Upload by LOGSYNC – KeyCloud_Free_logs134 uploaded by a Telegram User

We noticed a concerning data leak originating from a stealer log file uploaded to a public repository. The dataset, attributed to a Telegram user and hosted on a platform named "Upload by LOGSYNC – KeyCloud_Free_logs134," surfaced on June 12, 2025. What struck us immediately was the inclusion of plaintext passwords alongside email addresses and associated URLs, a combination that significantly amplifies the risk of credential stuffing and account takeover across multiple services.

The breach, identified as a stealer log, involved a total of 12,877 records. The exposed data comprises email addresses, plaintext passwords, and URLs, likely representing endpoints or API hosts accessed by the compromised systems. The source structure of the leak suggests a direct exfiltration from infected endpoints, with the log file containing the sensitive credentials used to access various online services. The implications are substantial, as attackers can leverage this information to gain unauthorized access to user accounts, potentially leading to further compromise of organizational assets if these credentials are reused.

While this specific incident does not appear to have garnered widespread media attention, the proliferation of stealer logs on public platforms is a well-documented trend in the cyber threat landscape. Security researchers frequently highlight the dangers posed by these readily available caches of stolen credentials. For instance, reports from organizations like Malwarebytes and KrebsOnSecurity have consistently detailed the impact of infostealer malware and the subsequent leakage of compromised account data, underscoring the persistent threat of credential harvesting and its downstream consequences.