3,132 Youlogs stealer archive passwords exposed in November 2023

HEROIC analysts identified a stealer log archive on November 6, 2023, when a Telegram user shared a file labeled "youlogs 172pcs.rar" in a public channel. The archive contained 3,132 records, each representing a single compromised endpoint from which credentials had been harvested. The leaked data included email addresses, plaintext passwords, and URLs pointing to the services accessed from those endpoints -- primarily API hosts and web applications. The data was presented in the raw, structured format typical of infostealer malware output, with no obfuscation applied to the passwords. Any account in this dataset was immediately at risk of unauthorized access.

Why This Is Dangerous

Plaintext passwords require no additional work from an attacker. Combined with email addresses and a list of service URLs, this archive gave anyone who downloaded it a direct roadmap to compromised accounts. An attacker could see exactly which services each victim used and attempt to log in using the stored credentials without any technical skill. API host URLs in the dataset add an additional layer of risk: some of these credentials may have granted access to backend systems, developer tools, or business infrastructure rather than just consumer accounts. The scale of 3,132 records, while smaller than some stealer collections, represents thousands of real people whose accounts were actively at risk the moment this file was shared on Telegram.

What Was Exposed

• Email addresses
• Plaintext passwords (unencrypted, seperate decryption not required)
• URLs including API host addresses

Why This Matters

Stealer log archives like Youlogs are a primary fuel source for credential stuffing attacks. When attackers load these email-password pairs into automated tools, they can test them against hundreds of popular platforms simultaneously. Password reuse is common, so a credential stolen from one service often works on others, including email providers, banking platforms, and social media accounts. Once an attacker gains access to an email inbox, they can trigger password resets for every other account the victim owns. Identity theft and financial fraud become straightforward from that point. The presence of API host URLs in this dataset also means some victims may have had business or developer accounts compromised, potentially exposing company data beyond just personal accounts.

How Stealer Log Malware Works

Infostealer malware is typically installed on a victim's device through a phishing email, a trojanized software download, or a malicious browser extension. Once installed, it runs silently and begins scanning the device for saved credentials. It reads from browser password managers, application credential stores, and session tokens, then compiles every username, password, and associated URL it finds into a structured log. The log is then transmited to a server the attacker controls, usually within minutes of infection. The attacker packages the logs, often sorted or labeled by category such as cloud services or API hosts, and distributes them through channels like Telegram. The Youlogs archive folowed exactly this pattern: 172 infected devices, each contributing records to the final 3,132-entry collection that was shared publicly in November 2023.

Check If You Are Affected

If your device was active in late 2023 and you had any browser-saved passwords, your credentials may have been captured by infostealer malware and included in archives like Youlogs. HEROIC's free breach scanner searches more than 400 billion exposed records, including stealer log collections from Telegram and dark web sources, to tell you whether your email has been compromised. Run a free search now to see if your data appeared in the Youlogs archive or any related breach.