985,425 Plaintext Passwords Were Just Dumped on Telegram

HEROIC analysts discovered a massive stealer log collection titled "1KK UK Base UHQ Fresh Hot" circulating on a Telegram channel since May 2023. The dataset contains 985,425 compromised records, making it one of the larger single-upload credential dumps observed. Each entry exposes email addresses, plaintext passwords, and the URLs where those credentials were entered, with a heavy concentration of United Kingdom-based accounts.

Why Nearly One Million Plaintext Passwords Spell Disaster

Every password in this collection is stored in plaintext — completely unencrypted, fully readable, and ready for immediate use. There is no cracking step, no decryption phase, and no computational barrier standing between an attacker and your account. The moment someone downloads this file, they have working login credentials for hundreds of thousands of people.

The "UHQ Fresh Hot" label used by the uploader is Telegram slang for "ultra-high quality, recently harvested." This designation signals to buyers and other threat actors that the credentials are current and likely still active, making them significantly more dangerous than older, stale data dumps.

What Was Exposed in the UK Base Dump

• Email Addresses — Nearly one million email addresses linked to personal and professional accounts, exposing victims to targeted phishing and social engineering attacks.
• Plaintext Passwords — Completely readable passwords extracted from browsers and applications, requiring no additional work for an attacker to abuse.
• URLs — The specific websites and services where each credential was used, providing attackers with a precise map of every victim's online activity.

Why a Leak of This Scale Fuels Massive Credential-Stuffing Campaigns

With 985,425 credential pairs in a single dump, this collection is a goldmine for automated credential-stuffing operations. Attackers feed these email-password combinations into botnets that test them against banking platforms, email providers, e-commerce sites, and social media networks around the clock. At the scale of nearly one million records, even a small success rate yields tens of thousands of compromised accounts.

Research consistently shows that more than 60% of people reuse passwords across services. Applied to this dump, that means over half a million of these credentials could potentially unlock accounts on platforms entirely unrelated to where they were originally stolen. The ripple effect of a single leaked password can extend across a victim's entire digital life.

How Stealer Logs Amass Credentials at This Scale

Infostealer malware campaigns operate like industrial harvesting operations. Malware variants such as RedLine, Raccoon, and Vidar infect thousands of devices daily through phishing emails, malicious advertisements, and trojanized software downloads. Each infected device yields a complete log of saved browser credentials, cookies, and autofill data.

These individual logs are then aggregated by operators or resellers into large compilations. The "1KK" in this collection's name refers to approximately one million records — standard Telegram marketplace shorthand. Collections this size are assembled from thousands of individual device infections and distributed freely or sold for modest sums, putting nearly a million people's credentials in the hands of anyone willing to look.

Check If Your Credentials Appear in This Leak

With nearly one million records in a single collection, the odds of exposure are significant for anyone who has browsed the web on a device that may have been compromised. UK-based users should be especially alert, though the dump contains credentials from users worldwide.

Use HEROIC's free breach scanner to check whether your email address or passwords appear in the 1KK UK Base dump or any of the 400B+ compromised records in our database. If your credentials appear, change your passwords immediately and enable two-factor authentication on all critical accounts.