KeyCloud_Free_logs119: LOGSYNC Telegram Stealer Log Leaked 15,861 Logins

HEROIC analysts identified a stealer log file named KeyCloud_Free_logs119, uploaded to a Telegram-based leak channel known as LOGSYNC on May 27, 2025. Unlike a breach of a single company's database, this file is a raw dump of credentials harvested directly from infected computers. It contains 15,861 records made up of email addresses, plaintext passwords, and the URLs of the login pages those credentials were used on.

Why This Is Dangerous

Because the passwords in this log are stored in plaintext, there is no cracking or guessing required. Anyone who downloads this file has instant, ready-to-use logins paired with the exact web address each one unlocks. That combination lets an attacker skip straight to logging in as the victim on the very sites the malware recorded, with no extra effort.

What Was Exposed in the KeyCloud_Free_logs119 Stealer Log

• Email addresses tied to infected devices
• Plaintext passwords, stored with no hashing or encryption
• URLs showing exactly which sites and services each login belongs to

Why This Matters

Stealer logs like this one are especially dangerous because they pair working credentials with the destination site, making credential stuffing almost effortless for attackers. If any of the 15,861 exposed logins belong to an email provider, banking site, or work account, the person behind it faces a real risk of account takeover, identity theft, or financial fraud, often without any warning that their machine was ever infected.

How Stealer Logs Work

A stealer log is generated by malware that infects a person's device, often through a fake download, cracked software, or malicious email attachment. Once installed, the malware quietly scans the browser for saved logins, autofill data, and session information, then sends everything it finds back to the attacker. That data is packaged into a log file, like KeyCloud_Free_logs119, and sold or shared through Telegram channels such as LOGSYNC. Because the malware captures whatever is saved in the browser at the time of infection, a single infected device can expose logins to dozens of unrelated accounts at once.

Check If You Are Affected

If you suspect your device may have been infected with stealer malware, or you simply want to know whether your email address shows up in logs like this one, HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records. It takes seconds to see if you are exposed, and it is the fastest way to know which passwords need to change right now.