What Is a Stealer Log? CuckooLogsPublic Telegram Breach Explained

In December 2025, HEROIC identified a massive stealer log file distributed on Telegram under the label "CuckooLogsPublic-20251201," exposing 49,746 records. The file contained plaintext passwords, email addresses, and URLs scraped directly from compromised devices by infostealer malware. With nearly 50,000 victims in this single drop, this is among the larger public stealer log releases seen from Telegram-based threat actors in late 2025.

What makes this breach stand out is the sheer volume and recency. December 2025 data is fresh by any measure — these aren't stale credentials from years ago. Plaintext passwords tied to real session URLs give attackers an actionable map of each victim's online life. The risk of immidiate account takeover is very real for anyone in this dataset.

What CuckooLogsPublic-20251201 uploaded by a Telegram User Leaked: The Full Data Picture

• Email Addresses — used to identify victims and launch targeted attacks across every platform they use
• Plaintext Passwords — fully usable credentials requiring zero additional effort from attackers
• URLs — the exact web pages where passwords were captured, revealing which accounts and services are at risk

Why CuckooLogsPublic-20251201 uploaded by a Telegram User Data Creates Lasting Identity Risk

Being in this breach doesn't just mean one account is at risk. The combination of email, plaintext password, and URL creates compounding danger:

Credential stuffing attacks use automated tools that test stolen login pairs across hundreds of websites simultaneously. Within hours of a breach going live, bots are already probing banking sites, email providers, and social media accounts with your credentials.

Password reuse turns one leak into many. If you've recycled a password across multiple accounts, every one of those accounts is now exposed. Attackers specifically look for high-value reuse patterns across email, banking, and cloud services.

URL data enables precision phishing. Knowing exactly which services you use allows attackers to craft highly convincing fake messages from those exact services, making it far harder to distinguish real communicatons from malicious ones.

How Stealer Log Attacks Harvest Login Data

A stealer log breach begins with infostealer malware — a category of malicious software designed to silently harvest credentials from infected computers. Users most commonly get infected by downloading software from unofficial sources, clicking phishing links, or visiting websites that silently push malicious code onto unpatched browsers.

Once installed, the malware operates invisibily in the background. It intercepts credentials as you type them into login forms, copies saved passwords from your browser, captures session cookies (which can bypass two-factor authentication), and records every URL you visit. This data gets packaged into a log file and sent to the attacker's server. Files like CuckooLogsPublic are then released free on Telegram — sometimes as advertising for paid services, sometimes just for notoriety. Either way, your data ends up in the hands of anyone who wants it.

Search the CuckooLogsPublic-20251201 uploaded by a Telegram User Breach: Check Your Exposure Free

HEROIC has indexed over 400 billion compromised records, including this CuckooLogsPublic Telegram drop and thousands of other stealer log releases. If your email or password appeared here or anywhere else in HEROIC's database, you'll know in seconds. Search free right now — don't wait for an attacker to tell you that you were exposed.