We've been tracking a steady increase in the volume of stealer logs appearing on Telegram channels dedicated to initial access and credential stuffing. What really struck us wasn't the overall volume, but the increasing specificity of the target profiles contained within those logs. This particular dump, labeled **"YOULOGS MIX580pcs"**, caught our attention because it contained a diverse set of credentials and URLs pointing to potential API endpoints, suggesting a broader reconnaissance effort than typical password dumps. The data had been circulating quietly since late September, but its implications for enterprise API security warranted a closer look.

YOULOGS MIX580pcs: Stealer Logs Expose Credentials and Potential API Endpoints

This breach involves a stealer log file uploaded to Telegram on September 24, 2023 by an unidentified user. The file, named "YOULOGS MIX580pcs", contained 9,696 records harvested from compromised endpoints. What differentiates this leak from typical stealer logs is the inclusion of not only email addresses and plaintext passwords, but also URLs that appear to be potential API endpoints. This combination suggests the attackers may have been actively probing for vulnerable APIs after gaining initial access via compromised credentials.

The file was discovered by our team while monitoring Telegram channels known for hosting and distributing stolen data. The presence of potential API endpoints alongside standard credentials raised concerns about the possibility of automated API abuse. This type of data is valuable for attackers looking to bypass traditional authentication mechanisms and directly access sensitive data or functionality through APIs.

This incident underscores the growing threat of stealer logs being weaponized for API reconnaissance and abuse. The automation of credential stuffing and API probing, combined with the ease of access to stolen logs on platforms like Telegram, significantly lowers the barrier to entry for attackers targeting enterprise APIs.

Key point: Total records exposed: 9,696

Key point: Types of data included: Email Addresses, Plaintext Passwords, URLs (potential API endpoints)

Key point: Source structure: Stealer log file

Key point: Leak location: Telegram channel

Key point: Date of first appearance: September 24, 2023

The rise of stealer logs on Telegram and similar platforms has been documented by several cybersecurity firms. A report by Kaspersky in Q1 2023 highlighted a significant increase in the number of stealer-infected users, with RedLine Stealer being one of the most prevalent malware families. The ease with which these logs can be acquired and repurposed for various malicious activities makes them a persistent threat to enterprises. Furthermore, discussions on hacking forums and Telegram channels often revolve around techniques for parsing and utilizing stealer logs, demonstrating the active interest in this type of data. One Telegram post claimed the files were "collected from devs testing an AI project".

Email · Addresses · Plaintext · Password · Urls

We've been tracking a steady rise in stealer log dumps appearing on Telegram channels, but what caught our attention with this particular upload was the seemingly targeted nature of the data. It wasn't just a generic collection of credentials; the file, shared on **October 23, 2023**, by a Telegram user, appeared to focus on development-related credentials, potentially exposing internal infrastructure. The file name, **YOULOGS MIX580pcs**, hinted at a broader collection effort, but the contents pointed to a specific set of victims.

The Stealer Log Spill

This breach centers around a stealer log file containing 1708 records, uploaded to Telegram. The exposed data included email addresses, plaintext passwords, and URLs of potentially sensitive endpoints. The file, designated YOULOGS MIX580pcs, suggests a compilation of logs from multiple compromised systems. This incident is particularly concerning due to the presence of plaintext passwords, a practice that amplifies the risk of credential stuffing attacks and unauthorized access to other systems. The fact that these logs were found on Telegram, a platform increasingly used for the distribution of stolen data, highlights the growing threat landscape for enterprises.

Breach Stats:
* Total records exposed: **1708**
* Types of data included: **Email Addresses, Plaintext Passwords, URLs**
* Source structure: **Stealer log**
* Leak location: **Telegram channel**
* Date of first appearance: **October 23, 2023**

External Context

The use of Telegram as a distribution point for stolen data aligns with a broader trend. Cybersecurity firms have noted the increasing popularity of Telegram channels for buying, selling, and sharing compromised credentials and stealer logs. A recent report from Group-IB highlighted the role of Telegram in the initial access broker (IAB) ecosystem. While this specific breach hasn't been widely reported in mainstream media, the broader issue of stealer logs being traded on Telegram is well-documented.

The presence of plaintext passwords is a critical finding. As HaveIBeenPwned creator Troy Hunt has repeatedly emphasized, the continued use of plaintext storage for passwords, even in logs, demonstrates a fundamental lack of security awareness and increases the potential for widespread harm. The combination of exposed URLs and credentials also suggests the potential for supply chain attacks if the compromised endpoints belong to third-party vendors or partners.

Email · Addresses · Plaintext · Password · Urls