One Telegram Upload. 23,186 Records. The Boss All Stealer Log Exposed Plaintext Passwords and API Endpoints.

HEROIC analysts identified a verified stealer log file uploaded to Telegram on November 3, 2023, exposing 23,186 records. The dataset, referred to as "Boss All," contained email addresses, plaintext passwords, URLs, and API host endpoints, suggesting the malware ran on machines with access to development or internal business resources. Unlike generic combolists, stealer logs like this one carry richer context: they show not just what credentials were stolen, but what systems those credentials open. This breach was recieved and indexed by HEROIC's threat intelligence pipeline shortly after it surfaced in Telegram channels.

Why Plaintext Passwords and API Endpoints Are a Severe Combination

When an attacker has both a plaintext password and the URL or API endpoint it unlocks, they don't need to guess anything. They can make a direct authenticated request to the target system. In a typical breach, attackers have to crack hashes and guess where those credentials are used. With the Boss All stealer log, that work was already done by the malware. API endpoints in particular can expose internal services, developer tools, staging environments, and data pipelines that are not visible to the public. A single compromised developer credential can cascade into access to source code, customer data, or cloud infrastructure.

What Was Exposed in the Boss All Stealer Log

• Email addresses
• Plaintext passwords
• URLs
• API host endpoints

A total of 23,186 records were included in the dataset. The file was uploaded to a public Telegram channel on November 3, 2023, where it was accessible to any threat actor monitoring that channel. The presence of API hosts alongside email-password pairs is a strong indicator that at least some victims had developer or administrator-level access.

How Stealer Logs Enable Credential Stuffing and Account Takeover

Stealer logs feed directly into the credential stuffing ecosystem. Once a log file is posted to Telegram, automated tools ingest the email-password pairs and begin testing them across major platforms: email providers, cloud services, banking apps, and social media. Because the Boss All log contained plaintext passwords, the testing phase is near-instant. Victims whose credentials appear in this log are at immediate risk of account takeover across every service where they reused the same password. Identity theft and financial fraud are common downstream outcomes, often occuring within hours of a fresh log being posted.

How Stealer Malware Harvests Credentials Like These

Information-stealing malware is typically delivered through phishing links, fake software installers, or trojanized tools. Once active on a machine, it silently extracts saved browser passwords, autofill data, session cookies, and credentials stored by applications. It also captures active URLs and API tokens from browser history and application memory. All of this is packaged into a structured log file and uploaded to a Telegram channel or a remote server controlled by the attacker. The entire process can happen within minutes of infection, and the victim usualy has no idea their machine was compromised until accounts start showing unusual activity.

Check If Your Email Appeared in the Boss All Leak

HEROIC's breach intelligence database contains over 400 billion records, including stealer logs, combolists, and database dumps from across the dark web and Telegram. You can search your email address for free using HEROIC's breach scanner to see if your credentials were included in the Boss All upload or any other known breach. If your data is found, immediately change the affected passwords, revoke API keys or tokens associated with that account, and enable two-factor authentication on all connected services. Do not delay: plaintext credentials in active stealer logs are exploited quickly.