The LeakBase Blockchair Leak Could Unlock Your Bank, Email, and Social Accounts

The LeakBase 1.19Kk ULP blockchair stealer log does not just expose one account -- it hands attackers a passkey to every service where those same credentials were reused. Posted to a hacking forum on October 19, 2024, this dump contains 140,240 unique email and plaintext password combinations pulled from compromised devices on October 15, 2024. Each record is a potential starting point for a chain of account takeovers that could reach banking portals, email providers, and cloud storage in a single automated session.

Why This Is Dangerous

Stealer logs capture credentials at the point of entry -- directly from the infected user's browser -- meaning the passwords are always current at time of capture. This makes them significantly more dangerous than aged database dumps. The blockchair log is sourced from infostealer malware that recorded active login sessions, giving attackers credentials that were working and in use as recently as mid-October 2024.

What Was Exposed

• Email addresses -- account identifiers that unlock authentication flows across virtually every online service
• Home page URLs -- reveals exactly which service each credential belongs to, enabling precisely targeted attacks
• Plaintext passwords -- immediately usable with zero decryption or cracking required

Why This Matters: The Chain Reaction

A single leaked credential can unlock far more than one account. Here is how the cascade works:

• Credential stuffing: The email/password pair is tested across banking, social media, e-commerce, and email platforms simultaneously by automated bots.
• Email account takeover: Once an attacker controls your email, they can trigger password resets for every other service tied to that address.
• Banking and financial fraud: With email access confirmed, attackers reset banking credentials and initiate fraudulent transfers.
• Identity theft: Control of email plus knowledge of associated services enables full identity reconstruction for document fraud and credit applications.
• Social media hijacking: Compromised social accounts are used for further scams, spreading malware to contacts, or ransomed back to the owner.

How Stealer Log Breaches Work

Infostealer malware -- delivered through phishing emails, pirated software, or malicious browser extensions -- installs silently and harvests saved passwords directly from browsers like Chrome and Firefox. The data is bundled into logs and sold or posted on underground forums. The 1.19Kk ULP log is one such collection, attributed to a threat actor posting under the name blockchair, who uploaded 1.19 million records (140,240 unique) pulled from compromised endpoints in the days before the October 19th posting.

Check If You Are Affected

Heroic's breach search engine covers over 400 billion compromised records, including stealer log collections like this one. Search your email address now to see if your credentials appeared in this dump or any other known breach -- and get specific steps to secure your accounts before attackers exploit the chain.