The 123123 Log Means Someone Could Be Logging Into Your Accounts

In June 2023, HEROIC analysts identified a stealer log circulating on Telegram under the name 123123. Uploaded by an anonymous Telegram user, this log contains 6,281 records, each pairing an email address with a plaintext password and the URL of the associated service. The name 123123 is one of the most commonly used weak passwords on the internet, and using it as a log title signals the brazen nature of whoever packaged and distributed this dataset.

Why the 123123 Stealer Log Is Dangerous

Every record in the 123123 log is immediately usable. Plaintext passwords need no cracking, the email addresses serve as ready-made usernames, and the URLs point attackers directly to the services they can target. With 6,281 pairs available, an attacker running automated tools can attempt thousands of logins across multiple platforms within the time it takes most people to check their morning email. The victims in this log may have no idea their credentials are in circulation.

What Was Exposed in 123123

• Email addresses
• Plaintext passwords
• URLs (the specific sites and services each credential is linked to)

Why This Matters

Stealer log credentials like those in the 123123 dataset fuel account takeover at scale. Automated credential stuffing tools ingest these email and password pairs and test them against dozens of services simultaneously. When a match is found, the attacker gains access to that account instantly. From there, they can reset passwords to lock out the real owner, drain financial accounts, harvest personal information for identity theft, or use the compromised account as a launchpad to attack others. The simplicity of the attack is what makes it so widespread.

How Stealer Logs Like 123123 Work

Infostealer malware is the mechanism behind every record in this log. Infostealers spread through phishing emails that trick users into opening malicious attachments, through fake software downloads, and through compromised websites that push drive-by infections. Once installed on a device, the malware runs invisibly, extracting saved passwords from web browsers, capturing credentials as they are typed into login fields, and logging the URL of each site visited.

The harvested data is compressed, structured, and transmitted to the attacker's infrastructure, then distributed through private Telegram channels. A name like "123123" is a throwaway label, chosen quickly and with little thought, which is itself a sign of how routine and industrialized this type of criminal operation has become. These logs are produced in bulk and distributed widely, often for free, as part of a broader ecosystem of credential trading.

Check If You Are Affected

HEROIC maintains a breach intelligence database of more than 400 billion records, including stealer logs like this one. Run a free scan to see if your email address or credentials appear in the 123123 dataset. If your data is in this log, changing your passwords now, especially on any accounts where you reuse the same login, is the most effective step you can take.