The BananaLogs Stealer Log Data Quietly Appeared on the Dark Web in November 2023

HEROIC analysts discovered the BananaLogs stealer log on November 8, 2023, when a Telegram user uploaded a file containing 2,117 stolen records from compromised devices. The log included plaintext passwords, email addresses, URLs, and API host information -- a combination that gives attackers direct access to both personal accounts and potentially internal infrastructure. Unlike high-profile hacks that make headlines, this kind of stealer log circulates quietly in private Telegram channels, and most victims never recieve any warning that their data was shared.

Why the BananaLogs Leak Is Dangerous

What made the BananaLogs log stand out was not just the credentials it contained -- it was the inclusion of API host information and internal endpoint URLs. That combination suggests the stealer malware ran on a developer's machine or inside a corporate environment. For businesses, that means attackers may have gained a map to internal systems, not just access to one employee's email. Plaintext passwords require zero effort to use, so any attacker who obtained this file could attempt logins immediately across email, banking, and business platforms without any cracking tools.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs (sites and services visited by victims)
• API host information
• Internal endpoint data

Why This Matters

Stealer log data like BananaLogs feeds directly into automated credential stuffing attacks. Once a working credential is confirmed, it is either used for fraud or sold to other criminal actors. The structured nature of this log -- with API hosts and endpoint URLs included alongside passwords -- elevates the risk well beyond a standard password dump. Businesses using shared developer credentials or storing API keys in browsers are especially vulnerable. The fact that this data was distributed freely on Telegram means the barrier to access was essentially zero, and the file was likely downloaded and tested many times before it was ever flagged. It is also worth noting that the small size of the leak makes it easy to overlook in breach monitoring, meaning many affected users may have been missed by other notification services. A seperate scan through HEROIC is strongly recommended.

How Stealer Log Breaches Work

Stealer logs are produced by infostealer malware that runs silently on a victim's device. The malware records every password typed or saved in a browser, logs which websites and apps are accessed, captures session cookies, and harvests API keys and stored credentials. All of this data is transmitted to the attacker and packaged into a log file. The attacker then distributes the file -- sometimes selling it, sometimes giving it away -- through private channels on Telegram or dark web forums. The entire process often occured without any visible sign on the victim's device, meaning infections can go undetected for months. By the time a log like BananaLogs appears publicly, the credentials inside have typically already been tested and exploited.

Check If You Are Affected

HEROIC offers a free scanner that searches through more than 400 billion leaked records -- including stealer logs like BananaLogs -- to tell you if your email address or passwords have been exposed. Because stealer log data is frequently missed by smaller breach notification services, it is worth running a check specifically through HEROIC. Enter your email at HEROIC's free breach scanner to see if your credentials appeared in this breach or any of the hundreds of other data leaks in our database.