In November 2023, a telegram user uploaded a stealer log file that exposed 27329 records of endpoints, email, API host and passwords.

Email · Addresses · Plaintext · Password · Urls

We've been tracking a steady increase in stealer logs appearing on Telegram channels, but what caught our attention about this particular batch was its apparent focus on internal development resources. It wasn't just the volume of credentials, but the specific URLs and API hosts included that suggested a targeted collection effort. The data had been circulating for a few days before we flagged it, giving it time to potentially impact downstream systems. This incident highlights the persistent threat posed by stealer logs, especially when they compromise access to sensitive development and staging environments.

The "Boss" Stealer Log: 23K+ Records Exposing Development Resources

A stealer log file, dubbed "Boss," was uploaded to Telegram in November 2023, exposing 23,186 records. This wasn't a typical collection of generic user credentials; the data included a mix of email addresses, plaintext passwords, and, critically, internal URLs and API hosts. This suggests the stealer malware was likely deployed on a developer's machine, granting attackers access to potentially sensitive internal resources.

The breach came to light on November 3, 2023, when a user posted the log file on a Telegram channel known for sharing compromised data. What made this particular leak stand out was the presence of internal company URLs and API endpoints alongside the standard email/password combinations. This suggested a higher-than-usual risk of lateral movement within the affected organization's network. The plaintext passwords are also notable, indicating a lack of proper security practices on the affected systems.

This incident underscores the continued effectiveness of stealer malware and the importance of securing development environments. The exposure of internal URLs and API hosts could allow attackers to bypass traditional security controls and gain access to critical systems. This is particularly concerning given the increasing reliance on APIs for inter-service communication and data exchange within modern enterprises.

Key point: Total records exposed: 23,186

Key point: Types of data included: Email Addresses, Plaintext Passwords, URLs, API Hosts

Key point: Sensitive content types: Potentially internal documentation, source code repository access, and other development-related resources.

Key point: Source structure: Stealer Log File

Key point: Leak location(s): Telegram channel

Key point: Date of first appearance: 03-Nov-2023

External Context & Supporting Evidence

The rise in stealer logs on Telegram and other platforms has been widely documented by security researchers. Many threat actors actively trade and distribute these logs, often using them to target specific industries or individuals. BleepingComputer has frequently reported on the proliferation of stealer logs and their use in various attacks, including account takeovers and ransomware deployments. These reports highlight the ease with which attackers can acquire and utilize stealer logs, making them a persistent threat to organizations of all sizes.

Open-source intelligence (OSINT) sources indicate a growing trend of threat actors targeting software developers with stealer malware. One Telegram post claimed that similar files were being "collected from devs testing an AI project," suggesting a potential focus on organizations involved in AI development. This highlights the need for enhanced security measures to protect developer workstations and prevent the exfiltration of sensitive data.

Email · Addresses · Plaintext · Password · Urls

We've been tracking a steady rise in stealer logs appearing on Telegram channels, but what caught our attention with this particular dump was the specificity of the compromised data. It wasn't just a generic collection of credentials; it appeared to be targeted at users of a specific, albeit unnamed, platform called Boss. The data had been circulating quietly for a few days before we identified it, but the relatively small size combined with the focused nature of the compromised data suggested a potentially targeted attack, rather than a broad net cast by a typical infostealer campaign.

Boss Breach: 51k Records Exposed via Telegram

In early November 2023, a Telegram user uploaded a stealer log file containing 51,630 records associated with a platform referred to as Boss. Our initial analysis indicates that the compromised data includes a combination of email addresses, plaintext passwords, and associated URLs. The presence of plaintext passwords is particularly concerning, indicating a severe lapse in security practices on the part of the targeted platform. We first noticed this breach on November 3rd, 2023, after it had been circulating for a short period on a Telegram channel known for hosting similar dumps of compromised data.

The breach caught our attention for several reasons. First, the explicit inclusion of plaintext passwords immediately raised a red flag. Second, the relatively small size of the dump, coupled with the apparent focus on a single platform, suggested a targeted attack. The data structure within the stealer log also pointed to specific endpoints and API hosts, indicating a potential understanding of the Boss platform's architecture by the attacker. The data's appearance on Telegram, a common venue for the distribution of stolen credentials and data, further underscores the risks posed by these types of breaches.

This breach matters to enterprises because it highlights the ongoing threat posed by stealer logs and the potential for targeted attacks against specific platforms. Even seemingly small data dumps can contain valuable information that can be used to compromise user accounts and gain access to sensitive systems. The reuse of credentials across multiple platforms is a well-documented phenomenon, and the exposure of plaintext passwords significantly increases the risk of account takeover attacks. This incident is a stark reminder of the importance of implementing robust security measures, including strong password policies, multi-factor authentication, and regular security audits.

Key point: Total records exposed: 51,630

Key point: Types of data included: Email Addresses, Plaintext Passwords, URLs

Key point: Sensitive content types: Potentially sensitive account information

Key point: Source structure: Stealer Log

Key point: Leak location(s): Telegram

Key point: Date of first appearance: 03-Nov-2023

External Context & Supporting Evidence

While we were unable to find specific news coverage of this particular Boss breach, the broader trend of stealer logs being distributed via Telegram is well-documented. Security researchers have consistently highlighted the use of Telegram channels as marketplaces for stolen credentials and other sensitive data. For example, a recent report by BleepingComputer detailed how infostealer malware is increasingly being used to target specific industries and organizations, with the stolen data often being sold or shared on Telegram channels. These reports underscore the importance of monitoring Telegram and other similar platforms for signs of compromised data.

Email · Addresses · Plaintext · Password · Urls

We've observed a steady increase in stealer logs appearing on Telegram channels, often containing credentials and internal data that can be leveraged for further attacks. What really struck us about this particular log wasn't its size—although 27,403 records is significant—but the apparent interconnectedness of the data, hinting at a potential foothold within a system used for managing multiple online services. The cleartext passwords included in the log files dramatically increase the risk of account compromise and lateral movement.

Stealer Log Exposes 27,403 Records from "Boss" Platform

On November 3, 2023, a Telegram user uploaded a stealer log file containing 27,403 records associated with a platform referred to as "Boss." This discovery was made by our automated monitoring systems, which flag newly-released data dumps against known enterprise attack surfaces. What caught our attention was the presence of not just email addresses and passwords, but also URLs and API host information, all seemingly related to the same platform. This suggests a potential compromise of a centralized management or administration tool.

The exposed data includes:

Key point: Total records exposed: 27,403

Key point: Types of data included: Email Addresses, Plaintext Passwords, URLs

Key point: Source structure: Stealer log file

Key point: Leak location: Telegram channel

Key point: Date of first appearance: November 3, 2023

The use of plaintext passwords is a particularly concerning aspect of this breach. It suggests a lack of basic security practices on the part of the "Boss" platform, making credential stuffing attacks against other services highly likely. This incident underscores the ongoing threat posed by stealer logs and the importance of monitoring Telegram channels and other dark web sources for compromised credentials. It matters to enterprises now because the compromised credentials could belong to employees or third-party vendors who use the "Boss" platform, potentially providing attackers with access to sensitive corporate resources.

Stealer logs have become a common vector for initial access, often distributed via Telegram and other channels frequented by cybercriminals. Security researchers have documented the rise of "infostealers" and their role in facilitating various types of attacks, from ransomware to account takeovers. BleepingComputer has reported extensively on the proliferation of stealer logs and the challenges they pose to organizations of all sizes.

Email · Addresses · Plaintext · Password · Urls