Account Takeovers Surge After the LeakBase 4.8Mil ULP Breach

HEROIC's DarkHive monitoring systems flagged an unusual spike in credential stuffing attempts on December 4, 2024, tracing the activity back to a freshly circulated stealer log on a prominent underground hacking forum. The dump, titled LeakBase 4.8Mil ULP by BaseCreat, contained nearly five million lines harvested from infected endpoints, and cross-referencing against our 400B+ record index confirmed 702,258 unique records tied to real users. The leaked payload combined email addresses, plaintext passwords, and homepage URLs, giving attackers everything they need to impersonate victims across dozens of services. Source attribution points directly to BaseCreat, a known stealer log distributor, and the timing lined up with a sharp rise in session hijacking attempts across our protected properties.

Why This Stealer Log Is Dangerous

Unlike a traditional database breach, a stealer log like LeakBase 4.8Mil ULP by BaseCreat captures credentials as users type them, meaning the passwords are fresh, plaintext, and unsalted. There is no hashing delay to slow attackers down. Threat actors can pivot from the leaked email and password pair directly into banking portals, corporate SSO, and personal cloud storage within minutes of purchase.

What Was Exposed in LeakBase 4.8Mil ULP by BaseCreat

• Email addresses tied to 702,258 unique users
• Plaintext passwords captured directly from browser sessions
• HomePage URLs revealing the exact services each credential unlocks
• Session context suggesting malware-infected endpoints

Why This Matters

Plaintext credentials are the highest value commodity on the dark web because they eliminate the cracking step. Every exposed pair in this stealer log represents an active risk window where attackers can automate logins, drain wallets, reset recovery emails, and seed additional malware. If any of the 702,258 users reuses that password elsewhere, the blast radius expands to every linked account.

How Stealer Log Attacks Work

Stealer malware infects a device through a malicious download, cracked software, or phishing attachment. Once resident, it silently exports browser-stored credentials, autofill data, and session cookies to a remote command and control server. Operators like BaseCreat then bundle those logs and sell them in subscription marketplaces, where credential stuffing crews buy fresh dumps daily and weaponize them within hours.

Check If You Are Affected

HEROIC's 400B+ record breach scanner cross-references your email against the LeakBase 4.8Mil ULP dataset and every other exposure tracked in DarkHive. Run a free scan now to see if your credentials surfaced in this stealer log and get step-by-step remediation guidance before attackers reach your accounts.