SunCloudNew 1122 – 6250 LogsFile.part12 uploaded by a Telegram User

We noticed an unusual surge in traffic originating from a compromised endpoint, which ultimately led us to a Telegram channel where a stealer log file, identified as "SunCloudNew 1122 – 6250 LogsFile.part12," was uploaded on February 24, 2026. What struck us was the relatively small, yet highly sensitive, nature of the data exposed, suggesting a targeted or opportunistic grab rather than a broad data dump. The presence of plaintext passwords alongside email addresses and associated URLs immediately flagged this as a critical incident requiring swift analysis and containment.

The breach originated from a stealer malware infection on an endpoint, capturing credentials and session information. The log file, uploaded by an anonymous Telegram user, contained 99 distinct records. Each record comprised an email address, a plaintext password, and a URL, likely representing the target service or application. This combination of data is particularly concerning as it allows for direct account takeovers and facilitates further lateral movement within the environment or across other services where the same credentials might be reused. The source structure of the leak indicates a direct exfiltration of compromised session data rather than a database dump, highlighting the effectiveness of credential-stealing malware.

While this specific incident is not yet widely reported in public news, the methodology aligns with persistent threats observed in the wild. Threat intelligence reports from firms like Mandiant and CrowdStrike have consistently highlighted the increasing sophistication and prevalence of infostealer malware campaigns targeting enterprise credentials. The tactic of using encrypted messaging platforms like Telegram for exfiltration and distribution of stolen data is a well-documented trend, allowing threat actors to operate with a degree of anonymity and speed. The exposure of plaintext passwords, even for a small number of users, underscores the ongoing vulnerability of organizations to credential stuffing and phishing attacks that leverage such leaked information.