The OnlyLogsCloud Leak Put 11,882 Stolen Logins in Criminal Hands

HEROIC analysts tracked a stealer log upload on Telegram dated August 22, 2025 that contained 11,882 records tied to OnlyLogsCloud, a cloud-based log management service. The exposed data included email addresses, plaintext passwords, and URLs pointing to service endpoints and API hosts. While 11,882 records is smaller than some of the mega-dumps that make headlines, the nature of this target is what elevates the risk. A logging platform holds data flowing in from connected systems, which means compromising its credentials can open doors far beyound the platform itself.

Why This Is Dangerous

Plaintext passwords in a stealer log means zero friction for an attacker. There is no hash to crack, no encryption to break. The moment someone downloads this file, they have ready-to-use login credentials for accounts tied to OnlyLogsCloud. For a service that aggregates log data from other systems, that kind of access is particularly serious. An attacker who gains entry to a logging platform may be able to read sensitive operational data, identify vulnerable systems, or tamper with logs to erase evidence of other attacks. This is not a consumer data breach. It is a breach with potential reach into infrastructure.

What Was Exposed

• Email addresses
• Plaintext passwords (no hashing, no encryption)
• Service endpoint URLs
• API host addresses
• 11,882 total credential records from the OnlyLogsCloud environment

Why This Matters

When attackers compromize a logging service, they gain visibility into whatever that service is monitoring. That could mean application errors, access logs, user activity records, or security events from connected systems. Depending on the configuration, a compromised log management account could expose data from dozens of other applications feeding into it. Even if the primary target is small, the blast radius can be much larger. This breach is a reminder that securing your logging and monitoring infrastructure is just as important as securing the applications themselves.

How Stealer Logs Work

Stealer malware is designed to run invisibly on an infected device. Once active, it scans for saved passwords in web browsers, desktop applications, and configuration files, then collects URLs, API keys, and other credentials it finds. All of this data is packed into a log file and transmitted back to the attacker. The attacker then sells or distributes the log, often through Telegram channels dedicated to this kind of data trade. The OnlyLogsCloud log followed this same path: a device was infected, credentials were harvested, and the resulting file was shared publicly on Telegram within weeks of the initial compromise.

Check If You Are Affected

If you used OnlyLogsCloud or suspect your email may appear in this stealer log, check now with HEROIC's free breach scanner. HEROIC monitors over 400 billion breached records, including stealer log data sourced directly from Telegram and dark web channels. A quick search takes under a minute and tells you exactly which breaches have your information. Do not wait for an account takeover to confirm what a free scan can tell you today.