The LeakBase FFish Dump Exposed 12.6 Million U.S. Accounts in One Release

The LeakBase 140M+ ULP FFish dump exposed over 12.6 million U.S. and global accounts in a single release posted to an underground forum on October 19, 2024. The archive -- 3.44GB compressed, 9.64GB uncompressed -- contains email addresses, the URLs of services victims were logged into, and plaintext passwords harvested from compromised devices. At this scale, it represents one of the larger stealer log releases tracked by breach monitoring services in late 2024.

Why This Is Dangerous

With over 12.6 million unique credential sets in a single file, this dump is a bulk tool for automated attacks. Threat actors do not need to target individual users -- they feed the entire archive into credential-stuffing infrastructure and let automation find which accounts are still valid. The inclusion of home page URLs means the attacker already knows which service each credential belongs to, eliminating the guesswork and dramatically accelerating the attack cycle.

What Was Exposed

• Email addresses -- 12.6 million unique identifiers usable for phishing, credential stuffing, and account targeting at massive scale
• Home page URLs -- precise service mapping linking each credential to the platform it was captured from
• Plaintext passwords -- immediately deployable with no cracking step; captured live from browser sessions via infostealer malware

Why This Matters

The sheer volume of this dump creates compounding risks for affected individuals:

• Credential stuffing at scale: 12.6 million email/password pairs give attackers enough volume to compromise thousands of accounts even with low success rates.
• Account takeover: Successful logins lead to immediate lockout of the real owner and exploitation of the account for fraud or further access.
• Identity theft: Email access plus service mapping lets attackers reconstruct digital identities and abuse financial accounts.
• Dark web resale: Validated credentials from this dump are re-sold in curated packages, extending the threat lifecycle well beyond the original leak date.

How Mass Stealer Log Breaches Work

The "140Million+ Url Login Pass" is an aggregated infostealer log -- a collection of credentials scraped from thousands of infected endpoints by malware like RedLine, Raccoon, or similar strains. These infostealers spread via phishing emails, malicious ads, and trojanized software downloads. Each infected device contributes a bundle of browser-saved passwords, which are aggregated by the threat actor and released as a single bulk dump. The FFish attribution identifies the threat actor who posted and distributed this particular collection on the forum.

Check If You Are Affected

With over 12.6 million unique records in this dump alone, the odds of exposure are significant. Heroic's breach search engine indexes over 400 billion compromised records -- including large-scale stealer log releases like this one. Search your email address now to check if your credentials appeared in this or any other known breach, and get immediate steps to secure your accounts.