Inside the LeakBase chronos_cloud Log: How Stealer Malware Harvested 214,710 Passwords

On November 24, 2024, a threat actor operating under the handle "uniqum" posted a stealer log to a popular underground hacking forum, catalogued as "chronos_cloud 500K ULP by uniqum" on LeakBase. The log contained approximately 500,000 URL-Login-Password (ULP) records, of which 214,710 were unique email addresses paired with their corresponding plaintext passwords and associated homepage URLs. This is not a traditional database breach -- it is the direct output of credential-harvesting malware that infected victims' devices and silently siphoned their saved passwords before exfiltrating them.

Why This LeakBase Stealer Log Is Especially Dangerous

Unlike a hashed password dump that requires cracking, stealer logs deliver credentials in plaintext -- the actual password the victim types. There is no waiting, no cracking, no guessing. An attacker with this log can attempt to log in to the listed URLs immediately, with zero friction. The homepage URLs in the dataset also reveal exactly which sites the victims were using, allowing attackers to prioritize high-value targets such as banking portals, cryptocurrency exchanges, email providers, and corporate VPNs. Every record in this log is an immediate, actionable credential.

What Was Exposed

• 214,710 unique email addresses
• Plaintext passwords (exactly as typed by the victim)
• Homepage URLs (revealing which sites the credentials belong to)

Why This Matters

Stealer logs represent one of the most operationally ready datasets in the cybercriminal ecosystem:

• Immediate account takeover: Plaintext credentials require no processing -- attackers log in directly to the listed site as soon as the log is acquired.
• Credential stuffing: Emails and passwords are tested across every major platform simultaneously using automated tools, targeting banking, email, and social media accounts.
• Financial fraud: Banking and payment site credentials in the log enable direct fund theft or fraudulent transaction initiation.
• Corporate infiltration: VPN, webmail, and SaaS credentials in the log give attackers a foothold into employer networks and internal systems.
• Identity theft: Credentials for government portals, insurance platforms, and healthcare sites allow impersonation and benefits fraud.

How Stealer Malware Harvests Passwords

Stealer logs are generated by a class of malware known as information stealers -- programs like RedLine, Vidar, Raccoon Stealer, and MetaStealer that are typically delivered via phishing emails, malicious software cracks, fake browser extensions, or trojanized downloads. Once installed on a victim's machine, the stealer silently extracts saved passwords from browsers (Chrome, Firefox, Edge), email clients, FTP tools, and any application that stores credentials locally. It also captures cookies (enabling session hijacking without a password), autofill data, and browsing history. The extracted data is packaged into a structured log -- in ULP format, one URL-login-password triplet per line -- and transmitted to the attacker's command-and-control infrastructure. These logs are then bundled and sold or posted on forums like LeakBase, where they are traded for profit or further distributed.

Check If You Are Affected

If your device has been compromised by stealer malware, the passwords saved in your browser may already be in criminal hands -- regardless of how strong those passwords are. Use the HEROIC breach search tool -- backed by over 400 billion compromised records -- to check whether your email address appears in this log or other known breaches. If you find a match, treat every saved browser password as compromised: change them all, revoke active sessions on critical accounts, and enable two-factor authentication. Running a full malware scan on your device is also strongly recommended.