U.S. Users Targeted: Ninho Hotmail Log Exposes 376 Passwords

HEROIC analysts detected a second stealer log file bearing the "Ninho Private Hotmail" label, uploaded to Telegram on June 29, 2026. This batch contains 376 records consisting of email addresses, plaintext passwords, and associated URLs. The repeated appearance of dumps from this source suggests an ongoing campaign to harvest and distribute Microsoft account credentials through infostealer malware.

Why Readable Passwords Are Immediately Weaponized

Every password in this dump is stored in plaintext. That means an attacker who accesses the file can copy and paste credentials directly into a login form. There is no need for password-cracking software, GPU clusters, or rainbow tables. The credentials are operational the instant they are downloaded.

The danger is compounded by the fact that these are Hotmail and Microsoft-linked accounts. Gaining access to a victim's email inbox gives an attacker the ability to read private correspondence, intercept security alerts, and initiate password resets on connected services. A single exposed Hotmail credential can become the starting point for a much broader compromise.

What Was Exposed in the Ninho Private Hotmail Dump

• Email Addresses — Microsoft account identifiers including Hotmail, Outlook, and Live addresses, each serving as a key to a broader ecosystem of connected services and stored data.
• Plaintext Passwords — Unencrypted credentials harvested from browser password stores, presented in their original form with no protective encoding.
• URLs — Website addresses and login pages recorded at the time of capture, providing attackers with a roadmap of each victim's online activity and account locations.

Why Repeat Dumps Compound the Risk

This is the second Ninho Private Hotmail file identified by HEROIC analysts in June 2026 alone. Repeat dumps from the same source indicate that the threat actor behind these compilations has sustained access to fresh infostealer logs and is actively curating them for distribution. Victims who appeared in the earlier dump may appear again, and new victims are added with each release.

For the 376 individuals in this batch, the window for exploitation may already be closing. Credential-stuffing bots operated by other threat actors monitoring the same Telegram channel could have begun testing these passwords against popular services within hours of the file's appearance. The longer compromised credentials remain unchanged, the greater the likelihood of unauthorized access.

How Stealer Logs Reach Telegram Channels

The pipeline from infection to exposure follows a well-established pattern. A victim unknowingly installs infostealer malware through a malicious email attachment, a fake software download, or a compromised website. The malware runs silently in the background, extracting saved passwords, session cookies, and browser autofill data from the device.

This stolen data is transmitted to the attacker's infrastructure and organized into log files. From there, the logs are either sold on underground markets or shared freely on Telegram to build reputation within cybercriminal communities. Curated collections like Ninho Private Hotmail are particularly sought after because they pre-filter credentials by email provider, saving buyers the effort of sorting through mixed datasets.

Check If Your Credentials Were Exposed

With stealer log compilations appearing on a recurring basis, checking your exposure is not a one-time task. HEROIC's free breach scanner draws on a database of more than 400 billion records, updated continuously as new breaches and leaks are indexed. Searching your email address takes seconds and can reveal whether your credentials appear in this Ninho Private Hotmail dump or any of thousands of other compromised datasets.

If your credentials are found, change the compromised password without delay. Enable multi-factor authentication on your Microsoft account and every other service that supports it. Review your account's recent sign-in activity for any unfamiliar locations or devices, and consider running a full malware scan on your devices to ensure no infostealer is still active.