Researchers Link the 1 390 Telegram Dump to 4.3M Stolen Credentials in 2026

HEROIC analysts identified a stealer log dataset uploaded by a Telegram user in February 2026 that exposed 4,358,508 records. The file, distributed under the label 1 390, contained email addresses, plaintext passwords, and URLs harvested from infected endpoint devices. With over 4.3 million credential sets in a single upload, this ranks among the larger individual stealer log drops observed on Telegram and provides immediate operational value to any threat actor who accessed the channel.

Why the 1 390 Telegram Stealer Log Represents a Large-Scale Credential Threat

The volume of this breach -- over four million records -- makes it a preferred source for large-scale credential stuffing campaigns. Each record in this dataset contains a plaintext password, an email address, and the specific URL of the service where the credential was captured. This combination eliminates every step between data acquisition and account compromise. Attackers do not need to crack anything -- they load the dataset into automation tools and let bots do the rest, testing millions of accounts within hours of obtaning the file.

Data Exposed in the 1 390 Telegram Stealer Log Breach

The following categories of data were confirmed present in this dataset:

• Email Addresses -- account identifiers and universal recovery contacts across all online services
• Plaintext Passwords -- unencrypted, immediately usable login credentials with no decryption needed
• URLs -- the precise services and websites where each stolen credential was captured and remains valid

Account Takeover, Identity Theft, and Financial Fraud at Scale

A dataset of 4.3 million records enables attacks at industrial scale across multiple attack vectors:

• Credential stuffing -- automated tools test millions of email and password pairs against banking, retail, and social platforms concurrently
• Account takeover -- URL-tagged credentials mean attackers target the exact right service every time, maximizing success rates
• Identity theft -- breached email access provides a skeleton key for reseting passwords across every linked account
• Financial fraud -- financial service URLs in the dataset open direct paths to banking accounts and payment platforms
• Bulk resale -- datasets of this size command premium prices on dark web markets, extending the breach impact across multiple buyer communities

How Researchers Track Telegram Stealer Log Operations Like 1 390

Security researchers monitor Telegram channels that distribute stealer log datasets as part of ongoing threat intelligence operations. These channels operate openly on Telegram, where moderation is minimal and operator anonymity is easily maintained. The 1 390 label is consistent with how Telegram log resellers name uploads -- using record counts, dates, or internal batch numbers to communicate dataset size and freshness to buyers. Infostealer malware producing these logs is typically deployed through drive-by downloads, pirated software, and targeted phishing campaigns. The malware silently harvests browser-stored credentials, active session data, and keylogged logins before packaging the data and exfiltrating it to infrastructure controled by the operator. The resulting logs are sorted and batched for resale or free distribution, with uploads of this size typically indicating a large multi-source aggregation rather than a single infection campaign.

Check If Your Credentials Appear in the 1 390 Telegram Dump

HEROIC's free breach scanner searches your email address against more than 400 billion compromised records, including large stealer log collections like this one. If your data appeared in the 1 390 Telegram upload or any related dataset, you will see immediate results so you can change passwords and secure your accounts before attackers do. Scan for free at heroic.com -- it takes seconds and protects every account linked to your email.