Yahoo Part2 27 Leak: Inside a 251,786-Record Stealer Log

HEROIC analysts identified a dataset called "yahoo Part2 27" after it was uploaded to a Telegram channel, with underlying data dated April 2, 2023. The file focuses specifically on webmail accounts and contains 251,786 records, each pairing an email address with a plaintext password and the URL of the login page it was captured from.

Why Webmail Accounts Are a Prime Target

Email providers sit at the center of most people's digital lives, every "forgot password" link, every account recovery flow, routes through the inbox. That's what makes a webmail-focused leak like this one especially valuable to attackers: with 251,786 plaintext credentials in hand, gaining access to someone's email account can be the first step toward taking over nearly every other account tied to it.

What Was Exposed

• Email addresses
• Plaintext passwords
• Login URLs tied to each credential

Why This Matters

Because email accounts are the gateway to banking, shopping, and social media logins, a compromised inbox from this leak can quickly cascade into credential stuffing, full account takeover, and financial fraud across services that have nothing to do with email itself. The "Part2" in the filename also suggests this is one installment in a larger, ongoing series targeting the same webmail provider.

How Stealer Logs Work

This dataset is a stealer log, harvested by malware installed on victims' own devices rather than a breach of the email provider's servers. The malware scans the browser for saved logins, and in this case the seller appears to have filtered and packaged the results specifically by email provider, likely to appeal to buyers looking for webmail access rather than a broad, unsorted mix. Splitting a large haul into numbered "parts," as seen here, is a common tactic sellers use to sustain interest and sales over time.

Check If You Are Affected

If you use this email provider, it's worth checking whether your account appears in this leak. HEROIC's free breach scanner searches more than 400 billion breached records, this dataset included, so you can find out in seconds and secure your inbox before it's used to reach further into your accounts.