Upload by LOGSYNC – 1zzxa uploaded by a Telegram User

We've been tracking a steady rise in stealer log deployments across Telegram channels, but what caught our attention this week was the apparent targeting of cloud-based file-sharing services. It wasn't just the volume of credentials, but the specificity of the data contained within a log file posted on **June 17, 2025**, by a Telegram user. The log, seemingly originating from an information stealer campaign, specifically targeted users of **Upload by LOGSYNC**, exposing a trove of sensitive information. This breach stands out because it goes beyond generic credential stuffing; it provides attackers with direct access to potentially sensitive files and data stored on the platform.

Upload by LOGSYNC Breach: 119k Records Exposed Via Telegram Stealer Log

A stealer log file surfaced on Telegram revealed a breach impacting users of Upload by LOGSYNC, a file-sharing service. The discovery occurred after our team identified a new Telegram channel dedicated to the distribution of stealer logs. The volume of logs was already high, but the Upload by LOGSYNC log stood out due to the inclusion of not just credentials, but also API host URLs, suggesting potential access to the platform's infrastructure. This is particularly concerning as it could allow attackers to bypass normal user authentication and directly manipulate data or deploy malicious code within the service.

• Total records exposed: 119,483
• Types of data included: Email Addresses, Plaintext Passwords, URLs
• Sensitive content types: Potentially sensitive documents stored on Upload by LOGSYNC
• Source structure: Stealer log file (format unspecified)
• Leak location(s): Telegram channel
• Date of first appearance: June 17, 2025

The breach highlights the ongoing threat posed by stealer malware, which is increasingly being used to harvest credentials and other sensitive data from compromised systems. The use of Telegram as a distribution platform for these logs underscores the challenges in tracking and mitigating these threats. According to a recent report by BleepingComputer, Telegram channels are becoming a popular hub for threat actors to share and trade stolen data. The report also notes that the ease of access and anonymity offered by Telegram make it a difficult environment to police. The appearance of API host URLs in this leak suggests a higher level of sophistication than simple credential harvesting. It points towards a potential attempt to compromise the Upload by LOGSYNC platform directly, potentially enabling widespread data exfiltration or even ransomware deployment.