealer log labeled "Microsoft 11" on Telegram that contains 1,137 compromised records specifically targeting Microsoft account credentials. This dataset includes plaintext passwords alongside Microsoft email addresses and the login URLs where these credentials were captured by infostealer malware.

Microsoft Passwords Exposed Without Encryption

All 1,137 passwords in this collection are stored in plaintext—unencrypted and fully readable. For Microsoft accounts, this is particularly dangerous because a single set of credentials can unlock access to Outlook email, OneDrive cloud storage, Microsoft Teams, Xbox Live, and potentially Microsoft 365 enterprise services. No cracking is needed; these passwords work as-is.

What Was Exposed

• Email Addresses – Microsoft account identifiers linked to the broader Microsoft ecosystem
• Plaintext Passwords – Unencrypted credentials for Microsoft services
• URLs – Microsoft login endpoints where credentials were captured

The Ripple Effect of Microsoft Account Compromise

Microsoft accounts serve as a central hub for personal and professional digital activity. A compromised Microsoft password can give an attacker access to years of email correspondence, shared documents, contact lists, and calendar entries. For business users, it may also expose corporate files through OneDrive and SharePoint. Credential stuffing further amplifies the risk if the same password is reused on non-Microsoft platforms.

How Microsoft Credentials End Up in Stealer Logs

Infostealer malware families such as Redline, Lumma, and Aurora infect devices through phishing links, malicious downloads, and compromised advertisements. Once active, they extract every saved password from the victim's web browsers, including Microsoft login credentials saved for quick access. These credentials are packaged into themed collections—like this Microsoft-focused dump—and distributed through Telegram for other attackers to exploit.

Check If Your Credentials Were Exposed

HEROIC's free breach scanner indexes over 400 billion compromised records. Search your Microsoft email address or domain to check whether your credentials appear in this Microsoft 11 dump or any other known data breach. If you find your account is compromised, change your Microsoft password immediately, enable multi-factor authentication, and review your account's sign-in activity for unauthorized access.