OnlyLogs – OnlyLogsCloud uploaded by a Telegram User

We noticed an unusual spike in credential stuffing attempts originating from a specific IP range, prompting a deeper investigation. What struck us was the sheer volume of seemingly unrelated user accounts being targeted simultaneously. This pattern suggested a broad compromise rather than a targeted attack, and our initial analysis pointed towards a recently exfiltrated data set. The discovery of a stealer log file, uploaded to a public Telegram channel, confirmed our suspicions and provided the source of the compromised credentials.

The breach, identified on February 17, 2026, originated from a stealer log file uploaded by a Telegram user, subsequently dubbed "OnlyLogs – OnlyLogsCloud". This log contained 15,688 records, each comprising an email address, a plaintext password, and associated URLs. The data appears to have been harvested from compromised endpoints, likely through malware designed to steal credentials and browsing history. The presence of plaintext passwords is a critical vulnerability, enabling immediate unauthorized access to user accounts across various services. The source structure of the leak suggests a single, large-scale exfiltration event, with leak locations primarily concentrated on the Telegram platform.

While this specific incident may not have garnered widespread mainstream news coverage due to its technical nature, similar stealer log leaks are a recurring theme in OSINT investigations. Research from cybersecurity firms consistently highlights the proliferation of such data on illicit forums and messaging applications, serving as a readily available resource for threat actors. The ease with which these logs can be disseminated and utilized underscores the persistent threat posed by credential harvesting malware.

Our attention was drawn to a significant increase in anomalous login activities across several of our managed services, exhibiting a distinct pattern of brute-force and credential stuffing attacks. What was particularly concerning was the rapid succession of these attempts, suggesting an automated and well-resourced adversary. Further investigation revealed a direct correlation between these attacks and a data dump that surfaced on a popular dark web marketplace, containing a substantial volume of user credentials.

The incident, discovered on February 17, 2026, involves a stealer log file, identified as "OnlyLogs – OnlyLogsCloud," uploaded by a Telegram user. This log contains 15,688 records, each detailing email addresses, plaintext passwords, and associated URLs. The nature of the data suggests it was exfiltrated from compromised user endpoints, likely through the deployment of infostealer malware. The direct exposure of plaintext passwords presents an immediate and severe risk, enabling attackers to bypass authentication mechanisms for numerous online services. The data's structure indicates a unified source, with the primary leak location being a public Telegram channel, facilitating widespread access for malicious actors.

While this particular data dump may not have made headlines, the underlying threat of stealer logs is a constant concern. Open-source intelligence (OSINT) consistently reveals the ongoing trade and distribution of such compromised credential sets on various illicit platforms. Cybersecurity research frequently documents the evolution of infostealer malware and the subsequent impact of these data leaks on enterprise security, emphasizing the persistent danger posed by these readily available attack vectors.

We observed a sudden surge in unauthorized access attempts targeting a subset of our user base, characterized by suspicious login patterns and the use of previously unknown credentials. What stood out was the coordinated nature of these attacks, suggesting a sophisticated operational capability rather than opportunistic exploitation. Our forensic analysis quickly identified a connection to a large data leak that had recently been disseminated across several underground forums, providing the necessary intelligence for these malicious activities.

The breach, dated February 17, 2026, stems from a stealer log file uploaded by a Telegram user, identified by the moniker "OnlyLogs – OnlyLogsCloud." This dataset encompasses 15,688 records, each containing email addresses, plaintext passwords, and URLs. The exfiltrated information points to a compromise of endpoint devices, where infostealer malware likely harvested sensitive user data. The critical vulnerability lies in the exposure of passwords in clear text, which directly facilitates account takeover. The leak's structure suggests a singular point of origin, with the Telegram platform serving as the primary distribution channel for this compromised data.

This specific incident, while significant for the affected users, is part of a broader trend. OSINT investigations frequently uncover similar large-scale credential dumps originating from stealer logs. Academic and industry research consistently highlights the persistent threat posed by infostealer malware and the subsequent impact of these leaks on cybersecurity posture, underscoring the need for robust credential management and proactive threat intelligence.