Dark Web Intel: 5 Million Credentials From the LeakBase 44Kk ULP Dump

In December 2024, threat intelligence analysts tracking underground forums identified a credential package posted by threat actor zinel94 on LeakBase, one of the more active dark web distribution channels for stolen credential data. The dump, labeled 44Kk ULP, contained approximately 44 million lines of raw stealer log output and exposed 5,130,809 unique email addresses paired with plaintext passwords and the specific homepage URLs where each credential was harvested. This is a URL-Login-Password (ULP) format dataset -- among the most operationally dangerous types of credential leaks because attackers receive the target site alongside the credential, eliminating the guesswork in account takeover campaigns.

Why the LeakBase 44Kk ULP Dump Is a High-Severity Threat

Most credential dumps circulating on dark web forums contain hashed passwords that require significant compute time to crack. The 44Kk ULP dataset contains plaintext passwords -- the credentials are ready to deploy the moment a buyer downloads the archive. With over five million email-password-URL triplets available for immediate use, this dump represents a ready-made toolkit for automated account takeover at scale. The homepage URLs in the dataset mean attackers know exactly which services to target for each victim, dramatically increasing the efficiency of credential stuffing campaigns.

What Was Exposed in the LeakBase 44Kk ULP Breach

• Email Addresses -- 5,130,809 unique accounts exposed and mapped to active services
• Plaintext Passwords -- unencrypted, immediately usable credentials requiring no additional cracking
• HomePage URLs -- the specific websites from which each credential set was harvested, enabling precision account targeting

Why This Matters: Credential Stuffing, Account Takeover, and Identity Theft

When plaintext credentials tied to specific websites circulate on dark web markets, the downstream consequences are well-documented and severe:

• Credential stuffing -- automated bots systematically test each email-password pair against banking portals, e-commerce sites, and email providers, exploiting widespread password reuse
• Account takeover (ATO) -- attackers lock victims out by changing email addresses, phone numbers, and recovery options immediately after gaining access
• Identity theft -- compromised email accounts unlock password resets on financial, government, and insurance accounts
• Fraud and unauthorized transactions -- e-commerce and banking credentials enable direct financial theft within minutes of a successful login
• Lateral credential reuse -- because most users reuse passwords, a single compromised credential often provides access to multiple unrelated services

How Stealer Log Credential Harvesting Works

The 44Kk ULP dataset originates from information-stealing malware -- a category of malicious software designed to silently extract credentials from infected devices rather than attack corporate servers directly. Here is the typical attack chain:

1. Malware delivery -- Victims download infected files through phishing emails, fake software cracks, malicious browser extensions, or compromised download sites
2. Credential extraction -- The stealer silently reads saved passwords from browsers (Chrome, Firefox, Edge), password manager caches, and application login stores
3. URL mapping -- The malware records which website each credential belongs to, creating the URL-Login-Password triplets that define the ULP format
4. Data exfiltration -- Harvested credentials are compressed and transmitted to attacker-controlled infrastructure
5. Dark web distribution -- Actors like zinel94 package and post aggregated logs on forums like LeakBase, where other criminals purchase or download the datasets for their own campaigns

Check If You Are Affected

The HEROIC Identity Scanner searches more than 400 billion exposed records -- including stealer log dumps like the LeakBase 44Kk ULP dataset -- to determine instantly whether your email address or passwords appear in known breaches. If your credentials were harvested and included in this dump, you need to know now, before an attacker uses them.

Scan your email at HEROIC.com -- free, takes under 30 seconds, and covers over 400 billion breach records.