SunCloudNew 1299 – 500 LogsFile uploaded by a Telegram User

We noticed a significant influx of compromised credential data appearing on a popular Telegram channel in late September 2025. What struck us as particularly concerning was the consistent format and the presence of plaintext passwords alongside email addresses and API host URLs. This wasn't a typical brute-force or credential stuffing event; the data appeared to be exfiltrated directly from user endpoints, suggesting a more insidious vector of compromise. The sheer volume, while not astronomical, combined with the direct access to sensitive authentication details, warrants immediate attention.

The breach, identified on 28-Sep-2025, originated from a stealer log file uploaded by an anonymous Telegram user. This file contained 19,087 records, each detailing compromised endpoint information, associated email addresses, plaintext passwords, and relevant API host URLs. The source structure points to a malware-based infostealer actively harvesting credentials from infected systems. The implications are severe: attackers could leverage these credentials for unauthorized access to a wide range of services, including email accounts, cloud platforms, and potentially internal enterprise systems if any of the exposed URLs are associated with our infrastructure or services we utilize.

While specific news coverage directly naming "SunCloudNew 1299" is limited, the broader landscape of stealer malware activity remains a constant threat. Research from cybersecurity firms consistently highlights the proliferation of infostealers like RedLine, Vidar, and Raccoon, which are frequently distributed through illicit forums and messaging platforms. The methodology observed in this leak aligns with the typical output of such malware, underscoring the persistent risk of credential harvesting campaigns targeting end-users and, by extension, their corporate access.