Upload_by_LOGSYNC_WATERCLOUD_INFO_308_FILES_15_06_2025_THANKS uploaded by a Telegram User

We're observing a steady increase in targeted credential harvesting via stealer logs circulating on Telegram, often masquerading as legitimate software or updates. Our team identified this particular instance while monitoring a known Telegram channel frequented by initial access brokers. What really struck us wasn't the number of records, but the specificity of the targets and the inclusion of API keys alongside standard credentials, suggesting a focus on automated access rather than simple account takeover. The file name itself, "Upload_by_LOGSYNC_WATERCLOUD_INFO_308_FILES_15_06_2025_THANKS", seemed designed to both mimic a legitimate log file and acknowledge the leaker, a common practice in these communities.

The "LOGSYNC_WATERCLOUD" Leak: 14,702 Exposed Credentials and Endpoints

A Telegram user uploaded a stealer log file on June 15, 2025, containing 14,702 records. This file, which we discovered through proactive monitoring of Telegram channels, appeared to be the result of malware targeting specific software, potentially related to cloud infrastructure management. The data included a mix of email addresses, plaintext passwords, and crucially, URLs pointing to internal endpoints. This combination suggests the attackers were aiming for more than just user accounts, potentially targeting internal systems and APIs.

The breach caught our attention due to the presence of API host URLs alongside traditional credentials. This indicates a shift towards automating access to sensitive systems. Stealer logs are typically associated with opportunistic attacks, but the inclusion of these URLs suggests a more targeted and sophisticated campaign. The file name, while seemingly random, implies the leaker was either directly involved in the data exfiltration or acting as a distributor for the stolen information.

This breach is relevant to enterprises because it highlights the growing threat of stealer logs being used to compromise not just individual user accounts, but entire systems. The presence of API keys within the leaked data significantly increases the risk of unauthorized access and data exfiltration. This also underscores the importance of monitoring Telegram and other similar platforms for leaked credentials and potential threats.

• Total records exposed: 14,702
• Types of data included: Email Addresses, Plaintext Passwords, URLs
• Sensitive content types: API host URLs, potentially leading to internal systems.
• Source structure: Stealer log file.
• Leak location(s): Telegram channel.
• Date of first appearance: June 15, 2025.

External Context & Supporting Evidence

The rise of stealer logs on Telegram has been noted by security researchers. BleepingComputer has reported on similar instances of stealer logs being sold and distributed on Telegram channels, often targeting specific industries. These logs are frequently the result of commodity malware infections, but the presence of targeted data, such as API keys, indicates a growing trend of attackers customizing their malware to target specific systems.

One Telegram post related to similar stealer log dumps claimed the files were "collected from devs testing an AI project." While the veracity of such claims is difficult to ascertain, it illustrates the potential for these logs to originate from compromised development environments or staging servers, further highlighting the risk to enterprises.