optonline.net Stealer Log Put 13,465 Stolen Email Pairs Online

HEROIC analysts identified this stealer log on 18-Jun-2026. The breach exposed 13,465 records, with stolen data including email addresses, plaintext passwords, and URLs. The source is identified as optonline.net.

Why This Is Dangerous

Optimum Online (optonline.net) is a major internet service provider, meaning the 13,465 accounts exposed here are primary email addresses for thousands of households. Email accounts are the master key to digital life: password resets, banking alerts, and account verifications all flow through email. With direct access to these inboxes, attackers can intercept communications, take over linked accounts, and conduct highly targeted phishing against the account holders and their contacts.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs (websites where credentials were used)

Why This Matters

ISP email accounts are often decades old and tied to financial institutions, medical portals, and government services. A compromised optonline.net account gives attackers a trusted identity they can weaponize for fraud, identity theft, and social engineering attacks on the victim's bank or healthcare provider. With 13,465 accounts exposed, the scale of potential damage is substantial.

How a Stealer Log Works

A stealer log is created when malware silently runs on a victim's device. The malware records keystrokes, scrapes browser-saved passwords, and captures session cookies as the user browses. This data is compiled into a log and uploaded to attacker-controlled servers. Victims typically have no warning. The first sign of compromise is often an unauthorized login or a locked account.

Check If You Are Affected

HEROIC offers a free breach scanner that searches 400 billion records. Search your email address now to see if your credentials appear here or elsewhere. Free, takes seconds.