Dark Web Intel: 20,840 Credentials From the ARCEUSULP Dump

HEROIC analysts identified a combolist labeled ARCEUSULP 170 56431 uploaded to a Telegram channel on 20 June 2026. The file contained 20,840 records pairing email addresses with plaintext passwords, along with associated URLs for the accounts involved.

Why This Is Dangerous

Because the passwords in this dump are stored in plaintext, they can be read and used the moment someone opens the file, with no cracking or technical effort required. Anyone who obtains this list can immediately attempt to log into any of the 20,840 accounts it contains.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs

Why This Matters

A dump of this size gives attackers over 20,000 working logins to test. Automated credential stuffing tools can run through all 20,840 pairs against banking, email, and social media sites, hunting for reused passwords. If any of these accounts share a password with an account you use today, that account could be exposed to takeover, fraud, or identity theft.

How Combolists Work

A combolist pairs email addresses or usernames with matching passwords in a simple text file, one record per line. Rather than being harvested fresh from an infected device, a combolist like ARCEUSULP 170 56431 is typically compiled from earlier leaks or scraped credentials, then repackaged and circulated on Telegram channels and dark web forums. Its simple structure makes it easy for criminals to load directly into automated attack tools.

Check If You Are Affected

With over 20,000 records involved, there is a real chance your credentials could be among them, especially if you have reused a password across multiple accounts. HEROIC's free breach scanner checks your email address against more than 400 billion leaked records, including dumps like ARCEUSULP 170 56431, so you can find out quickly and update any passwords that may be compromised.